L. Forró szerk.: Miscellanea Zoologica Hungarica 7. 1992 (Budapest, 1992)

Varga, A.: A new Zonitarion from Western Africa (Mollusca, Urocyclidae)

redly, it is shorter than the penis. The flagellum is wound, only slightly longer than the half length of the epiphallus. The vas deferens is about as long as the epiphallus + flagellum. Spermatophore. - (Holotype: Fig. 6) - The head is slightly shorter than the tail and has a fingerlike projection anteriorly. The tail is helicoidally coiled, the cross-section of its middle part is semi-lunar. The first part of the tail is smooth, the rest behind bears unicuspid spines. Some bicuspid spines appear in the middle. Remarks. - The colour variation of the paratypes: Figs 7, 8, 15, 16, 22, 23. In the smaller sexually mature and juvenile specimens the pigmentation of the foot shows a specific design on the caudal part. Whereas the first part of the foot is almost without pigmentation (it can be feasible also, that it is the consequence of the bleaching effect of the alcohol). In one of the populations (Mbokala Forest) there can be found a dark pigmentband on the frontal part of the mantle border of the juvenile specimens. This is slightly discoloured on the adult specimen (Fig. 7, - marked with an arrow). The genitals present smaller mutations among the paratypes (Figs 10-11, 1213, 18-21, 24). The dimensions of the sack of the bursa copulatrix, the relation between the sack and the stem are varying. The free oviduct is shorter. The male copulatory organ can be cylindrical or club-formed. The smaller specimens are characterized by the club from. The musculus retractor penis is bifurcate in one of the paratypes. One branch is inserted on the caecum, the other on the apex of the sarcobelum (Fig. 11). The spherical caecum which was introduced by the holotype does not always characterize the paratypes, this form can be modified in certain specimens. The flagellum is wound, but in one specimen it is straight (Fig. 10). The papilla of sarcobelum is typical, an exception is shown in Fig. 12, where the top part is squatter. I observed two forms of penis-papillae. An "A-form"; which corresponds to the holotype (Figs 4, 21), and a "B-form" (Figs 12-13, 24), here the umbrellalike part of the papilla bifurcates in a rather complicated manner, its apex flattens out (cross-section: Fig. 13). The ratio between the head and tail changes in the spermatophora of one paratype. The spined part of the tail is slightly shortened (the spines are typical). The fingerlike projection is small in the top of the head-part. Zonitarion lefiniensis sp. n. is well separated from the species known so far by the structure of the male copulatory organ and its particular penial papilla. Derivatio nominis. - Named after the Léfini Reserve, where the specimens were collected. Material. - Types are deposited in the Zoological Department of the Hungarian Natural History Museum, Budapest. Holotype: Congo-Brazzaville, Léfini reservation, Nambouli river, galery forest, 12. 1. 1964. leg. Dr. J. Balogh - Dr. A. Zicsi (A-3255). Paratypes: Léfini reservation, 1. 10. 1964. 4 ex. (8.7; 9; 9.2; 17 mm) (A-3256); 12. 1. 1964. 1 ex. (10.4 mm) (A-3257). Léfini reservation, Mbokala forest 8. 1. 1964. 4 ex. (7; 9; 13.7; 15.4 mm) (A-3258); 10. 1. 1964. 5 ex. (25.6 mm = Figs 7-14; 20 mm = Figs 15-21 mm; 14.1; 14.9; 19.1 mm) (A-3259). Léfini reservation, Nambouli river, galery forest, 7. 1. 1964. 1 ex. (9.7 mm) (A-3260); 12. 1. 1964. 5 ex. (17 mm = Figs 22-24; 11; 13.8; 17.2; 21.5 mm) (A-3261) leg. Dr. J. Balogh - Dr. A. Zicsi.