676 DEEP WATEB MOLLUSKS AND BBACHIOPODS—DALL. voL.xvn. 



The " sand" revealed by so mucli of the bottom as adhered to several 

 of the specimens is wholly composed of organic debris, minute frag- 

 ments of echiuoderms, shells, corals, foraminifera, etc., in which small 

 particles of pearly shell counterfeit the appearance of mica. No 

 mineral matter of a purely inorganic character was detected. 



Molluslis were received from all the stations except 34G7 and 3470. 

 Station 3470 afforded eight species; station 3475, seven species; station 

 3472, four species; au(i the others two species each. 



The Euciroa was obtained at live stations, one of the Pleurotomidoe 

 at three stations, and the two species of DentaUum both occurred at 

 stations 3475 and 3470. 



As it seemed desirable to keep together the scanty data belonging to 

 to the Brachiopoda, rather than to scatter them through several papers, 

 the species obtained by the Albatross at several stations along the 

 eastern border of the Pacific, have been included with the others in 

 treating of that group. 



Class GASTROPODA. 



Genus SCAPHANDER Moiitfort. 

 Section BaccoNiA, D a 1 1 . 

 SCAPHANDER ALATUS, uew species. 

 Plate XXVII, fig. 2. 



Shell pure white, with a pale straw-colored epidermis, polished, punc- 

 tate, with a pervious axis; sculpture of faint lines of growth crossed by 

 numerous fine rows of punctures, with wider, pretty regular, inter- 

 spaces; behind the pillar-lip a few of these rows are so impressed as to 

 form grooves ; form of the shell ovate, attenuated in the posterior third ; 

 aperture as long as the shell, narrow behind, rounded in front; outer 

 lip sharp, produced behind the immersed spire in an alate manner; 

 body with a thin wash of smooth pure white callus; pillar lip twisted 

 about a pervious axis, stout, thick, with a narrow groove behind its 

 anterior part, but no umbilical chink. Extreme length of shell 35, 

 maximum diameter 20 mm. 



Station 3470, in 298 fathoms. No. 107101, U.S.N.M. 



This species belongs to the section Bucconia, Dall. It is nearest 

 allied to the type of that section, S. tiohilis, Verrill, from which it may 

 be at once discriminated by its more attenuated posterior third and 

 generally thicker shell and less inflated form, and by its alate outer* 

 lip. The gizzard plates are somewhat less distinctly quadrate than in 

 >S^. nohilis. The Challenger obtained west of Papua a species of this 

 g:roup, S. mun(h(s, Watson,* which is very like 8. nobilis, but can not be 

 confounded with the present species. 



* Challenger Gastr., j)!. XLViii, fig. 2. 



