346 Lingual Dentition and Anato7ny of 



Onanloniyx felina., Guppy. 



We have received, from Mr. R. J. Lechmere Guppy, spec- 

 imens preserved in glycerine of his Amphibulima {Omalo- 

 nyx) felina, from Trinidad. On examining the jaw and 

 lingual membrane, we find the species to be a true Omalo- 

 nyx, both organs being the same as have been described for 

 that genus. (See Ann. N. Y. Lye. Nat. Hist., X, 203, 0. 

 unguis of Brazil and Guadeloupe.) 



We have already {I.e., p. 204) stated our belief that O. 

 felina, judging from the shell alone, is specifically identical 

 with the Guadeloupe O. unguis. 



liitlioti.^i i'»l>ac<»Isi, Blanford. 



Sometime since Bhmd was indebted to Colonel Jewett for 

 specimens of this interesting species, from one of which he 

 obtained the jaw and lingual membrane. 



Pfeiffer (Nov. Conch., TV, pp. 11 and 12, pi. cxii, figs. 

 1-4) describes and figures Succinea rupicola Bhuiford (sub- 

 genus Lithotis) quoting the name from the catalogue of Dr. 

 Dohrn's collection, remarking that he had no information as 

 to the work in which the subgenus and this, the typical spe- 

 cies,* had been characterized. 



The shell has a certain similarity to that of Succinea but 

 the species does not belong to the Elasmognatha. 



L. rupicola is found on rocks at an elevation of 2,000 feet 

 in the mountains near Bombay. 



The jaw is arcuate, with a depression or excavation at the centre of its 

 upper margin ; scarcely attenuated towards the ends ; cutting edge with a 

 decided median projection; anterior surface with vertical strias, but no 

 trace of ribs. 



The lingual membrane is as usual in the Helicince, the marginal teeth 

 being quadrate, not aculeate. The centrals are long and narrow, with 

 lateral expansions at the lower margin ; the reflected portion has one stout 

 median cusp with a point reaching nearly to the lower margin of the 



* Succinea {Lithotis) iumida was described and figured by Blanford in Journ. Aa. 

 Soc. Bengal, 1870. See also Nov. Coiich., I.e. 



