204 THE CHICAGO ACADEMY OF SCIENCES. 
Animal: (Fig. 79.) With a short, stout foot, which is 
divided into two portions, the anterior with the head and ten- 
tacles, and the posterior with the balance of the body; anterior 
portion bilobed and projecting, when the animal is in motion, 
in front of the head proper; body colorless; tentacles about a 
third the length of the foot, cylindrical, obtuse, with the eyes 
placed near the base of the tentacles, on the back. Genitalia? 
Jaw arched, with no ribs or denticulations, Radula with rows 
of teeth ina slightly bent series; the central tooth is narrow, 
equilateral and unicuspid, the laterals broad, short, and den- 
ticulated. Animal terrestrial. 
x 
Fig. 79. 
CARYCHIUM EXIGUUM Say. (Binney, Fig. 9.) Animal showing head 
and lower surface of foot. ; 
Distribution: United States, Europe and Africa. 
KEY TO SPECIES OF CARYCHIUM. 
a. Shell cylindrical, aperture over one-third of total length, 
whorls four dnd one-half ic'sjyo 62, canlee fe + tad na ohare exiguum 
b. Shell elongated, aperture one-third of the total length, 
whorls “ive and’one-half& /.8s1 9. eo ae ete oe eee exile 
102. Carychium exiguum Say, pl. xxvi, Fig. 4. 
Pupa exigua SAY, Journ. Phil. Acad., Vol. II, p. 375, 1822. 
Carychium existelium BOURGUIGNAT, Mag. de Zodl., p. 220, 1857. 
Carychium eupheum BOURGUIGNAT, l. ¢c., p. 221, 1857. 
Carychium exiguum mexicanum PILSBRY, Proc. Phil. Acad., p. 319, 
pl. xiv, Figs. 7, 8, 9, 1891. (Variety.) 
Shell; Cylindrical, pupiform, translucent, spire long and 
conic; color pearly white, surface shining, somewhat pol- 
ished, lines of growth numerous, crowded, minute; whorls four 
and one-half, regularly increasing, convex, somewhat oblique 
in position; spire very long, conic, less than two-thirds the 
length of the entire shell; apex obtuse; sutures very deeply 
impressed, making quite a perceptible v-shaped depression 
between the whorls; base of shell rounded, exhibiting a round 
and deep umbilicus; aperture ovate, rounded below, narrowed 
at the upper part, more than one-third the total length; parietal 
wall with a large plait midway between the terminations of the 
peristome; there is a somewhat prominent callosity on the base 
YAS Sar ae ee ae 
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