206 AMERICAN JOURNAL 



Helix septemvolva, Say. 



Jaw long, narrow, slightly arched ; ends attenuated, bluntly 

 rounded ; anterior surface with seven stout, distant ribs, crenu- 

 lating the cutting edge. 



Lingual membrane long and narrow. Teeth as usual in the 

 genus. Centrals and laterals much longer than broad. Uncini 

 long, stout, irregularly denticulated, as in the last described 

 species. 



Helix Townsendiana, Lea. 



Jaw with numerous stout ribs, visible both on the anterior and 

 posterior surface, and denticulating both upper and lower 

 margin. 



Lingual membrane long and narrow, composed of numerous 

 rows of about 40 — 1 — 40 teeth each. Centrals and laterals as 

 usual in the genus. Uncini long and narrow, irregularly den- 

 ticulated. 



Helix varians, Fer. 



The lingual membrane examined was extracted from a speci- 

 men received from Florida by the Museum of Comparative 

 Zoology. 



Lingual membrane with about 33 — 1 — 33 teeth in each row, ar- 

 ranged as usual in the genus. Teeth also as usual in the genus, 

 the uncini being irregularly denticulated, denticles long and 

 blunt. 



The jaw of this species has already been figured by us, in L. 

 & Fr. W. Sh., Part L, p. 185, fig. 325. 



Helix loricata, Gould. 



Jaw long, broad, slightly arched, ends blunt, but little attenu- 

 ated ; with eleven broad, stout, crowded ribs, visible on both 

 anterior and posterior surface, and crenulating either margin. 



Lingual membrane with teeth like those o^ Helix Townsendiana 

 already described. 



Helix inflecta, Say. 



Jaw thick, short, broad, arched, of almost uniform width quite 

 to the blunt ends ; with fourteen stout, crowded ribs, visible 

 on both anterior and posterior surface and denticulating either 

 margin. 



Lingual membrane with teeth not differing essentially from 

 that of Helix tridejitata, as figured in L. & Fr. W. Shells of N. 

 A., Part I., p. 130. 



Helix redimita, \Y. G. Binn., (Plate 9, fig. 11.) 



Jaw stout, strongly arched, transversely striate in parts ; ends 



