AcJiatinella and other Pulmonata. 343 



Helix Trosc^acli, Pfr. (Ileinitrochns). 



Jaw stout, decidedly arched, liigh, ends attenuated, blunt; a decided, 

 small median projection to cutting edge, a strong transverse line of reiu- 

 lorcement. 



Lingual membrane as usual in the genus. Centrals very long, the re- 

 flected cutting edge greatly produced above and not extending to the base 

 of the plate, side cusps obsolete, median cusp with a short point. Lat- 

 erals like the centrals, but unsymmetrical, the upper portions still more 

 produced. Marginals quadrate, with one large, oblique, rounded, bluntly 

 bifid denticle, and one or two small, blunt, side denticles. The membrane 

 is peculiar in the extension of the centrals and laterals at their upper 

 margin. 



Aiifi]»?Bilb^alii»isi (.§3iccii])esi) appcKadlciilata, Pfr. 



We have already full}'' tlescribed (Ann. Lye. N. H. N. 

 Y., X, 206, pi. ix, f. 2, 6, 9-11) the external appearance, 

 jaw, lingual ineinl)rane and shell of this species, pointing 

 out its differences from Succinea, from Pellicula, from Om- 

 alonyx and all other descril)cd genera, hut hesitated to decide 

 upon its generic position, leaving it temporarily in Pellicula 

 of Fischer (not of Heynemann which is Onialonyx). 



Being now better acquainted with the jaw of Amphibulinia 

 and finding that of owv appendicidata (believed by us to be the 

 oppendicidata of Pfeiffer) of the same type, we place the 

 species in AmjpJiibulima. 



Its lingual dentition more closely resem1)les that of Sim- 

 pulopsis sulcidosa, so far as centrals and perhaps laterals are 

 concerned, but in the marginals, as described in S. sidculosa 

 and S. Portoricensis, the resemblance ceases. 



Moreover A. appendiculata , Pfr. cannot be placed in Sim- 

 pulopsis, the jaw of which, according to Shuttle worth, is quite 

 different.* 



Fischer bases his genus Pellicula on Succinea depressa, 

 Rang, in the synonymy of which he has 8. ap)p)endiculata, 

 Pfr., but the specimens of the latter under our consideration 

 cannot be the same as Fischer's of depressa. His specimens 



*See Blaud and Dinuey, Aun. Lye, X, 198. 



