222 



ON THE TOl'0(JllArHY AJ^D GEOLOGY 



About the size of S. Saitensis, and not unlike it in general form, but differs in 

 entire absence of longitudinal ribs and in the pi'esence of the ranella-like flattening. 



S . e X i 1 i s . Gabb . n . s. 



Shell minute, slender, spire a little longer than the mouth ; whorls seven ; marked by small longitudinal ribs ; 

 anterior end of body whorl crossed by a few revolving lines. Inner lip encrusted ; outer lip slightly thickened, with 

 the characteristic internal notch, and with three or four teeth in advance. Length .15 inch. 



In size and form this is not unlike the immature shells of S. Saitensis, but a dozen 

 or twenty specimens prove it to be mature, independent of the perfect mouth. It also 

 wants the thickened suture margin of that species. 



I have two fragmentary specimens, indicating a fourth species lai'ger than S. Hai- 

 tensis, more regularly gibbous and with strong longitudinal ribs. Unfortunately, 

 in both cases the anterior half of the body whorl is broken away. ^ " ' ' 



' ' CASSIS. Lam. "\ - : ' 



C. sulcifera. Sby., Quart. Jour., Vol. VI., p. 47, ph 10, fig. 1. ' ' : ' 



Id. Guppy, loc. cit.. Vol. XXIL, p. 286. 



Sowerby's specimen, as figured, is an unusually round one. The inner lip is gen- 

 erally expanded far beyond the body whorl, so as to make the under face a rude right- 

 angled triangle. In old specimens there are three rows of tubercles, and the middle 

 one of the upper row is generally very prominent. ■ : . 



' ■ CASSIDEA. Brug. ■ . , ' ^ ■ ' , ; 



C. granulosa. Briig, Enc. Meth. Vol. L, p. 431. 



Buecinum eassidcum tessdatum, Chemn. Conch, Cab., p. 76. ' ' ■, -■ - '■ - • 



B. i7iflatum, Shsiw. Nat. Misc., Vol. XXiL, pi. 959. - ■ < ; ; , i ' ' 

 Cassis monilifen^ Guppy. Quart. Jour., Vol. XXII, p. 287, pi. 17, fig. 8. , 



Reeve says that Shaw's name antedates that of Brugiere ten years ; but by a 

 reference to the original authors, it is certain that it should bear a later date than 

 1795 (that of both Conch. Cab. and Enc. Meth.), since Shaw not only refers to the 

 figure of Chemnitz, but his illustration is evidently from Conchylien Cabinet, very 

 badly made and sinistral. 



■ CYPR^CASSIS. Stuch. . ■ ' ■ • • - - ; 



C . t e s t i c u 1 u s . Linn. 



ISTot common ; half a dozen specimens found* 



- ■ CASSIDARIA. Lam. ' " \ 



C. laevigata. Sby., Quart. Jour., Vol. VL, p. 47, pi. 10, fig. 3> ' ■ • 



€. s tibiae oigata, Guppy, loc. cit.. Vol. XXIL, p. 287, pi. 17, fig. 10. ' ' ' - 



A study of 160 specimens proves that Mr. Guppy's separation of his species is 

 not based on sufficient grounds. The spire varies more than the difference between 

 the two figures, the striation is a pretty constant juvenile character occasionally 

 retained on adult shells, and I have Icevigata much larger than Guppy's specimen. 



