236 SCAPHANDRID^E. 



imperforate ; aperture narrow behind, wide and rounded in front 

 outer lip thin, raised above the apex, but hardly alate ; inner lip 

 thick, callous, with numerous pustules, the axis barely pervious ; 

 pillar thick, pustular, its outer edge high, with a groove behind it, 

 but no umbilical chink. Extreme length of shell 33, maximum 

 diameter 20 mill. (Dall). 



This species recalls the more inflated Scaphander niveus Watson, 

 from near the Philippines, but is readily distinguished by its more 

 attenuated ulla-\ike form. It may, when older, exhibit a more 

 prominent body callus than is shown by our specimen, the granula- 

 tion of the pillar being much like that of adolescent specimens of 

 Sabatia bathymophila Dall, from the deeper waters of the Antilles. 



(Dotty. 



Near the Hawaiian Is., in 295 fms. (Albatross). 

 Sabatia pustu losa DALL, Proc. U.S. Nat. Mus., xvii, 1894, p. 677, 

 pi. 26, f. 10. 



Genus ATYS Montfort (Vol. xv, p. 261). 



It is evident from the very meager data at hand regarding the 

 soft parts of the species grouped under Atys, that at least two or 

 three genera will be formed by its disintegration. The dentition of 

 typical Atys and of Alicula is still unknown. The dentition and ex- 

 ternal anatomy of Roxania (see Vol. xv, pi. 61, f. 32, and pi. 59, f. 13) 

 and of Weinkauffia (this vol. frontispiece, figs. 10, 11, 12) show that 

 these belong to two distinct though allied genera. 



Roxania will probably include Roxaniella as a subordinate group. 

 Whether Weinkauffia is generically distinct from Atys or Dinia re- 

 mains to be seen, the latter being still unknown anatomically. 



Vayssiere has recently (Journ. de Conchyl., 1893, p. 90, pi. 4) ex- 

 amined Atys (Weinkauffia) diaphana Arad. & Mag. Part of his 

 text and figures are given below. The systematic position of Wein- 

 kauffia which he suggests (between Bulla and Haminea) seems to 

 me to be wholly untenable. 



ATYS DIAPHANA Arad. & Mag. Frontispiece, figs. 8-14. 



Animal with numerous spots of a beautiful brown-red color of 

 very diverse forms and irregularly scattered, disposed in three series 

 across the shell through which (by its transparence) they are seen. 

 Head-shield squarish, with two posterior conic processes, the eyes 

 contiguous, near posterior part of head shield ; pleuropodial lobes 



