306 On Prophysaon^ etc. 



Helix Josepllinse, Fer. {Dentellaria.') 



Guadeloupe. Mr. Schramm. 



Jaw stout, ribless ; so strongly arched as to be quite horse-shoe shai)ecl. 

 Ends bluntly rounded. A decided median projection to cutting edge, 

 marked with strong vertical striae. 



Lingual membrane as in preceding. 



Helix invali<lst, Adams. (Pleurodonta.) 



Jamaica. Mr. Henry Vendryes. 



Jaw not examined. 



Lingual membrane as in the preceding. The centrals and laterals quite 

 short and stout. 



Piinctuiu i»iiiaiti§§iiuuiii, Lea. 



This species was described as Helix minutissima by Mr. 

 Isaac Lea, in 1841. Its proper generic position was un- 

 known, however, prior to 1864, when Professor Edward S. 

 Morse, published figures of the jaw and lingual dentition 

 (Journ. Portland Soc, I, p. 27, fig. 70, pi. viii, fig. 71). 



He thus described the jaw : — 



" The buccal plate (fig. 70) is made up of sixteen long, slender, corneous 

 laminae, recurved at their cutting edges, these plates partially lapping 

 over each other." 



Morse remarked on the similarity between Lea's species 

 and H. pygmosa Drap., of Europe, adding, "and it seems 

 singular that it has never been referred to that species," but 

 after examination of the jaw of the latter, as figured by 

 Moquin-Tandon, Morse considered it generically distinct. 



The following is Moquin-Tandon's description of the jaw 

 of H. pygmo&a (Moll, de France, II, p. 103, pi. x, fig. 2, 

 1855). 



" 3Iachoire large de 0"" .25, peu arqufie, mince, a peine cornee, trans- 

 parente, assez facile a etudier a cause de la transparence des teguments; 

 extremites araincies ; partie moyenne du bord libre un peu surbaissee ; 

 cotes verticales nombreuses, fines, serrees ; creuelures tres petites." 



