OP SANTO DOMINGO. 



245 



In external appearance this species approaches D. dissimile, Guppy, but its thick 

 walls will distinguish it. It differs in this respect only from other species in the 

 genus. 



GADUS. Rang. " 



G. D o m i n g ue n s i s. D'Orb. sp. 



Denialiuvi Domtngicense. D'Orb., La Sagra, pi. 25, fig. 7. . 



^^^ot rare. 



SCURRIA. Gray. ■ . ; 



S. mitra. Esch. sp. ■ . 



Acnima mitra. Esch. Zool. Atlas, 1833, p. 18, pi. 23, fig. 4. ' . - 



S. mitra. Gray, Genei-a 1855. 



A few specimens, which I cannot separate fi'om this familiar West Coast form. 



■■|- 



NACELLA. Sclmm. . ■ 



? N. sp. indet. ■ ■ - 



A single little shell, which seems to belong to this genus. . , 



ACT^EON. Montf. / ' - 



A. tornatilis. Linn. . . i ' ' 



A single specimen. 



A. Cubensis. Gabb. 



Tornatella' punctata. D'Orb., La Saga r, pi. 17, fig. 10-12. 

 Not A. punctata, Lea. 



A variable species. In some specimens the sculpture is nearly absent, in others it 

 covers half, and in others the whole of the whorl. 



ACT^ONIDEA. Gabb, n. gen. 



Sbell long oval ; aperture narrow, outer lip simple ; columella slightly encrusted, bearing one large transverse 

 fold in the middle and truncated in advance. Sculpture revolving ribs. 



The genus is an Actoion, except that it has a single large fold on the middle of the 

 inner lip and the columella is truncated as in Acliatina. 



A. o r y z a . Gabb, n. s. 



Shell small, slender oval ; spire elevated, whorls five, regularly rounded above and below fiattened in the middle ; 

 surface marked by about 30 flat, revolving ribs with punctate intersi^aces. Size about equal to a large grain of rice. 



CYLICHNA. Loven. 



C. sulcata. D'Orb., sp. 



Bulla siUcate, d'Orb., La Lagra, Cuba, pi. 4 bis., fig. 9-13. 



This species has not the anterior fold of CylicJina. 



CYLIGHNELLA. Gabb, n. gen. 

 Shell sub-cylindrical, spii'e sunken, mouth narrow behind, widened in advance. Columella with two folds. 



This genus has the external form of Cylichna, but it has tAvo distinct folds, the 

 upper one is sharp and prominent like that of Actceon, while the lower is more oblique 

 and winds around the collumella in the same manner as that of Cylichna. 



A. ^. S. — VOL. XV. 3.J. 



