MELANIIDE. 233 
var. ? [P dist. sp.]. 
2 Tahiti {?] ; ex c. Dr. F. Stoliczka [labelled “ M. incisa ”]. 
A very doubtful form; I question the correctness of the 
recorded locality. 
20. Melania [Striatella] corporosa. 
Melania corporosa, Gould, P. Bost. S. 1847, Tahiti ; fide Brot—long. 40, diam. 
16 mil.; and=M. bicolor, Brot, Rev. zool. 1860, Tahiti=WM. ferrea, Rv. 
Sig. 9, Borneo ; and Grand Bassan=M, tahitensis, Dkr. 1866, Tahiti ; 
ver.=WM, luteola, Dkr. 
2 Tahiti; ex c. Mons. Morelet. 
Well represented by M. Brot’s pl. 24, fig. 7. 
var. luteola [?]. 
Melania luteola, Dunker, Novara Reise, 1866, pl. 1, fig. 9, Tahiti—long. 21, 
diam. 7 mil.; fide Brot, M. luteola, Dkr. = M. unicolor, Tryon, 1865, 
and distinct species. 
5 Tahiti; ex ce. Dr. Stoliczka. 
These do not agree with any figures in M. Brot’s work, but 
are well represented by the above-quoted figure in the “ Novara 
Reise ;” they are only a little larger and with the columella 
more forcibly and regularly twisted. I cannot separate this form 
as M. unicolor, as M. Brot’s chief characteristic for the latter, 
the longitudinal ribbing on the upper whorls, is altogether 
wanting; near the apex, however, the spiral striation is 
minutely decussated, under the lens. Long. 30}, diam. 10 mil. ; 
anfr. 8. 
21. Melania (Striatella] laxa. 
Melania laxa, Mousson, J. de C., 1869, Upolu, long. 16, diam. 8 mil., anfr, 
2 to 3; fide Brot = M. cylindroides, Baird, Voy. Curacoa, Nieue or 
Savage Island ; long. 9, lat. 43 lignes. 
6 Navigators’ Islands ; coll. Dr. C. E. Tonnerre [A. 8. B.]. 
Anfr. 24 ; long. 134, diam. 7 mil. A very pretty and ap- 
parently constant form. 
