Chaster — On the MoUusca obtained by the R.I. A. Cruises. 21 



J. NiYosA, Montagu, sp. {Turbo). 



Log 6, 25, F. This species is remarkaWy rare in the material 

 examined. The Txwlo nivosus of Montagu and the Odostomia 

 truncatula of Jeffreys helong to a very distinct group for which 

 I suggest the name Jordaniella. Mr. Jordan's name is appropri- 

 ately associated with 0. truncatula, he being the first to recognize 

 its peculiarities. 



Onbina bivisa, J. Adams, sp. {Turlo) = Odostomia insculpta, auct. 



Logs 6, 9, 12, 18, 22, 28, 33, 34, 35, 42, 63 ; depth, 4 to 79 

 fathoms. The specific name divisa ought unquestionably to be 

 adopted: Adams' description, brief as it is, applies perfectly to 

 the present species and to it alone. Gray's generic name 

 Auriculina (1847) was preoccupied by Gratel in 1838. Conse- 

 quently De Eolin's Ondina, 1870 stands. 



O. DiAPHANA, Jeffreys, sp. {Odostomia). 



Logs 6, 12, 22, 25, 33 ; depth, 5 to 52f fathoms. 



O. Warreni, Thompson, sp. {Rissoa). 

 Station YIII. 



Pyegulina inteestinota, Montagu, sp. {Turlo). 



[Station YL] Logs 6, 12, 28, 33, 34, 35, 63, A ; depth, 

 4 to 55^ fathoms. Montagu's type, judging from his descrip- 

 tion and measurements, is evidently the small slender form 

 which Jeffreys called the variety suturalis, supposing it to be 

 the Rissoa striata, afterwards R. stcturalis, of Philippi. The 

 more robust form which Jeffreys took as his type may perhaps 

 be recognized in Brown's Jaminea oltusa, in which case the form 

 should be called var. obtusa, Brown. Both forms occur in the 

 dredgings. 



P. DECussATA, Moutagu, sp. {Turbo). 



Station VI. Logs 6, 25, 26, 33, 35 ; depth, 4 to 52^ fathoms. 



P. INDISTINCIA, Montagu, sp. {Turbo). 



Station YIII. Logs 3, 9, 11, 12, 28, [33], 39, 42, 63, 70, 

 73 ; depth, 7 to 80 fathoms. The majority of the specimens are 

 broader than the type form, with more convex whorls and finer 

 sculpture. They differ from the var. brevior, Jeffreys, in their 

 large size. In the material from logs 12, 39, and 42, there 

 occurred specimens of a remarkable form perhaps referable to 

 the present species. The shells are small, the largest measuring 

 only 2*2 mm. the longitudinal ribs are stronger than those of 



