RTSSOID2E. 73 



Sub-family RISSOININ^, Stoliczka. 



Genus RISSOINA, Orbigny. 



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

 inca, Orb.,- sect. S. = Rissolina, Gould, P. Bost. S. 1861, type R. plicatula. 

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

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

 MorcJi, type R. decussata, Mtg. ; sect. F. Moerchiella, Nevill, type R. 

 gigantea, Deshayes ; sect. G. = Zebina, H. Sf A. Adams, type R. coronata, 

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



SECTION A. TYPICAL. 



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

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

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



1. Bissoina ambigua. 



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

 long, i, diam. -^ poll. \emend. Otia Con. p. 245, as Rissoina~\ ; 

 = R. multicostata, Garrett, 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. IV, jig. 29 [not of Srocchi] ; = R. STIO- 

 concinna, Souverbie, J. de. C. 18 , New Caledonia, long. 6 to 8%, 



diam. 2% mil. 



The form originally described by Gould was evidently young, 

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

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

 " R. ambigua" seems to be something different. 



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

 Koweiah [Ked 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. 



