MUSEUM OF COMPAKATIVE ZOOLOGY. 2S1 



Genus RISSOINA Oebignt. 



Of this group, so abundant in moderate depths in the West Indies, only a 

 few were collected by the Blake, and these were doubtless adventitious, and 

 were never found living in the region of deep water below the zone of corals. 



Rissoina laevigata C. B. Adams. 



Rissoina laevigata C. B. Adams, Contr. Conch., p. 114, 1850. 



Habitat. Barbados, 100 fras. Northward to the Carolina coast, iu. 15-22 

 fms., U. S. Fish Commission. 



Rissoina albida C. B. Adams. 

 Rissoina albida C. B. Adams, Proc. Bost. Soc. Nat. Hist., 1845, p. 6. 

 Habitat. Barbados, 100 fins. Utilla Island, Honduras, Simpson. 



Rissoina decussata Montagu. 

 Turbo decussatus Montagu, Test. Brit., p. 399, 1803. 



Habitat. Florida, Hemphill. Near Cape Fear, N. C, in 17 fms., sand, at 

 Station 2617, U. S. Fish Commission. 



Not obtained by the Blake. This is R. striosa C. B. Adams, and R. striato- 

 costata Orbigny. 



Rissoina Chesnelii Michaud. 

 Rissoa Chesnelii Mich., Descr. Gen. Rissoa, p. 15, figs. 23, 24. 



Habitat. Barbados, 100 fms. Florida (Rush and Hemphill) northward to 

 North Carolina, U. S. Fish Commission. 



This is R. Catesbyana Orbigny, and R. scalarella C. B. Adams. 



Other species reaching the coast of the United States are R. bryerea Montagu 

 (+ scalaroides Ad.); R. multicostata C. B. Adams; and R. cancellata Philippi 

 (4- pulchra Ad., and Philippiana Pfr.); all of which reach the Florida Keys, 

 while R. Sagraiana Orbigny will probably be added to the list, as it is known 

 from Cuba and is in the National Museum from Vera Cruz, Mexico. 



Genus BENTHONELLA Dall. 



Shell shaped like Niso, but without peripheral or umbilical keels; umbil- 

 icated ; with a regular dextral nucleus of several whorls, of a different color 

 and texture from the succeeding growth; early whorls often slightly trans- 



