RTSSOIB^. 73 



Sub-family BISSOININ^, Stoliczka. 



Genus RISSOmA, Orhignij. 



Voij. Anier. Merid. V, p- 394, 1842 [as Stih-Genus of Rissoa]^ unique type E. 

 ivca. Orb.; sect. JB. = Rissolina, Oould, P. Bost. S. 1861, type R. plicatula. 

 Old.; sect. C. = Schioartziella, Nevill, type R. hryerea, Mtg. ; sect. D = 

 Phosinella, March, type R. pulchra, C. B. Adams ; sect. E. = Zehinella, 

 Morch, type R. decussata, Mtg.; sect. ^. = MoercMella, Nevill, type R. 

 gigautea, Desliayes ; sect. O. = Zehina, H. Sf A. Adams, type R. coronata, 

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



Section A. — Typical, 



Bissoina costulata, Pease, Am. J. Con., 1868, Paumotus, long 5, diam. 2 m., 

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

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



1. Rissoina ambigua. 



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

 long. \, diam. -^^ poll.— [emend. Otia Con. p. 243, as Rissoina']; 

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

 1850) =R. costulifera, Pease, J. de C. 1862, p. 382, Sandwich Islands ; 

 = R. pusilla, Schwartz, pi. IF, fig. 29 [not of BroccW] ; = R, sul- 

 concinna, Souverhie, J. de. G. 18 , New Caledonia, long. 6 to Sk, 



diam. 2\ mil. 



The form originally described by Gould was evidently yonng, 

 hence the many errors that have arisen. The M. ptisllla of 

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

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



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

 Koweiah [K'ed Sea], Seychelles, Bourbon and Aden; coll. 

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



