AchatineUa and other Pulmonata. 341 



We are indebted to our young friend A. Ten Eyck Lan- 

 sing for assistance in the study of this lingual. 



He3'nemann's figure of tlie dentition of Peronia ( OncM- 

 della) is somewhat similar to that described above, at least 

 in the general form and arrangement of the teeth. (Mai. 

 Blatt., 1868, XV, pi. iii, fig. 10.) 



lleli:x i>icta, Born {Polymita). 



A Cuban species. The specimen examined was captured 

 on a 1)unch of bananas in New York by Mr. M. Brandigee, 

 who kindly sent it to Bhmd. 



Jaw (pi. xvi, fig. 1) thick, arched, high, ends bluntly rounded, but 

 little attenuated; anterior surface without ribs; cutting edge without 

 median projection ; a transverse, median line of reinforcement. 



Lingual membrane (pi. xvi, fig. 2) long and broad. Teeth arranged 

 strongly en chevron, of uniform shape on all parts of the membi'ane. 

 Centrals long, narrow, bluntly truncated at top, slightly incurved at sides, 

 rounded and fringed at base, near which is the gouge-shaped, expanded, 

 tricuspid cutting edge. The central cusp is bluntly rounded, the exterior 

 cusps curve outward and are pointed. The lateral teeth are of the 

 same form with the centrals, but are slightly unsymmetrical. There are 

 no distinct marginal teeth. 



By its jaw and lingual membrane, Helix pida is closely 

 allied to Helix muscarum, Lea (see Amer. Journ. of Conch., 

 VI, 204, pi. ix, figs. 4, 16). The last named species is, 

 however, placed by von ISIartens in the subgenus PoJymita 

 and pida in LiocJiiJa. There can be no doubt that both 

 species belong to the same subgenus, but as Helix mu.scarum 

 is the type of Pohjmita, that name must be retained instead 

 of LiocJdla. We anticipate finding the same curious type 

 of lingual dentition in H. sulphurosa, Morel, (which is 

 scarcely distinguishalile from H. pida), also referred to 

 LiocMla by von Martens, but are scarcely prepared to ex- 

 pect it in LiocJiila Jamaicensis, Chem. The latter, which is 

 the type of LiocJiila, will therefore remain undisturbed in 

 its systematic position, unless, indeed, it belongs to Thelid- 

 omus, in which case the name LiochiJa will be placed in the 



