Vörös A. szerk.: Fragmenta Mineralogica Et Palaentologica 11. 1983. (Budapest, 1983)

in paradaubentoni with more pronounced paraconule and hypoconule and with strong postprotocrista and premetaconule wing, which are all comparatively weak in janossyi sp. n. In their mandible they are different in the lower coronoid and widened angular processes (

paradaubentoni

), while the 3 cusped 1^ and I2, stronger C, in size more contrasted and tightened small premolars, smaller and shorter P^-Mg teeth and M3 with broader talonid are the distinctive features for paradaubentoni sp. n. against janossyi sp. n. Myotis estramosensis sp. n. Derivatio nominis

: The species name is derived from the half-latinized name of Osztramos Hill. Stratum typicum and locus typicus

: Estramontian horizon of the Middle Pliocene, Osztramos Locality 9, NE Hungary. Diagnosis: A very small Myotis related to the recent _M. mystacinus

, with long premolar-row and small molars. Holotype

: Injured left mandible (Table I, Fig. 8), with alveoli of one-rooted premolars, P4-M0 dentition and complete ascending ramus. Deposited in the Collection of the Palaeontological Department, Hungarian Natural History Museum, Budapest. No. V. 82. 173. Measurements of the holotype: height of mandibular ramus under M^ 1.09, height of coronoid process from basal sinus 2.41, P

4-Mg length 3.75, M^-Mg length 3.12, cross-section length of P4 0.68, cross-section width of P4 0.45, Mi length l.ll, Ml talonid width 0.63, M

2 length 1.09, M

2 talonid width 0.63, Mg length 0.95, Mg trigonid width 0. 57, Mg talonid width 0. 52. Other material and a selected paratype

: 11 mandibular fragments from Locality 9, 1 mandibular fragment from Osztramos Locality 13, some without teeth, I

3

, P^, P

4

, Mi, M

2 and Mg are represented. Selected paratype: right maxillary fragment with M

1-M

3 dentition, from Osztramos Locality 9. Deposited in the Collection of the Palaeontological Department, Hungarian Natural History Museum, Budapest. No V. 82. 177. Measurements of the paratype: height of maxillary bone above M

2 0. 62, M^-M

3 length 2.82, anteroposterior length of M* 1.13, width of M^ between lingualmost and metastylar margins 1.50, width of M-*- between lingualmost and parastylar margins 1.22, antero-posterior length of M

2 1.09, width of M

2 between lingualmost and metastylar margins 1.54, width of M

2 between lingualmost and parastylar margins 1.45, anteroposterior length of M

3 0.68, width of M

3 between lingual and parastylar margins 1.40. Measurements

: for maxillary measurements, see those of the above paratype; minimum and maximum (number of cases: mean in parentheses), height of mandibular ramus under Mi 1. 09-1. 31 (5: 1. 24), height of coronoid process from basal sinus 2.41 (1), CM

3 length 5.4 (1), C-P

4 length 2.18-2.27 (2; 2.23), P4-M3 length 3.75 (1), M1-M3 length 3.12 (1), cross-section length of P3 0,38 (1), cross-section width of Pg 0.31 (1), crosssection length of P

4 0. 63-0. 68 (3: 0. 66), cross-section width of P

4 0. 40-0.45 (3: 0.43), antero-posterior length of Mj 1.11-1.18 (3; 1.16), talonid width of Mi 0. 63-0. 65 (3: 0.64), antero-posterior length of M

2 1.09-1.18 (4; 1.12), talonid width of M

2 0. 63-0. 72 (4: 0. 65), antero-posterior length of M

3 0. 95-1.00 (4: 0. 98), trigonid width of M

3 0. 55-0. 59 (4: 0.57), talonid width of M

g 0. 50-0. 52 (3: 0. 51). Description and comparisons

: First of all, its small measurements prove the distinctness of this new species. No other type-specimen of the similarly aged fossil species shows such small P

4-M3 (3.75 mm) and Mj-Mg (3.12) length. The so far known smallest is the type of M. exilis

. It has P

4-M

3 and M1-M3 values of 4.31 and 3.42 respectively. The means for other species and populations of the small-sized fossil Myoti

s are as follows: for M. janossyi sp. n. 4.19 and 3.50, for M. exilis from Osztramos 4.28 and 3.56, for M. paradaubentoni sp. n. from Osztramos 4.23 and 3.55 are these values, respectively. Among the available recent animals, for 25 M. mystacinus from the Carpathian Basin, the means are 3. 91 and 3.43. The most important differences appear, however, in the relatively lengthened premolar row and the narrow P

4

, Mj, Mg and M3 values of the new fossil species. Unfortunately, in the holotype both one-rooted premolars are missing, but it could be inferred from their alveoli as they stood loosely. In one other fragment the P3 is small and very narrow - absolutely narrower than any of those of the related recent species. The width of P

4 is evidently the smallest as compared with that of the