AckatineUa and other Pulmonata. 343 



Helix Trosclteli, Pfr. {Ilemitroclms). 



Jaw stout, decicledly 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. 



Aiuplil^iaSiBBBa, (.^saceinea) »i»g>eii<]ieul»ta, Pfr. 



We have already fully described (Ann. Lye. N. H. N. 

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

 jaw, lingual membrane and shell of this species, pointing 

 out its difl'eronces from Succinea, from Pellicula, from Orn- 

 alonyx and all other described genera, but hesitated to decide 

 upon its generic position, leaving it temporarily in Pellicula 

 of Fischer (not of Heynemann which is Omalonyx). 



Being now better acquainted with the jaw of Amjphibulima 

 and tinding that of owv ajppendiculata (believed by us to be the 

 ajppendiculata of Pfciffer) of the same tA'pe, we place the 

 species in Amj)hibuUhia. 



Its lingual dentition more closely resembles that of Sim- 

 pulopsis sulculosa, 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- 

 jndopsis, the jaw of which, according to Shuttleworth, iS' quite 

 different.* 



Fischer bases his genus Pellicula on Succinea depressa, 

 Rang, in the synonymy of which he has S. appendiculata, 

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

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



* See Blaud and Biuaey, Ann. Lye, X, 198. 



