RISSOIDJJ. 91 



Very remarkable in having the appearance as if two por- 

 tions of quite different specimens were artificially joined 

 together! One specimen has the nine upper whorls typical, 

 with the last unnaturally tumid and slightly out of the axis of 

 the shell. The other, agreeing exactly with above quoted 

 figure, has the eight upper and last whorls regular, with the ante- 

 penultimate strongly inclined to the left, altogether out of the 

 proper axis. The longitudinal ribs are absent from the last 

 four whorls. 



2 Andamans [16, 5| ; diam. anfr. penult. 3 -?,] ; coll. J. Wood-Mason, 



Esq. 



var. substriolata, nov. 



The last three whorls are without longitudinal ribs. ' 



4 Andamans [13|, 4P ; coll. Dr. F. Stoliczka, &c. 

 1 Nicobars; coll. J. Wood-Mason, Esq. 



var. convexior, nov. 



More convex; aperture more everted ; spiral sculpture slightly 

 more distinct ; longitudinal ribbing on all but the las? two 

 whorls. 



4 Andamans [15f, 5|] j coll. J. Wood-Mason and G. Nevill, Esqrs. 



71. Bissoina striolata. 



Rissoina striolata, A. Adams, P. Zool. 8. 1852, Philippines / fide Schivartz, 

 long. 9, diam. 3 mil., anfr. 11. 



5 Ceylon [9|, 3], Mauritius, and Andamans j coll. G. Nevill, Esq. 



var. artensis. 



Rissoina artensis, Moutrouzier, J. de. C., XX, N. Caledonia long. 8$, 

 diam. 2\ mil., anfr. 10. 



3 New Caledonia; ex c. P. Bouvier, Esq. 

 Scarcely separable even as a variety. 



72. Rissoina spirata. 



Rissoa spirata, Sowerby, Gen. of Shells, 1824, pi. 208, fig. 2; fide Schw. 

 long. 10'3, diam. 3-3 mil., from I. Rawak, Red Sea, ami Philippines ; 

 Suez, fide M' Andrew; var.? = R. lamberti, Souverbie, N, Caledonia. 



