SIGARETUS. 57 



S. PERSPECTIVUS, Say. PI. 24, figs. 61, 64. 



More or less flatly convex, white under a light yellowish epi- 

 dermis, dorsally covered with slightly waved spiral striae, base 

 flattened. Diam., 1-5 inches. 



New Jersey (rare), North Carolina to West Indies. 



Say has compared his species with S. Leachii, Blainv., and 

 several authors have identified it with that species ; but the latter 

 is really indeterminable, and has accordingly been variously 

 interpreted. The synonymy easily includes the following: S. 

 depressus, Phil., a West Indian species ; S. Antillarum, Recluz, 

 perhaps S. halioitoideus of Lamarck and some other authors (not 

 Linnaeus), and Cryptostoma Carolinum of Cuvier. The prob- 

 lematical S. Leachii, Blainv., may possibly be here referred. 



S. DEBILTS, Gould. PL 24, fig. 65. 



Flatly convex, spirally striate above, smooth below, a little 

 depressed round the suture ; white, more or less stained with 

 rusty yellow. Diam., 28 mill. 



Lower California. 



I cannot detect any difference in the shell between this species 

 and #. perspectivus. 



S. PHTLIPPII, Weinkauff. PL 24, figs. 66-68. 



Shell small, white, spirally slightly undulately striate. 



Diam., 18 mill. 



Mediterranean. 



This is S. haliotoideus, Philippi, not Linnaeus, and bears several 

 additional names in its fossil condition, if these fossil forms 

 really are the same species. Some authors have identified the 

 Linna'iin S. haliotoideu-s as this species, but it is indeterminable. 

 It would be difficult to point out any good distinctive characters 

 between this and the preceding and following species. 



S. INCISUS, Reeve. PL 24, fig. 69 ; PL 25, figs. 70-72. 



Dorsally flatly depressed, strongly spirally striated, striae 

 slightly undulated ; white. Diam., 1-1 '5 inches. 



Straits of Malacca, Japan. 



Differs from S. perspective in locality only; a comparison of 

 the characters of the voluminous soft-parts of these animals will 

 be necessary in order to definitely dcnido upon the validity of 



