SIPHO. 131 



and clearly defined. The costoe are more arcuated posteriorly, 

 and the embryonic whorl larger, with revolving threads instead 

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

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

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



Ky*ka Harbor, Alaska; 10 fathoms. 



None of the specimens fully adult, but clearty different from 

 any other described species of the region. Pall. 



S. JESSOENSIS, Schrenck. PL 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 Manchuricus, A. Adams' MS. ; and in this description 

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

 preceding species may be identical with 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 below into a slender, recurved beak ; aperture 

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

 with a broad obscure brownish band 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 Species of Sipho. 



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 Kiister from 

 a drawing furnished by W. H. Dall. 



