i22 Bulletin 29 



Dolophanes melanioides Gabb, Trans. Amer. Phil. Soc, vol. 15, p. 235, 



1873- 



Crepitacella cepula Guppy, Quart. Jour. Geol. Soc. London, vol. 32, p. 



524, 1876. 

 Crepitacella cepula Guppy and Dall, Proc. U. S. Nat. Mus., vol. 19, 



no. 1110, p. 328, 1896. 

 Crepitacella cepula Dall, Trans. Wagner Inst. Sci., vol. 3, pt. 6, p. 



1585, 1903- 



For this interesting shell Gabb created in 1873 the genus 

 Dolophanes. But Guppy in 1866 had described a similar shell 

 from Cumana as Melanopsis cepula, for which the following year 

 he founded the genus Crepitacella. Guppy and Dall found the 

 Cumana and Dominican species identical. 



The probable descendant is the deep sea C. Gabbi Dall, 

 which unlike its tropical ancestor lives in nearly freezing water 

 at a depth of 785 fathoms in sand and ooze. 



Localities. — (Exp'd '16) Bluff 1, Cercado de Mao; Zone B, 

 Rio Gurabo at Los Quemados. (Rare). 



Crepitacella ceptda variety spiralis triata, n. var, 

 Plate 21, Figure 10 



Shell resembling C. cepula Gabb, but with stronger sculp- 

 ture, longitudinal riblets closer, higher, more conspicuously coro- 

 nated on the shoulder angle; surface ornamented with fine, close 

 spiral threads. Length 15, width 6 mm. 



Gabb found similar spirally striate specimens. 



Locality. — (Exp'd '16) Zone B, Rio Gurabo at Los Que- 

 mados. (Rare). 



Genus Triforis Deshayes 



Triforis Calypsonis, n. sp. 

 Plate 21, Figure 13 



Shell of medium size with slightly curving sides; suture 

 deep; protoconch of about two whorls, each with two strong ad- 

 jacent spirals, crossed by many oblique riblets; post-nuclear 



