254 MELANIIDiE. 



Longitudinally, somewhat indistinctly ribbed, ribs flexuous, 

 not, so far as I can see, decussated by any transverse lyrae. 



10 Kusiyara Rv., &c., Sylhet ; coll. J. Wood-Mason, Esq. 

 3 Sudiya, neaf Da,rjiliug ; coll. Colonel G. B. Mainwaring. 



Unfortunately not adult, so that I am unable to feel sure of 

 having correctly classified the form. 



var. semilsevigata, nov. 



Benson, J. A. S. B., 1836, as M. variabilis, var. D. Sylhet [ex c. A. S. B.] ; 

 Brot, Conch.-Cab. II, 1874, pi. Id, fig. 1» as " M. sv/tnatrensis. Brut, 

 var. 



Long. 56, diam. 24J mil. ; four whorls remaining. 



Var. D. Benson, I.e., " Anfractuum superiorum costulis obso- 

 letis, ultimi et perultimi liris trans versis 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. sumatrensis (except his pi. 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. hroohei 

 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. 



30 Doarbuiid, Silcuri, Cachar j coll. J. Wood-Mason, Esq. 



