RISSOIDA. 83 
Probably priority will have to be given to M. Audouin’s 
name. 
var. microstoma [an R. microstoma, sp. nov. ?]} 
Long. 43, diam. 2 mil. 
1 Oman [Persian G.]; coll. W. T. Blanford, Esq. 
36. Rissoina scalariformis. 
Rissoina scalariformis, C. B. Adams, Cat. Panama Shells, 1852, long. 3-3 
lat. 1°27 ; fide Schwartz, Panama and Mauritius, also probably smaller 
var, Red Sea. 
var ? 
4, W. Indies ?; ex c. G. Nevill, Esq. (3; 1}7. 
37. Rissoina mainwaringiana, nu. sp. 
10 Persian Gulf [type]; ex c. Colonel G. B. Mainwaring, 
38. Rissoina, n. sp. 
Long. 3, diam. 1} mil. This cannot be any of Gould’s spe- 
cies ; it resembles the W. Indian R. firmata, C. B. Adams. 
1 Hongkong ; coll. R. Hungerford, Esq. (“ very rare’), 
Section D.—Puxostnetita, Mérch. 
Mal. Blat. XXTII, 1876, type R. pulchra, C. B. Ad. ; = Group IV, Schwartz, 
1. ¢., page 39. 
There is a R. balteata, Pease, from Hawaii, long. 4, diam, 
1} mil.—perhaps = BR. exasperata, Souverbie ? 
89. Rissoin cancellata. 
Risssoina cancellata, Philippi, Zeits. 1847, p. 127,. Cuba—3}, 
var. pulchra, 
Rissoina pulchra, C, B. Adams, Contr. Conch. p. 114, Jamaica; fide Mirch, a 
distinct species, 
4 W. Indies; ex c. J. Wood-Mason, Esq. 
