54 BULLETIN OF THE 



shown in the figures; its anterior portion is very oblique, — a feature only- 

 visible in a side view. 



The type species, Sahatia Isseli Bellardi, bears no special resemblance to this 

 shell ; it is of quite different shape, sculpture, and proportions, with a callus 

 more simple and proportionately less developed. A species with a differently 

 shaped aperture and more general regularity of form both in shell and callus, 

 yet closely allied to the present species, is Bulla grandis Seguenza (Form. 

 Terz. di Reggio, p. 250, pi. xvi. fig. 4, 1880), from the Astiano division of the 

 Calabrian Pliocene, collected at Reggio and Gallina. It is even larger than our 

 species, measuring 33 X 26 mm., while the largest specimen of hathrjmophila 

 is only 31 X 24 mm. In the latter a minute dimple indicates the position 

 of the wholly immersed apex in the adult, while in the young the rough callus, 

 though thin, is distinctly apparent in a specimen only 4.0 mm. long, and which 

 has the nucleus and about three turns visible on the apex. The nucleus is 

 reversed and half immersed, smooth and translucent. It is not wholly cov- 

 ered by callus until the shell is more than 7.0 mm. in length. When half 

 covered it resembles the genus Cryptaxis of Jefl'reys. The sculpture in the 

 very young is the same as in the adult. Scaphander niveus and gracilis of 

 Watson probably belong to this group. 



Genus ATYS Montfort. 

 Atys ? Sandersoni Dall. 



Plate XVII. Fig. 7. 



Att/s? Sandersoni Dall, Bulletin M. C. Z., IX. p. 99, 1881. 



Habitat. Station 2, 805 fms. Off Havana (?), Sigsbee, a fragment in 450 

 fms. Station 20, off Bahia Honda, Cuba, in 220 fms., and at Station 127, near 

 Santa Cruz, in 38 fms., sand, bottom temperature 76°. 7 F. 



Since describing this species I have found it in collections named Atys 

 caribcea Orbigny, but the real A. cariboea which I have from Barbados in 100 

 fms. is a more pyriform, less cylindrical, and shorter species. I have seen no 

 authentic specimen of Orbigny's shell, but the Barbados form agrees very well 

 with his figure, and is doubtless the same as he described. It would if adult 

 probably closely resemble A. naucum. 



Genus CYLICHNA Loven. 



Cylichna Verrillii n. s. 



Shell similar to C. alba Brown in size and form with the exceptions follow- 

 ing. It is bluish white and never has the brown outer coat of C. alba, though 

 the extremely thin epidermis sometimes shows a light brown line marginating 

 the apex. It is covered all over with fine spiral strife. The columella is 

 thickened and twisted more than occurs in C. alba, and in C. Verrillii has the 



