504 MAZATLAN UNIVALVES 



interstitiis concavis ; lirulis spiralibus prominentibus, costis 

 s uperantibus ; canali aperturce longitudine subcequante. 



Only one dead specimen was found of this pretty little 

 species, which somewhat resembles in extreme miniature the 

 F. Dupetit-Thouarsii, quoted from the Galapagos, Cuming, and, 

 (though on the authority of Kiener only,) from Mazatlan. 

 Long. '16, long. spir. *08, lat. *07, div. 40. 

 Sab. Mazatlan ; 1 sp. off Chama ; L'pool Col. 



Tablet 2413 contains the specimen. 



641. Fusus APEETUS n. s. 



F. t. subelongatd, atbidd, rufo-fusco irregulariter fasciatd ; 

 anfr. nucleosis ii. tumentibus, irregularibus ; normalibus iii. 

 + . . . haud valde tumentibus, suturd impressd ; costis radiantibus 

 cirdter xii. rotundatis, haud valde prominentibus, basin versus 

 obsoletis ; interstitiis parvis ; lirulis spiralibus, costis super an- 

 tibus ; canali aperto, parum recurvato, longitudine aperturce 

 curtiore. 



The six specimens found of this species were either young 

 or fragmentary ; the size of the nucleus betokening a much 

 larger shell. It differs from F. tumens in the spire being less 

 elevated, the whirls and ribs (which are more numerous) less 

 swollen, and the canal shorter and open. A perfect young sp., 

 with 5 whirls, measures long. 'I, long. spir. *047, lat. '055, 

 div. 40. 

 Hab. Mazatlan ; extremely rare, off Spondylus and Chama ; 



ZSpool Col. 



Tablet 2414 contains 2 young sp. and a fragment of one older. 



642. ? Fusus , sp. ind. (a.) 



Tablet 2415 contains a minute shell, with 2 large irregular 

 nuclear whirls, and a normal whirl, finely cancellated, white, 

 of a subconoid shape. 

 Hab. Mazatlan ; 1 sp. off Spondylus ; L'pool Col. 



643. PFusus , sp. ind. (b.) 



Tablet 2416 contains a minute transparent shell of 3 whirls, 

 of which the first two are swollen and irregular, the third sub- 



