GASTROPODA. 
163 
genital organs ; id, 1. c. p. 29, pL v. fig. 7. H. (M.) mitchellana (Lea) and 
rcemeri (Pfr.), genital organs ; id. P. Ac. Philad. 1874, p. 40, pis. iii. 
fig. 3, iv. fig. 5. H. {M.) downseana (Bland), jaw and radula; id. 1. c. 
p. 49. H. (if.) wetherhyi, sp. n.. Bland, Ann. Lyc. N. York, x. p. 361, 
Laurel River, Kentucky ; its jaw and radula, Binney, P. Ac. Philad. 
1874, p. 79. H. (if.) mo&t7/awa(Lea), distinct ixom jejuna (Say) ; Bland, 
Ann. Lyc. N. York, x. p. 363. 
Helix, groups Arionta and Lysinoe. J. G. Cooper, P. Cal. Ac. v. pp. 
,121-124, discusses the geographical distribution of the Californian 
species, reducing to two those of -the first group, viz., californiensis 
(Tjoa) and hclletii (Forbes). Both are very variable, becoming more 
elevated and imperforate in cold, foggy localities (ff. vincta and 
nemorivaga being such varieties of the former, and H. tryoni and redi- 
mita of the latter), and more depressed and perforate in warmer 
localities (if. ramentosa, reticulata, and hridgesi being such varieties of 
the first named, and H. creh'istriata, intercisa, and stearnsiana of the 
last species). Of the group Lysinoe, he regards ayresana (Newc.), 
dupetittliouarsi (Yal.),7^c?eZ^s (Gray), mormonum (Pfr.), remondii (Tryon), 
trashi (Newc.), and roioelli (Newc.) as best entitled to specific rank. 
Helix {Arionta) stearnsiana (Gabb), jaw, radula, and genital organs ; 
Binney, Ann. Lyc. N. York, xi. p. 39, pi. vi. fig. 2. H. (A.) trashi 
(Newc.), helletti (Forbes), nickliniana (Lea), and reticulata (Pfr.), genitah 
organs ; id. 1. c. p. 30, pi. vi. fig. 4, and P. Ac. Philad. 1874, pp. 39-41, 
pis. iii. figs. 4 & 2, iv. fig. 2. 
Helix. Species from Central and Southern America : — 
IT. {Fruticicola ?) griseola (Pfr.), radula; Binney, P. Ac. Philad. 1874, 
p. 55, pi. X. fig. 11. 
II. {Leptoloma) fuscocincta (C. B. Ad.), radula ; id. 1. c. p. 58, pi. ix. 
fig. 11. 
H. platystyla (Pfr.) is from Jamaica; Bland, Ann. Lyc. N. York, xi; 
p. 82. 
H. (Coryda) gossii (Pfr.), radula; Binney, 1. c. p. 55, pi. ix. fig. 2. 
H. (Cysticopsis) tumid a (Pfr.), radula ; id. 1. c. p. 56, pi. ix. fig. 1. 
if. (Flagioptycha) sargenii, sp. n.. Bland, Ann. Lyc. N. York, xi. p. 79, 
Little Inagua, Bahama, if. macroglossa (Pfr.), radula ; Binney, 1. c. 
p. 56, pi. X. fig. 10. 
Helix, sub-genus Polymita (Beck), is characterized by the teeth of the 
radula being arranged “ en chevron,” long, subquadrangular, and not 
reflected along its upper margin as usual in the Helicidm, but bearing 
the gouge-shaped expanded cutting edge soldered, as it were, upon its 
surface ; also by the arched, smooth jaw, without median projection. 
H. picta (Born) and muscarum (Lea), probably also sulpliurosa (Morelet) 
^nAversicolor (Born). Bland & Binney, Ann. Lyc. N. York, x. pp. 341 
& 342, pi. xvi. figs. 1 & 2, and P. Ac. Philad. 1874, p. 56. 
Helix, sub-genus Hemitrochus (Swains.), will comprise the rest of the 
West Indian species referred to Polymita, which have the usual dentition 
of the Helicidce, as ascertained in H. varians (Mke.), troscJieli (Pfr.), 
gallopavonis (Yal.), graminicola (C. B. Ad.), and rufoapicata [!] (Poey). lid. 
