PHYLLONOTUS. 105 



M. FiMBRiATULUS, A. Ad. Suppl. pi., fig. 537. 



Ovate-fusiform ; light fuscous ; spire produced ; whorls six, 



convex, longitudinally nodosely subplicate, transversely lirate, 



lines squamulose, equal, crowded ; aperture ovate, entire ; outer 



lip elegantly fimbriated, fimbrise wide, laciniated on the margin ; 



canal straight, produced, closed. There are no varices on the 



whorls, except the broad, fimbriate one which margins the outer 



lip. It is an elegantly formed species with squamulose lirse 



crossing the very convex whorls. Fawn or light-reddish, with a 



narrow, interrupted darker median band ; pale pink or flesh color 



within. Length, 19 mill. 



Japa n. 



Described as a Trophon — which it certainly is not. Mr. E. A. 



Smith has recently published a figure of the species, which we 



copy. 



M. NiTiDus. Brod. PI. 26, fig. 233 ; pi. 27, figs. 242, 243. 



Ovately pyriform, ventricose, spire short, bodj-whorl shoul- 

 dered ; with flat, broad revolving ribs, which, as well as the 

 interstices, are covered with close fine striae ; varices eight to 

 thirteen in number, frondose, the alternate fronds much largest, 

 long, spinous. Whitish,.ridges and fronds black. Length, 4-T 



inches. 



Mazatlan. 



I give to this species its oldest name, which was, however, 

 applied to a 3'oung specimen. The adult has been described as 

 M. nigritus, Phil. (fig. 243), under which name it is more gene- 

 rally known. M. ambiguus, Reeve (fig. 242), is not entitled to 

 distinction even as a variety. 



M. RADIX, Gmel. PI. 27, figs. 244, 247, 248. 



Shell globose, very solid and thick, spire and canal very short; 



spirally ribbed ; varices ten to fifteen, very close set, prickly with 



stout, short, sharp spines. Color whitish, ribs and spines black ; 



but the latter are so close as to give the shell a black appearance. 



Length, 3 to 5 inches. 



Panama. 



Although belonging to a different zoological province, I think 

 that the difierences between this and the preceding species are 

 due to a more stunted and slower growth in M. radix , and that 

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