EUCHELUS. 439 



conic, apex subacute, first whorl smooth, remaining whorls con- 

 spicuously lirate ; penultimate and whorls of the spire with 3 prom- 

 inent spiral ribs, the first bounding the broadly canaliculate suture, 

 followed by 2 minute spirals, the second and third separated by 

 a space which has a central riblet ; on the last whorl there is another 

 prominent spiral rib just below the periphery ; the base has about 8 

 alternately larger and smaller spirals ; the entire surface is covered 

 with close, sharp, elevated vertical striae crenulating the ribs and 

 interstices. Last whorl rounded ; aperture large, quite oblique, ex- 

 panded, finely sulcate within ; columella subvertical, decidedly reced- 

 ing, nearly straight, a trifle reflexed above, and bearing a small 

 denticle near the base, below which it is obscurely crenulated. 

 Alt. 16, diam. 16 mill. 



Singapore I (Archer) ; Indian Ocean. 



Trochus scaber Chemnitz, FISCHER, Coq. Viv., p. 288, t. 93, f. 2. 

 ( f Trochus scaber CHEMNITZ Conchylien Cab. v, p. 107, t. 171, f. 

 1667 ; 1781). Tr. scaber Linn.? PHILIPPI Conchyl. Cab., p. 262, t. 

 39, f. 2. ( / T. scaber LINNE Syst. Nat, x, p. 758.) 



As a temporary expedient I have taken Fischer's name for this 

 shell, giving himself instead of Chemnitz as authority. I do this 

 because it seems to me scarcely possible that it is the form named by 

 Chemnitz. I believe Philippi's " / T. scaber L." to be the same, but 

 am not at all sure it is the T. scaber of Linne. I would suggest that 

 Chemnitz's and Linne's names be allowed to lapse as wholly uni- 

 dentifiable ; Philippi's scaber is somewhat doubtful ; but as Fischer 

 has given an unmistakable portraiture of a distinct, well-marked 

 species, I am willing to consider his decision final. However this 

 question may be settled, I have before me specimens of the shell 

 agreeing with those so well figured and described in Fischer's 

 magnificent monograph. It is quite a different thing from E. 

 quadricarinatus Chem., belonging perhaps rather near to the group 

 of fossulatus, cancellatus, etc., species of much the same general 

 aspect. 



E. ATRATUS Gmeliu. PL 38, fig. 22. Vol. X, pi. 41, figs. 25, 26. 



Shell umbilicate, globose-conic, solid ; color black, brown, or 

 grayish-pink, either unicolored or tessellated with dark spots ; spire 

 short, conic; sutures deeply canaliculate; whorls 5-6, convex, 

 encircled by numerous equal, densely, finely beaded spiral ribs, 

 with deep interstices, in each of which an interstitial riblet arises on 



