~ 
226 THE CHICAGO ACADEMY OF SCIENCES. 
provided with swellings at regular intervals, which support a 
number of sharp spines pointing toward the aperture; on the 
columella there is also a smooth, heavy, revolving rib; on * 
the base of the shell, placed far within the aperture, are two 
smooth, heavy lamellz which extend only about a third of a 
volution; the parietal lamellae are more or less granular in 
texture; peristome narrowly reflected, slighty thickened, the 
terminations widely separated; umbilicus narrow, open (Figs. 
58, 59). 
Fig. 58. Fig. 59. 
STROBILOPS LABYRINTHICA Say» STROBILOPS LABYRINTHICA Say. 
showing parietal lamellz. (Binney Parietal lamellz enlarged. (Binney, 
Fig. 282.) Fig. 283.) 
Greater diameter, 2.15; lesser, 2.00; height, 1.50 mill. (11994.) 
“ ss 2.15; ene yA O10} a Lieve s (11994.) 
Animal; Very small; foot rather short, narrow, rounded 
beforefand behind; color white on the foot and sides of body 
and jet black on head, neck and eye-peduncles; the head is 
rather broad and the eye-peduncles are short, very thick and 
J 
Fig. 60. 
Radula of STROBILOPS LABYRINTHICA Say. (Original.) cc, central 
tooth; 1, first lateral; 5, intermediate lateral; 10, fifth marginal; J, jaw. 
bulbous at their end, where the eyes are situated; the tentacles 
are very short and thick. 
Yaw: Long and narrow, somewhat arched, ends blunt; 
= ‘Sate 
x was 
=) oe Ansan 
