MAGILUS. 21 1 



M. COSTATUS, Soweiby. PI. 09, fig. 421. 



The revolving- eost.T are perhaps simph' a pronounced form of 

 the somewhat eA'anescent lines or stria^ which freqnently occur 

 on M. anf/(fHitj<. The costie continue on the tube. 



Jlab. ? 



M. Cunmigr/\ H. and A. Adams, described as from California, 

 is evidently the same species, and probably described from the 

 same specimen. The name had alread}' been used by Deshayes, 

 f therefore prefer to retain Mr. 8owerby's later name r-ostatuH. 



M. RuppELLii, Deshayes. PI. »i8, tig 41'2 ; PI. (59, ligs. 414. 418. 



I unite with this form 31. Cuming ii (fig. 418), and M. </lohu/oHafi 

 (fig. 414), Desh. 



The spire is sometimes depressed so as to make the distinction 

 from M, antiquus arbitrary, and the body-whorl is narrowed 

 below, and somewhat produced in sonu' specimens so as to suggest 

 a passage into the next form. 



Me of Bourbon. 



Mr. Sowerby's fig. 1 b., in the Conch. Icon. (fig. 413), appears 

 to me to represent this form, although I do not dispute his deter- 

 mination of it as M. o,7itiqiiv>i. 



M. Maillardi, Deshayes. PI. 09, figs. 410, 41.3, 417. 



The type is a depauperate shell, somewhat distorted, the normal 

 growth being better shown in M. Lamarckii., Desh. (fig. 41.5), 

 and M. solidiuscula, Pease (fig. 417 ). I have before me a series 

 connecting these species. I have ali-eady suggested their rela- 

 tionship through M. Buppel/ii with M. antiquus; on the other 

 hand some transition forms to 3f. fim.hriatii>< are not wanting. 



Mr of Bonrhoi,. 

 M. FIMBRIATUS, A. Ad. PI. 09, figs. 419, 420, 422, 423. 



The fimbriated, riljbed surface, in the type, the great expansion ' 

 of the body-whorl and large aperture suggest the genus Con- 

 cholepas, and Mr. Adams originally made a subgenus Goralliohia 

 under Concholepas., for his species ; afterwards H, and A. Adams 

 made Goralliohia a subgenus of Leptoconrhus. The shell is verj' 

 like Coralliophila madrepjorarii'm, which I have placed in the 

 subgenus Galeropsis, Hupe, but difters in the surface and in 

 color. The expansion of the li]) does not appear to be uniform ; 



