MELANIIDJ3. 233 



vav. ? [ ? 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. 8. 1847, Tahiti; fide Brotlong. 40, diam. 

 16 mil; andM. tricolor, Brot, Rev.zool. 1860, Tahiti=M.ferrea, Rv. 

 Jig. 9, Borneo ; and Grand Hassan=M. tahitensis, Dkr. 1866, Tahiti ; 

 var=M. luteola, Dkr. 



2 Tahiti ; ex c. Mons. Morelet. 

 Well represented by M. Brot's pi. 24, fig. 7. 



var. luteola [?]. 



Melania luteola, Dunker, No vara Seise, 1866, pi. l,fig. 9, Tahiti long. 21, 

 diam. 7 mil.; fide Brot, M. luteola, Dkr. = M. unicolor, Tryon, 1865, 

 and distinct species. 



5 Tahiti ; ex c. 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 J, 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. 4% lignes. 



6 Navigators' Islands ; coll. Dr. C. E. Tonnerre [A. S. B.]. 



Anfr. 2J ; long. 13J, diam. 7 mil. A very pretty and ap- 

 parently constant form. 



