MARINE MOLLUSCA OF THE UNITED STATES. 39 



Color light horn, with numerous undulated vertical reddish 

 dilated lines. 



Length 0.23 ; of aperture, 0.1. 



New York Harbor. 



The above is a copy of DeKay's description. The species has 

 not occurred to any other collector, and it is therefore impossible 

 to decide upon its distinctness. DeKay himself, in describing C. 

 lunata^ suggests that this species is a variety of it, and the same 

 opinion has been advanced by several marine conchologists. 



5. C. DissiMiLis, Stimpson. Fig. 63. 



Proc. Bost. Soc. Nat. Hist., iv. 114. 1851. 

 Buccinum zonale, Linsley, Am. Jonrn. Science, O. S. xlviii. 285. 



Shell small, ovate-conical, solid, longitudinally sub-striate, fus- 

 cous, often with three white zones; whorls live, flattened; aperture 

 small, sub-equalling half the spire. Animal white. 



Length 5, diam. 2.5 mill. 



Ifew England. 



6. C. siMiLis, Ravenel. Fig. 64. 



Proc. Acad. Nat. Sciences, Philad., '41. 1861. 



This has generally been considered the young or immature shell 

 of G. avara. The latter is a larger shell, and has fewer and much 

 larger ribs on the upper portion of the body-whorl. It has about 

 eleven ribs ; whereas this shell has often as many as twenty ribs, 

 but the number varies; the ribs are also smaller and more regular 

 generally, occupy more of the whorl, and generally are continued 

 on the spire to its apex. White mottled with rufous. 



The principal distinction between this species and C. avara con- 

 sists in its narrower form and generally more numerous ribs. 

 Although frequently confounded with the latter — with which it 

 inhabits, it appears to be quite distinct. 



Massachusetts to Georgia. 



7. C. TRANSLiRATA, Ravenel. 



Proc. Philad. Acad. Nat. Sci., 43. 1861. 

 Shell elevated conic, apex sharp; whorls nine, nearly flat, rather 

 closely ribbed, ribs and interspaces about equal, with five equi- 

 distant revolving striae, from the anterior canal to the apex; body- 

 whorl angulated in the middle, and above this angle the ribs are 

 about half as many as on the whorl immediately preceding it and 

 •nodulous at the suture; the nodules being white. Below the 



