FAMILY CRYPTOSTOMIDA — SIGARETUS. 153 
FAMILY CRYPTOSTOMID. 
ANIMAL with the eyes at the external base of the tentacles. Marine. Sueuu either external 
or internal, ear-shaped, much depressed, with avery large aperture ; in some genera, 
the shell entirely wanting. No opercle. 
GENUS SIGARETUS. Lamarck. 
Animal oblong, convex above, plane beneath: mantle very large, emarginate in front ; head 
wide, with two conic tentacles. Gills composed of two pectens. Vent and generative 
organ on the anterior right side, that of the male being very voluminous. Shell internal, 
much depressed: aperture large; spire small, flattened, lateral ; lip thin and trenchant ; 
pillar short and spiral. Two lateral muscular impressions. 
SIGARETUS PERSPECTIVUS. 
PLATE VII. FIG. 156. a. 3. 
(STATE COLLECTION.) 
Sigaretus perspectivus. Say, American Conchology, pl. 25. Subsequently Calyptostoma. 
Description. Shell moderately large, ovate-elongate, depressed. Surface with numerous 
impressed transverse slightly undulated lines, which are crossed by revolving strie which be- 
come obsolete beneath. Aperture more than three-fourths of the entire area of the shell. 
Whorls three : spire depressed, smooth, exhibiting the whorls almost to the summit; suture 
distinct, but not deeply impressed. 
Color. Most usually milk-white, sometimes tinged with brown ; within smooth and polished, 
and faintly iridescent. 
Length, 0°9-1°5; of aperture, 0°7-0°9. 
This is a southern species, as far as I can learn; not having been as yet found to the north 
of the coast of this State. It is not unfrequent on the seacoast of Long island, near Rock- 
away. 
(EXTRA-LIMITAL.) 
S. haliotoideus. (Govup, Invert. Mass. p. 244, fig. 158. S. oxinoe, Cournovy.) Shell small, ob- 
liquely ovate, pellucid, white, compressed, smooth: aperture very large; whorls two. Length, 
0°5: width, 0-4. Stomachs of fishes. Coast of Massachusetls and Europe. 
S. maculatus. (Say, Am. Conch. pl. 25.) Shell with numerous transverse hardly undulated im- 
pressed lines and longitudinal wrinkles: spire hardly proimnent, slightly convex; whorls about 
three; suture a simple impressed line. Color, whitish, with two bands of pale rufous spots, and a 
rufous band near the suture: smaller than the preceding. Southern Coast. 
Fauna — Parr 6, 20 
