94 RISSOIDA. 
78. Rissoina semiplicata. 
Rissoina semiplicata, Pease, P. Zool. 8. 1862, Howland Is., long. 33, diam. 1} 
mil., and Am. J. Conch. IIT, pl. XXIV, fig. 29 ; Conch.-Cab. II, pl. 15.4, 
Sig. 2. 
1 Upolu; ex Mus. Godeffroy [4, 12]. 
3 Paumotus; coll. H. Pease, Esq. 
Possibly better classed as a var. of the preceding, the two 
denticulations within the aperture are quite distinct, though 
not recorded in Pease’s descriptions. It can always be dis- 
tinguished by the markedly shorter spire, more tumid last 
whorl, less everted aperture and especially by the ribs on the 
penultimate whorl; the above will also distinguish it from 
R. coronata, Recl., possibly a mere var. of R. bidentata. 
79. Rissoina moravica. 
Rissoina moravica, Hérnes, Foss. Moll, Tert. Wien, 1856. 
1 Steinabrunn ; coll. Herr Schwartz von Mohrenstern. 
80. Rissoina peasiana. 
Rissoina peasiana, G. Nevill, Weinkauff, Conch.-Cab. IT, 1881, pl. 15A 
Jig. 6, Rarotonga. 
A fine species of ten whorls, quite distinct from RB. tridentata 
==curta], the whorls are scarcely convex, the last five whorls 
smooth, the three preceding coarsely ribbed; no teeth within 
the aperture, a small dentiform thickening on the parietal mar- 
gin, near the outer lip; some resemblance to R. macrostoma, 
Desh. [fossil]. 
Long, 12, diam. 5 mil. [the two apical whorls wanting]. 
1 Rarotonga [type]; ex Mus, Godeffroy [as “ R. ? curta, Sow.’’] 
81. Rissoina subulina. 
Rissoina subulina, Weinkauff, Conch.-Cab. IT, 1881, pl. 154, fig. 8, Japan 
—long. 3}, diam. 11 mil. 
2 Japan [type]; ex Mr. R, Damon [“ coll. A. Adams], 
