228 BULLETIN OF THE 



the largest posterior ; suture deep, distinct ; canal broad and hardly recurved, 

 rather short; operculum? Epidermis polished, close fitting, and not hispid. 

 Max. Ion. of shell, 23.6; of nucleus, 2.7; of last whorl, 15.5; of aperture, 7.0; 

 max. lat. of shell, 11.5; of aperture, 3.8 mm. 



Habitat. Station 293, in 82 fms., sand, Barbados, bottom temperature 

 64°.5 P. 



A shell with somewhat the general form of T. gcmmatum Eeeve, and a mouth 

 and terminal varix recalling that of T. Lcebbeckii Lischke. It is less broad 

 and short than the latter, and not nearly related to the former. I am unable to 

 find in Tryon or elsewhere any closely related species described, and so am 

 obliged to treat it as new. 



Of other species of Triton iidce, T. labiosus Wood (+ Loroisii Petit) extends 

 its range to within a few miles of Cape Hatteras. T. vespaceris Lam. and 

 T. rubecula L. are more or less positively reported from the Antilles, while 

 T. (Lotorium) fcmorale L. is found in Florida and southward. The presence 

 of several other species is surmised. 



Family OOCORITIDiE. 



Genus OOCORYS Fischer. 



Oocorys Fischer. Journ. de Conchyl., XXXI. p. 392, Oct., 1883. 

 Benthodolium Verrill, Trans. Conn. Acad., VI. p. 177, May, 1884. 



? Section OOCORYS s. s. 

 Columella simple, twisted, shell imperforate. 



Oocorys sulcata Fischer. 



0. sulcata Fischer, Journ. de Conchyl., XXXI. p. 392, Oct., 1883 ; Watson, Chall. Rep. 

 Gast, p. 412, pi. xvii. figs. 11 a-c; Fischer, Man., p. 769, fig. 536, 1884. 



Habitat. Station 173, off Guadelupe, in 734 fms., ooze, bottom temperature 

 40°.0; Station 227, off St. Vincent, in 573 fms., sand, bottom temperature 

 40°.5; Station 268, off Grenada, in 955 fms. ooze, bottom temperature 39°. 5 F. 

 Atlantic Ocean at great depths, Fischer, and Challenger Expedition. 



In this singular mollusk we have another instance of the comparatively 

 limited value of the form of the operculum, or even its presence. Tritonium, 

 Cassis, Dolium, Oocorys, are all nearly related, yet the operculum is absent in 

 one group and in the others assumes most varied forms. By its dentition, its 

 nucleus, and its thickened reflected lip and body callus, as well as its (occa- 

 sional?) repetition of the varices, it approaches Cassis more nearly than Dolium, 

 and perhaps such species as Tritonium (Linatella) Poulsenii Morch, of which 

 the operculum is unknown, more nearly than either. 



