RISSOIDA. 97 
Sub-Genus IRAVADIA, Blanford. 
J. Asiat. Soc., Bengal, 1867, p. 56, type I. ornata, BIf.; fide Stoliczka, 
belongs to sub-fam. Rissoine (anim. ign.]. 
88. Rissoina [Iravadia] ornata. 
Iravadia ornata, W. 7. Blames J. Asiat. Soc. Bengal, 1867, Trawady 
Delia, 
30 Pt. Canning and Irawady Delta [typical]; coll. W.T. Blanford 
aud J, Wood-Mason, Esqrs. 
89. Rissoina [Iravadia] trochlearis. 
Rissoina trochlearis, Gould, P. Bost. S. 1861, China Seas—amais 16, diam. 
073 poll. ;=R. annulata, Dunker, Japan. 
1 Japan; ex ec. Mr. Damon [coll. A. Adams; labelled ‘“ Onoba cinguli- 
Sera, A. Ad,?] 
12 Hong-Kong, under stones at extreme low water ; coll. R. Hungerford, 
Esq. [4, 2]. 
40 Ceylon, Aden, Bombay, Andamans, Singapore, and Arracan; coll. 
F. Stoliczka and G. Nevill, Esqrs. 
var. minor. [? dist. sp.] 
Conch.-Cab. IT, pl. 15 B, fig. 2. 
Shell like that of a miniature R. ornata, covered with a thin 
epidermis. Thick, solid, without the minute, decussating striz 
of the preceding; whorls six, the first two without sculpture, 
the next two with two very strong spiral keels, the fifth with 
three, the last of which is less developed than the other two, 
the last with six of these sulcations; outer lip much thickened, 
fimbriated [as it were] by five of these projecting sulew; 
margins of aperture without any basal notch or canal, joined 
by a callosity ; columella nearly straight. 
Long. 3}, diam. 1} mil. [Kesm]. 
Long. 3}, diam. 13 mil. [Hong-Kong]. 
