254 MELANIIDE. 
Longitudinally, somewhat indistinctly ribbed, ribs flexuous, 
not, so far as I can see, decussated by any transverse lyre. 
10 Kusiyara Rv., &c., Sylhet ; coll. J. Wood-Mason, Esq. 
3 Sudiya, near Darjilivg ; coll, Colonel G. B. Mainwaring. 
Unfortunately not adult, so that Iam unable to feel sure of 
having correctly classified the form. 
var. semilevigata, nov. 
Benson, J. A. S. B., 1836, as M. variabilis, var. D. Sylhet [ew c. A. 8. B.) 5 
Brot, Conch.- Cab. II, 1874, pl. 13, fig. 1, as “ M. sumatrensis, Brot, 
var? 
Long. 56, diam. 242 mil. ; four whorls remaining. 
Var. D. Benson, I.c., “ Anfractuum superiorum costulis obso- 
letis, ultimi et penultimi liris transversis costulis longitudi- 
nalibusque superne serie duplici nodulosis.” 
A very interesting form, admirably described by Benson, 
moderately decollated, upper whorls perfectly smooth, last two 
girt with a double row of prominent regular nodules, more or 
less subobsoletely spirally striate at base of last whorl, one rib 
about the centre [starting from top of the aperture] always 
prominent, the two rows of nodules are joined by longitudinal 
ribs, more or less obsolete; the above described sculpture of 
the two last whorls is sometimes nearly or partially obsolete ; 
in not a single specimen do I find traces of sculpture on the 
upper whorls. Brot’s above-quoted figure is a fair representa- 
tion of the form ; in shape it is exactly the same. Cachar speci- 
mens are more decollate, have the sculpture terminating even 
more abruptly, nodules a little more distinct ; it is very inter- 
esting to find this characteristic variety repeating itself, if I 
may use the expression, in Sumatra. I need scarcely say 
M. Brot’s other figures of his M. swmatrensis (except his pl. 13, 
fig. lb, which may be the young) represent widely different 
forms. . 
15 Cachar and Sylhet (type var.] ; ex c. Asiatic Soc., Bengal. 
The M. infracostata, Mousson, from Java and M. brooket 
from Borneo may possibly all prove to belong to this variety, 
as mere local races ; slight differences in sculpture of the last 
two whorls being their only distinguishing features, apparently. 
80 Doarbund, Silcuri, Cachar ; coll. J. Wood-Mason, Esq. 
