RISSOIDE. 79 
23. Rissoina canaliculata. 
Rissoina canaliculata, Schwartz, K. Ak. Wissens. Wien, XIX, 1860, Philip- 
pines, long. 10°6, diam, 4.1 mil. 
1 New Caledonia ; ex c. P. Bouvier, Esq. 
30 Ceylon; coll, J. B. Baxter and G. Nevill, Esqrs. [103, 44 ]. 
A crow carried off a tube full of my best Ceylon specimens ! 
3 Andamans; coll. Capt. R. C. Temple and Colonel Berkely [11, 43]. 
8 Natal; coll. G. Nevill, Esq. [72, 22]. 
A very pretty lanceolate form from Natal, with acute apex, 
and more turriculate, that is with less convex whorls, than in the 
Ceylon one, and in this exactly resembling the typical figure. 
subvar. minor [? dist. sp.] 
1 Mauritius ; coll. G. Nevill, Esq. 
In such bad condition that it is impossible to be sure of the 
absence of spiral striation. 
24. Rissoina monilifera, n. sp. 
Long. 8, diam. 3 mil. 
A very handsome and distinct species, resembling the fossil 
R. lamellosa, Desmoulins, Schwartz, Pl. II, fig. 14, from Dax. 
1 Japan; ex Mr. Damon (coll. A. Adams; labelled “ R. monilifera”), 
25. Rissoina plicatula. 
Rissoina plicatula, Gould, P. Host. S. VIL, 1861 (Febr.), Bonin and Loo 
Choo I.—long. 6, diam, 2 mil. 
A more convexly rounded sp. than RF. plicata, with more 
numerous and less perpendicular ribbing. 
31 Roweiah, Aden, and Annesley Bay; coll. J. B. Baxter, and W. T. 
Blanford, Esqrs. (44, 2]. 
8 Ceylon; coll. G. Nevill, Esq. [6 to 7, 23 to 3]. 
Though in poor condition the interstitional, spiral striation 
is distinctly traceable, under a lens. 
