1917.] NATURAL SCIENCES OF PHILADELPHIA. 217 



By the coloration it resembles Bulla ferriujinosa Chemn., A. Adams, 

 in Sowerby's Thesaurus ConchyUorum II, p. 585, PI. 124, fig. 110, 

 but differs by the decidedly less globose contour of A . kuhnsi. 



Bulla ferruginosa Gmelin {Syst. Nat. 13, p. 3432) is a young Cyprcea^ 

 so that A. Adams' form requires a new name. It may be called Atys 

 naucum strigata. The habitat is unknown. 



Atys semistriata Pease. Fig. 5. 



1860. Atys semistriata Pse., P. Z. S., p. 20; description reprinted in Man, 

 Conch. XV, p. 267. 



The shell is narrowly umbilicate, truncate-ovate, widest below the 

 middle, thin, bluish-white in the middle, opaque white at both ends. 

 The rounded vertex is closely striate spirally, not deeply sunken in 

 the center. Upper part sculptured with about 12 spiral impressed 

 lines, the base with about 16; the middle third smooth. The axial 

 fold above the vertex is rather low and rounded. Columella deeply 

 concave, thin. 



Length 14, diam. 8 mm. 



The largest individual in Pease's lot. No. 31716, Mus. Comp. 

 Zool., is described and figured. I found specimens on the north 

 shore of Kahoolawe. 



The apex is not perforate, as Pease described it, but the spiral 

 curvature of the axis there gives the impression of perforation, in a 

 superficial view. 



Atys debilis Pea.se. Fig. 7. 



1860. Atys debilis Pse., P. Z. S., p. 20; description reprinted in ]\Ian. Conch. 

 XV, 266. 



The type of the species was said by Pease to be in the Cuming 

 collection, so it is likely that that Sowerby's figures {Conch. Icon. 

 XVII, Atys, PI. 5, fig. 28a, b) were drawn from it. I am giving an 

 enlarged photographic copy of one of these figures for comparison 

 with the following species, from which A. debilis differs by being 

 "narrowed posteriorly." Sowerby's figure is 14.8 mm. long. The 

 figures in Man. Conch, were copied from Donum Bisinarkianum.. 

 It is curious that Pease did not mention the projecting point of the 

 fold at the summit, which shows in Sowerby's figure. 

 Atys cornuta n. sp. Fig. 8. 



The shell is thin, cylindric-oblong, tapering to both ends, nearly 

 white. Sculpture of spiral grooves at both ends, about 6 deep and 

 two or three minute ones, more spaced, at the upper end, numerous 

 unequal grooves on the lower third. The vertex is narrow, deeply 

 impressed around the axis, a spiral furrow or concavity within. 



