RISSOIDE. 73 
Sub-family RISSOININZ, Stoliczka. 
Genus RISSOINA, Orbigny. 
Voy. Amér, Mérid. V, p. 894, 1842 [as Sub- Genus of Rissoa], unique type R. 
inea, Orb.; sect. B.=Rissolina, Gould, P. Bost. S. 1861, type R. plicatula, 
Gld.; sect. C. = Schwartziella, Nevill, type R. bryerea, Mtg.; sect. D = 
Phosinella, Mérch, type R. pulchra, C. B. Adams ; sect. E. = Zebinella, 
March, type R. decussata, Mtg.; sect. F. = Moerchiella, Nevill, type R. 
gigantea, Deshayes ; sect. @.= Zebina, H. & A. Adams, type R. coronata, 
Recluz ; sect. H. = Pyramidelloides, Nevill, type R. miranda, A. Adams. 
Section A.—Typrcat, 
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. Rissoina ambigua. 
Pyramidella ambigua, Gould, P. Bost, S. HI, 1849, Clermont Tonnerre, 
long. 4, diam. 3, poll.—[emend. Otia Con. p. 245, as Rissoina] ; 
=. multicostata, Garrett, P. Calif. Acad. 1857 (not of C. B. Ad. 
1850) = R. costulifera, Pease, J. de C. 1862, p. 882, Sandwich Islands ; 
= R, pusilla, Schwartz, pl. IV, fig. 29 [not of Brocchi]; = R, syb- 
concinna, Souverbie, J. de. C. 18 » Wew Caledonia, long. 6 to 8k, 
diam. 23 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 pl. III, fig. 27, 
“ RB. ambigua,” seems to be something different. 
100 Ceylon, Mauritius, Andamans, Arakan, Penang, Annesley Bay and 
Roweiah [Red 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 ; exc, P. Bouvier, Esq. 
