or SAISTTO DOMIiSTGO. Urr v 233 



volutions minntely crcnulatcd ; top of wliorls flat or very slightly sloping, covered by well-marked striaj ; outer edge 

 sliari^ly angulated. Body whorl straight on the sides or very faintly convex near the angle. Surface covered by dis- 

 tant, well marked impressed lines. At the anterior end these lines become confused and the shell marked by a series 

 of wavy ribs. Aperture linear. 



ISTearest to C. sulcatus, but differs in .the straigliter sides and more regular sulca- 

 tion. In size and general form this shell is so like C. Haytensis that in view of the 

 variable nature of that species, I could not have dared to se^^arateit, were it not that I 

 find the suleation very constant in 19 specimens before me, and have not found it in 

 the hundreds of examples of Haytensis. This seems to be a good distinguishing 

 character. . ' 



C. Bonaczyi. Gabb, n. s. ' ■ 



Shell small, convexly turbinated, sides curved, tapering gradually in advance ; posterior angle rounded, spire 

 low, apex acute, side of spire concave ; surface marked by a variable number of revolving grooves, which are dis- 

 tinctly interrupted by lines of growth ; the intervening ribs are flat, or faintly sulcated and show no traces of the 

 growth lines. Top of the whorls very slightly concave, not striated. Length .9 inch, with .5 inch. 



This shell has almost exactly the sculpture of C. jylaniliratus, the ribs being some- 

 what more numerous. But unlike that species it is a short, broad shell with curved 

 sides. Its proportions of length and width are not unlike those of C. mercator. 



C. Yaquensis. Gabb, n. s. 



Shell robust, broad, turbinated, spire low, angle rounded, to\) of whorls grooved, sides convex below the suture 

 and regularly tapering in advance. Color a dark ground regularly tessellated by light spots arranged in close revolv- 

 ing series. 



In size and form, this species is almost identical with C. cedo-mdli, but its colors 

 are so entirely different from anything I have ever seen in that species that I have 

 ventured to name it. » . ,rr-.i 



STROMBUS. Linn. ' 

 S. bituberculatus. Lam., A. S. V., (Desh. Ed.), Vol. IX, p. GOO. 

 S. Haitensis. Sby., Quart. Jour., Vol. VI., p. 48, pi. 9, fig. 7. 



An examination of over 100 specimens proves that the tubercles, on which Sowcrby 

 depended to distinguish this shell from S.inermis, Sw. (= S. accipitrinus, Lam.), are 

 not only variable in disposition, but as sometimes entirely absent. The surface is some- 

 times marked by broad, flat, revolving ribs alternating with fine lines. In other cases 

 only seven or eight broad low ridges occur. The smallest specimens are usually the 

 most close ribbed. 



S. p u g i 1 i s . Linn., Syst. Nat. (13 Ed.) p. 1309. 

 S. amhigaus. Sby., Quart. Jour., Vol. VI, p. 49. 

 S. proximus. Sby., loc. cit., p. 49, pi. 9, fig. 8. 

 S. blfrons. Sby., loc. cit., p. 49. pi. 9, fig. 9. 

 S. pugilis. Guppy, loc. cit.. Vol. XXII, p. 387. 



I admit myself a little surprised that Mr. Sower!)}' should have been betra3'ed into 

 making three synonyms for the best known shell of the West Indies. 



A. p. S. — VOL. XV. OG. 



