RTSSOiDiE. 73 



Sub-family BISSOININ^, Stoliczka. 



Genus RISSOINA, Orhlgm^ 



Voy. Amer. Merid. V, p- 394, 1842 [as Sub-Genus of Rissoa], unique type R. 

 inca. Orb.; sect. B. = RissoUna, Oould, P. Bost. S. 1861, type R. plicatula. 

 Old.; sect. C. = Schwartziella, Nevill, type R. Iryerea, Mtg. ; sect. D = 

 Phosinella, Morch, type R. pulchra, C. B. Adams ; seel. E. = Zebinella, 

 March, type R. decussata, Mtg, ; sect. F. = Moerchiella, Nevill, type It. 

 gigantea, Deshayes ; sect. Q. = Zehina, H. <^ A. Adams, type R. coronata, 

 Recluz ; sect. H. = Pyramidelloides, Nevill, type R. miranda, A. Adams. 



Section A. — Typical. 



Rissoina costulata, Pease, Am. J. Con., 1868, Paumotus, long 5, tlinm. 2 m., 

 belongs to the typical section as does R. incerta, Souverbie, from New 

 Caledonia, and R. terebra, Garrett, from the Pacific Islands. 



1. Eissoina ambigua. 



Pyramidella ambigua, Gould, P. Bost, S. Ill, 1849, Clermont Tonnerre, 

 long, \, diam. -jL poll. — \_emend. Otia Con. p. 245, as Rissoina']; 

 = R. multicostata, Oarrett,-P. Calif. Acad. 1857 {not of C, B. Ad. 

 1850) =R. costiiUfera, Pease, J. de C. 1862, p. 382, SandwicJi Islcmds ; 

 = R. pusilla, Schwartz, pi. IV, fig. 29 [not of Brocchi] ; = R, sub- 

 concinna, Souverbie, J. de. C. IS , New Caledonia, long. 6 to 8i, 



diam, 2? mil. 



The form originally described by Gould was evidently youno-, 

 hence the many errors that have arisen. The B. pusilla of 

 Brocchi is scarcely separable ! Schwartz's pi. Ill, fig. 27, 

 " B. ambigua,^' seems to be something different. 



100 Ceylon, Mauritius, Andamans, Arakan, Pennng, Annesley Bay and 

 Koweiah [Hed Sea], Seychelles, Bourbon and Aden; coll. 

 W. T. Blanford, F. Stoliczka. J. B. Baxter, J. Wood-AIason, and 

 G. Nevill, Esqrs. 

 10 Upolu and Sandwich I. ; coll. H. Pease, Esq., and ex Mus. Godeffroy. 

 3 New Caledonia ; ex c. P. Bouvier, Esq. 



