CKROSTOMA. 115 



M. Stimpsoni, a. Adiims. PI. 35, fig. 892.. 



Ovately fusiform ; light fuscous ; spire acute ; whorls seven, flat- 

 tened, shouldered, with smooth revolving lines, the interstices 

 clathrate ; varices widely foliated, rounded and dilated behind ; 

 lip margin widely fimliriate ; canal short, straight, closed. 



JJraga, Japan ; 21 fathoms. 



A young shell of no decided character. 



M. EMARGiNATUS, Sowb. PI. 35, fig. 380. 



White, blotched with light brown. Length, 2 inches. 



Japan. 

 Belongs to the Nuttallii group, but is more gibbous. 



M. FouRNiERi, Crosse. PI. 35, fig. 382. 



Light brown. Length, 1*5 inches. Japanese Sea. 



So like M. Nuttallii., Conrad, that I find no distinctive charac- 

 ters, and I think it will prove to be the same. 



M. Nuttallii, Conrad. PL 35, figs. 381, 386, 391. 



This is the type of Conrad's genus Gerostoma. The shell is, 

 when fresh, whitish, yellowish, brownish or dark chocolate, 

 with sometimes central and basal white bands. 



Length, 1-5-2 inches. California. 



M. aciculiger of Yal. (fig. 391) and M. unicornis.. Reeve (fig. 

 386), I consider synonymous. 



M. MONOCEROS, Sowb. PI. 35, figs. 388, 389. 



More shouldered, the revolving ribs more tuberculate, the 

 varices not so much frilled as in M. Nuttallii., Conr. ; there are 

 fewer teeth within the aperture, and they ' are much larger. 

 Usuall}^ lighter colored than Nuttallii., with a pink blush within 

 the aperture. Length, 1-5 inches. 



L. California. 



This species is described by Sowerbj^ as four to five varicose, 

 but I think it is only abnormally so ; the excellent figure in 

 Reeve is but three varicose, and so are specimens before me 

 which otherwise correspond exactly with Sowerby's fig. 97. Mr. 

 R. E. C. Stearns thinks that M. monoceros is a variety only of M. 

 Nuttallii. Mr. Gabb has re-described fossil specimens under the 

 name of Muricidea paiiciliraia. 



