NATURAL SCIENCES OF PHILADELPHIA. 243 
Lingual membrane and jaw as usual in the subgenus,’ the latter 
with over twelve ribs. 
HELIX GERMANA, Gould. (MJesodon.) 
California, Mr. Henry Hemphill. 
Jaw more resembling the type usual in the subgenus Sfenotrema 
than Mesodon, the ribs, eleven in number, being broad and crowded. 
Lingual membrane as usual in Helix. 
There are forms of H. germana closely connecting the species | 
with H. Columbiana, Lea. ‘The jaw of the latter is described by 
Dr. Cooper as strongly arched, with eight broad ribs. 
HELIX GRISEOLA, Pfr. (1ruticicola.) 
Bosque Co., Texas. Mr. Hugo W. Ericsson. 
Jaw with about ten broad, crowded ribs, denticulating the cut- 
ting margin; upper margin with membranous attachment. The 
jaw is somewhat of the type figured by Moquin Tandon for that 
of Helix hispida. (See our fig. 274, p. 159, 1. c.) 
Lingual membrane as usual in the genus Helix. The reflected 
cusps of the teeth are short, stout. Marginals with blunt denti- 
culations. 
Hetrx sEquorcona, J. G. Cooper. (Arionta.) 
Jaw as usual in the subgenus.’ Ribs from four to six. 
Lingual membrane as usual in the subgenus. Central and 
lateral teeth with short, stout cusps. Marginals with two bluntly 
bifid denticles. 
HELIX BXARATA, Pfr. (Arionta.) 
Santa Cruz, California, Mr. Henry Hemphill. 
Lingual membrane and jaw as usual in the subgenus,’ the latter 
with six ribs. 
Hewix Trask, Newcomb. (Arionta.) 
Los Angeles, California, Mr. Henry Hemphill. 
Lingual membrane and jaw as usual in the subgenus,’ the latter 
with eight ribs, five stout, three slight. 
1 See note 1 to p. 242. 
2 In Arionta the jaw is strongly arched, ends blunt; anterior surface with 
a few, stout, distant ribs, projecting far beyond, and deeply scalloping 
either margin. See our figure of that of H. redimita in Am. Journ. of 
Conch. VI. pl. ix. fig. 11. For lingual dentition, see our fig. 284, p. 164, 
of Land and Fresh-water Shells of N. A., I. 
