OF CONCHOL«GY. 177 



Helix reticulata, Pfr. (Arionta). 



Jaw stout, strongly arcuate, dark horn color, transversely 

 striate ; ends but slightly attenuated, blunt ; anterior surface 

 with three stout, widely separated ribs, on the central third of 

 the jaw ; their ends projecting beyond either margin. 



Lingual membrane long, wide ; teeth as usual in the genus ; 

 the marginals irregularly denticulated, generally with 4 two 

 oblique, bifurcated denticles. 



California. 

 Helix Nickliniana, Lea. [Arionta.) 



Jaw thick, horn colored, with stout, anterior ribs. 



Lingual membrane very broad ; teeth as usual in the genus, 

 the middle cusp of the centrals and inner cusp of the laterals 

 being very long and pointed, the side cusps of each only slightly 

 developed ; marginal teeth with four or less irregular, long, 

 pointed denticles. 



A large, globose specimen from Mendocino County, Califor- 

 nia, furnished the jaw and lingual membrane here described. 



Helix Gossei, Adams. (Coryda.) 



Lingual membrane broad ; teeth as usual in the genus ; cen- 

 trals and laterals with stout cusps, bearing short, bluntly 

 rounded points ; marginals with one inner, large, bluntly bifid, 

 oblique, long cusp, and one or two small, blunt, rounded cusps 

 at its sides. 



Jamaica. From Messrs. Vendryes and Gloyne. 

 Helix notabilis, Shuttle worth. {Tlielidomus). 



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

 centrals and laterals subquadrate ; marginals subquadrate, with 

 two broad, oblique, blunt, slightly produced denticles, the inner 

 one, as usual, the larger. 



Tortola. Received mounted, from Mr. Robert Swift. 



Helix pemphigodes, Pfr. (Ci/sticopsis.) 



Lingual membrane long and broad ; teeth as usual in the 

 genus, the marginals irregularly denticulated with one or two 

 oblique, long, bluntly bifurcated denticles. 



Cuba. 



Helix loxodon, Pfr. (Plagioptycha). 



Jaw thin, arcAiate, very high, with transverse and perpendicu- 

 lar stride ; ends hardly attenuated, blunt ; cutting edge with a 

 median projection. 



