OF CONCHOLOGY. 179 



The first named is the species to which we refer in a foot note 

 to p. 185 of Land and Fr. W. Shells, Part I, as Helix microphysa. 

 The H. disculus, of the same note, proved to be a smooth variety 

 of H. Albersiana, both from Inagua, Bahamas. 



Helix crispata, Pfr. (Eurycratera.) 



Jaw thick, arcuate, ends blunt; anterior surface with ten 

 stout ribs. 



Lingual membrane long and broad; teeth as usual in the 

 genus ; the middle cusp of the centrals and the inner cusp of the 

 laterals produced into a long, acute point ; as the teeth pass off 

 laterally this cusp becomes stouter, shorter and more obtuse ; 

 the extreme marginals are subquaclrate, with one broad, short, 

 emarginate, oblique, inner denticle, and one small obtusely 

 pointed side denticle, hardly projecting beyond the base of the 

 teeth. 



San Domingo. Dr. Newcomb. 

 Helix Isabella, Pfr. (Dentellaria.) 



Jaw stout, arcuate, not very long, high, striated both vertically 

 and transversely, ends but slightly attenuated, blunt, with about 

 eight stout, well defined ribs crenellating either margin. 



Lingual membrane long, narrow. Teeth as usual in the 

 genus; centrals tricuspid, laterals bicuspid; marginals with 

 broad, oblique, stout, usually bluntly bifurcated denticles. 



A specimen from Barbados, received from Governer Rawson, 

 furnished the lingual membrane and jaw here described. 



Helix dentiens, Fer. (Dentellaria.) 



Jaw stout, long, arched, strongly striate transversely, ends 

 slightly attenuated, blunt ; anterior surface with stout ribs (four 

 in one individual, live in another) denticulating both margins. 



Lingual membrane broad. Centrals and laterals as usual in 

 the genus, the reflected cusps being stout and obtusely pointed; 

 marginals with broadly rounded oblique cusps, usually bluntly 

 bifid or trifid, sometimes with small rounded cusps at their sides. 



Dominica. Mr. R. J. Lechmere Guppy. 

 Helix Schroeteriana, Pfr. [Pleurodonta.) 



Lingual membrane long and broad ; teeth as usual in the genus ; 

 centrals and laterals subquadrate, the middle cusp of the former 

 and inner cusp of the latter being stout and long, and bearing a 

 short broad point, the side cusps very slightly developed ; mar- 

 ginals wide and low, with a broad, oblique, long, bluntly tri- 

 cuspid denticle, the middle cusp much the largest. 



Jamaica. Mr. Vendryes. 



