SCAPHANDRIDJE. 235 



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 mill. 

 (Dall). 



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

 allied to the type of that section, S. nobilis 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. nobilis. The Challenger obtained west of Papua a spe- 

 cies of this group, S. mundus Watson, which is very like S. nobilis, 

 but cannot be confounded with the present species (Dall). 



Near the Hawaiian Is., in 298 fms. (Albatross). 



Scaphander alatus DALL, Proc. U. S. Nat. Mus., xvii, 1894, p. 676, 

 pi. 27, f. 2. 

 S. ANDAMANICUS E. A. Smith. Frontispiece, fig. 18. 



Shell ovate, thin, white, here and there ferruginous stained, trans- 

 versely punctate-striate, above and around the base encircled with 

 few, hardly punctate strise ; spire immersed, concave. Aperture 

 large, wide below, narrow above ; lip slightly arcuate, very thin, 

 above white calloused at the thickened insertion ; columella 

 strongly arched, convolute, and visible to the apex within, white 

 and thick. Alt. 18, greater diam. 12, lesser 9 mill. ; aperture 18 

 mill, long, 9 wide below (Smitli). 



Andaman Sea, in 250 fms. 



S. andamanicus SMITH, Ann. Mag. N. H. (6), xiv, p. 167, pi. 4, f. 

 15 (Sept., 1894). 



The punctured grooves, about 40 in number, are not always equi- 

 distant, and the punctures are also variable in size ($.). 



Subgenus SABATIA Bellardi (Vol. xv, p. 255). 



S. PUSTULOSA Dall. PI. 74, fig. 5. 



Shell solid, large, subpyriform, with wholly immersed spire and 

 granular callous body lip ; surface polished, sculptured by deep, 

 rather wide, channeled grooves ; punctate, but with the punctures 

 overlapping one another so that the line presents an annulate 

 aspect. There are a few intercalary, fine impunctate lines also. The 

 form of the shell is rather rounded, smaller posteriorly, with an ob- 

 scure constriction about the middle of the shell ; apex dimpled, but 



