sipiio. 131 



and clearly defined. The costae are more arcuated posteriorly, 

 and the embryonic whorl larger, with revolving threads instead 

 of being smooth. Whorls five and a-half. Costa^ nine to eleven 

 on the last whorl ; ridges more numerous than in S. brunneus, 

 but almost too faint to count. Length, '65 inch. 



Kyska Harbor, Alaska ; 10 fathoms. 



None of the specimens fully adult, but clearly different from 

 any other described species of the region. — Dall. 



S. Jessoensis, Schrenck. PI. 53, figs. 345, 346. 



Light roseate or reddish, under a light olive-green epidermis. 



Length, 27 mill. 



Japanese Seas ; 48 fathoms, sand and mud. 



My figure is from the original ; afterwards the same species, 

 apparently, was described by Mr. E. A. Smith under the name of 

 Sipho 3[anchuricus, A. Adams' MS.; and in this description 

 the specimen is larger, attaining the above length. Some of the 

 preceding species may be identical Avith it. 



S. ANGUSTUS, E. A. Smith. 



Fusiform ; whorls about ten, slightly convex, longitudinally 

 plicated, finely spirally striated; plicae somewhat oblique and 

 arcuate, not particularly raised, broader than the interstices, 

 about eighteen on the penultimate whorl ; last whorl contracted 

 and produced })elow into a slender, recurved beak ; aperture 

 rather less than half the- entire length of the shell. Whitish, 

 with a broad obscure brownish V)and round the middle of the 

 whorls, clothed with a greenish yellow epidermis ; aperture light 

 brown within. Length 25 mill., diam. 6*5 mill. 



Vancouver^ s Island. 



Remarkable for its slender form. It is not figured, and I know 

 nothing concerning it. 



Undetermined Spevies^qf Sip)ho. 



S. RECTiROSTRis, Carpenter. PI. 53, fig. 348. 



Puget Sound, etc. 



No diagnosis of this species has been published ; it is merely 

 mentioned in Carpenter's 2d Report, and figured in KUster from 

 a drawing furnished by W. H. Dall. 



