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

the enamel are prominent. At M

g the trigonid part is heavily worn, the frontal part of the talonid is worn on the average while the hypoconulid is slightly worn. Mgi length 2.5 cm, width + 1.5 cm. According to this worn and damaged specimen we can ascertain that the tooth-elements were lophodont rather than bunodont ones. The trigonid and talonid of the tooth are connected by narrow medial fold while the hypoconulid is separated from the other elements. It is most obvious to compare Sirenia find N V. 60. 685. with the prepared type of Sirenavus hungaricus Kretzoi (KORDOS 1981). The resembling morphology and measurements of MgSuggest relationship. Although the mandible of Sirenavus is narrow and flattened, its alveolar region is strongly bent and widened. The dimension of the diastema between the and processus coronoideus as well as the position of M^, being lingually strongly divergent from the central line the jaw-bone, show further connections. According to this comparison, there are basic similarities between Sirenavus and specimen N V. 60. 685. as regards measurements and anatomical characteristics. On the basis of the measurements of the jaw-bone and the teeth, Eotheroides libycum Andrews, Eotheroides sp. from Baiinka, Prototherium veronense De Zigno and Anisosiren pannonica Kordos can be taken into consideration besides Sirenavus hungaricus Kretzoi (ANDREWS 1906, KORDOS 1978, ABEL 1913, KORDOS 1977, KRETZOI 1941, KORDOS 1981, DOMNING & MORGAN & RAY 1982). However, at present there is no possibility to make a direct comparison with the above-mentioned taxa for lack of the respective anatomical elements. As long as we are unable to make a more exact identification with the aid of new finds, it is advisable to record this Sirenia find under the names Sirenavus or Eotheroides species. REFERENCES ABEL, O. (1913): Die eozänen Sirenen der Mittelmeerregion.-Palaeontogr.

, 59: 289-360. ANDREWS, C.W. (1906): A descriptive catalogue of the Tertiary Vertebrata of the Fayum, Egypt.-British Museum (N. H. ), London, XXXVII + 324 pp. DOMNING, D. P. & MORGAN, G. S. & RAY, CE. (1982): North American Eocene Sea Cows (Mammalia: Sirenia).-Smiths. Contribs. Paleobiol. 52\ 1-69. KORDOS, L. (1 977): Major finds of scattered fossils in the Palaeovertebrate Collection of the Hungarian Geological Institute (Communication No. 4).-Földt. Int. évi jel. 1977: 313-326. KORDOS, L. (1978): Contribution to the knowledge of Sirenians from the Hungarian Eocene.-Földt. Int. évi jel. 1978: 385-397. KORDOS, L. (1981): Some complements to the knowledge of a Middle Eocene Sirenia, Sirenavus hungaricus Kretzoi, 1941,- Fragm. Min. et Pal. H): 75-78. KRETZOI, M. (1941); Sirenavus hungaricus n. g. n. sp. , ein neuer Prorastomide aus dem Mitteleozän (Lutetium) von Felsőgalla in Ungarn.-Annls Hist.-nat. Mus. natn. hung. (Pars Min. Geol. Palaeont. ), 34: 146-156. Author' s address: Dr. László KORDOS Hungarian Geological Institute H-1143 Budapest Népstadion u. 14. Hungary EXPLANATION TO PLATE I Fig. 1. The upper surface of the Nummulites-limestone block with the Sirenia Mg - M3 remains Fig. 2. Side view of the N° V. 60. 685. Sirenia mandible and the trace of the M<

( fragments of the M

2-Mg. Photo: PELLÉRDYNÉ