352 MOLLUSCA. 
Granularly rugose ; colour olive beneath, darker olive above. Length 44, breadth 12 millim. 
Hab. Norru America: on the coast of San Francisco Bay, California 4°. 
E. Nicaracva, several specimens (J. A. McNeil}? *°). 
Binney expressly states * that this is distinct from the preceding species. 
BASOMMATOPHORA. 
Fam, AURICULIDE. 
Shell rather solid, with one or several transverse plaits on the columella. Only one 
pair of feelers; eyes placed behind them. ‘Teeth of the radula in waved rows. 
The great majority of the species of this family are submarine, living exclusively on 
the sea-coast, very near to or even in salt-water; they will be dealt with at the end of 
this volume. Only one genus, the following, is truly terrestrial. 
CARYCHIUM. 
Carychium, O. F. Miller, Verm. Terr. et Fluv. ii. p. 121 (1774); Forbes & Hanley, Hist. Brit. 
Moll. iv. p. 198; Jeffreys, Brit. Conch. i. p. 300; Binney, Land and Freshw. Shells N. Am. 
li. p. 6. 
Very small, white, unicolorous, ovate-oblong; peristome thickened, with revolving 
plait on the columella, and 1-2 teeth on the outer and lower margin. Widely 
distributed in Europe and North America. 
1. Carychium exiguum. : 
Pupa exigua, Say, Journ. Acad. Phil. i. p. 375 (1822)'; Binney, Complete Writings of Say, p. 7’; 
A. Gould, Bost. Journ. Nat. Hist. iii. p. 898, t. 3. fig. 20°. 
Carychium exiguum (Say), Pfr. Monogr. Auric. p. 165‘; Frauenfeld, Verh. zool.-bot. Ges. Wien, iv. 
p- 10, t. 1. fig. 1°; Binney, Land and Freshw. Shells N. Am. ii. p. 6, figg. 5-9 (shell, animal, 
and radula)*; Pilsbry, Proc. Acad. Phil. 1891, p. 319, t. 14. figg. 1-8, and t. 15. fig. 16 (plait)”. 
Hab. Eastern Nortu America: from Maine to S. Carolina and Texas ® 7. 
Var. mexicanum. (Tab. XIX. figg. 15, 16.) 
Carychium exiguum, var. mexicanum, Pilsbry, loc. cit. p. 318, t. 11. figg. 7-9°. 
Somewhat more cylindrical; outer margin of the aperture thick, expanded, with a very obtuse dentiform 
prominence ; lower margin with a still more obtuse faint projection. Long. 1°8, diam. 0°8, apert. 0°7 
millim. Whorls 43. . 
a. Long. 1°8, diam. 0°8; apert. long. 0°7, lat. ? millim. 
b 4, LT, 4, O7; . 0:6, ,, 0°57 
C. » LT, 4 OF; ” 05, ,, 0-54 ” 
a. Dimensions given by Pilsbry ; 6 and ¢. Stoll’s specimens. 
Hab. E. Mexico: Orizaba (/eilprin §). 
W. Guatemata: Hacienda Helvetia, in Upper Cholhuitz, Costa Cuca (Stoll). 
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