THE NATURAL HISTORY SURVEY. 149 
and five or six narrow bands below and one or two above the 
peripheral band; whorls six, convex, rapidly increasing in size; 
aperture very nearly circular; somewhat contracted by the 
reflected peristome, and showing the bands of color through 
the shell; peristome reflected, very thick, white or pinkish, 
with anobtuse tooth on the base; terminations deflected toward 
each other and connected, in some specimens, by a thin callus; 
the reflection near the columella partly covers the umbilicus; 
umbilicus profound and wide, showing all the volutions to the 
apex, which may be easily perforated; base of shell convex. 
Greater diam., 29.00; lesser, 25.00; height, 15.50; umbilicus, 5.00 mill. (10118.) 
) 
. Se SOs) AO 225.00, eee oe ees © SOK swe Uta 
5 ae OOS >: 2A ob eee re kenod: 2 5.00 “ (7780.) 
< eal 1 2b.oOs ok asoU; Ne C008 = (7729;) 
Animal: Witha long and narrow body; color light brown, 
darker on eye-peduncles and head, uppersurface of foot flecked 
with white; foot thick, long, narrow, acutely pointed behind; 
eye-peduncles long and slender, cylindrical, the black eyes on 
prominences at the tip; tentacles short, cylindrical, blunt; re- 
spiratory orifice large, on the right side under the peristome. 
The heart is plainly seen just below the largest brown band and 
about 5 mill. from the aperture. Anexamination of the pulsa- 
tions of a dozen individuals gave the following data: 70 (3 spec- 
imens), 65 (4 specimens), 62 (3 specimens), 58 (1 specimen), 
56 (1 specimen). The heart beat much slower when the shell 
was held tightly in the hand, and much faster (70) when the 
animal was extended and crawling over the hand. Length of 
foot 41.00 mill., width 10.00 mill. Another specimen gave 57 
by 11 mill. 
Faw: Strongly arched, ends squarely truncated; ten stout 
Fie. 18. 
Jaw of POLYGYRA PROFUNDA Say. (Original.) 
ribs on anterior surface which denticulate both margins of jaw 
(Fig. 18). 
Radula formula: *%§+14*+4+ '4+%9° or *$ +1" +4+ 1" +28 
(40—1—40); central tooth with a squarish base of attachment, 
much expanded on the lower outer edges; reflected portion 
