76 AMERICAN MARINE CONCHOLOGY. 
2. C. costatTum, Verrill. Fig. 136. 
Amer. Journ. Science, 3d ser. iii., 210, 283, t.6, f. 6. 1872. 
C. Cooperi, 8. Smith (not Carpenter), Ann. N. Y. Lyc., ix. 394, f.3. 1870. 
Shell white, moderately curved, solid, with twenty-four rounded 
longitudinal ribs, crossed by numerous rings, rather obscure about 
the middle of the shell, but very distinct at the two extremities, 
where the longitudinal ribs become indistinct. There is a slight 
constriction near the mouth of the shell, which swells out again 
beyond it. Plug mucronate, with the apex inclining to the left; 
operculum concave. 
Length 3, diam. 7 mill. 
New England ; New York. 
Genus SCALARIA, Lamarck. 
Syst. Anim., 88. 1801. 
The animal of the  Wentle-trap” has a retractile, proboscis-like 
mouth; tentacles close together, long and pointed, with the eyes 
near their outer bases; mantle-margin simple, with a rudimentary 
siphonal fold; foot obtusely triangular, with a fold in front. 
Exudes a purple fluid when molested. Range from low water to 
80 fathoms. 
Nearly one hundred species have been described, chiefly from 
tropical seas. 
1. 8. Nov-AnetiH, Couthouy. Fig. 137. 
Bost. Journ. Nat. Hist., ii. 96, t. 3, f..5. 1888. 
Shell with the whorls scarcely in contact; whorls ten, crossed 
by about eleven delicate ribs, each forming a little spine in the 
suture above; intervening spaces with numerous minute revolv- 
ing lines; umbilicus small; glossy white. 
Length 17.5, diam. 6.25 mill. 
New England. 
2. 8. pingaTA, Say. Fig. 138. 
Journ. Philad. Acad., ii. 242. 1822. . 
Shell brownish or white, elongated, with about seven volutions ; 
ribs robust, obtuse, little elevated, and from seventeen to nineteen 
on the body-whorl; the body-whorl with generally a blackish, 
more or less dilated line, which is nearly concealed on the volu- 
tions of the spire by the suture; margin of the mouth robust, 
white, dilated below. 
New England to North Carolina. 
