224 MELANIHXE. 



One or two exactly resemble M. Brot's pi. 21, fig. 5 long. 31 1, 

 diam. 11 mil.; the others have the last whorl more contracted, 

 evenly rounded, instead of slightly subangulate long. 3H, 

 diam. 10 mil. The largest long. 39J, diam. 12f mil. They 

 are all of a plain, uniform coloration, without any traces 

 either of spots or bands. 



subvar. eochlidium. 



Melania cochlidium, Lea, P. Zool % S. 1850, Siquijor and Guimaras ; Keeve, 



fig. 27. 



3 Katchall j coll. F. A. de Roepstorff, Esq. 



The infra-sutural ledge is less marked than in the above- 

 quoted figures, but still quite distinct, especially near the aper- 

 ture. 



var. pirenoidea, nov. 



2 [Camorta ? Nicobars] ; coll.F. A. de Roepstorff, Esq. 



A remarkable, " Pirena-like," strongly decollate and massive 

 form, perhaps the origin of the observation in the voyage of the 

 " Novara " of the finding of a species of Pirena at Katchall ? 



One specimen of 4 whorls measures long. 30, diam. 12 mil., 

 and is well represented by M. Brot's pi. 21, fig. 16a, the apical 

 whorls of course being left out of consideration ; the other of 

 3 whorls, and the internal portion of a fourth has the last 

 whorl more convex, with a slight infra-sutural shelf ; long. 30, 

 diam. 13 mil. M. Brot's pi. 21, fig. 16, though smaller and with 

 the last whorl more cylindrical, gives a very fair idea of it ; 

 both are of uniform coloration. 



2 Camorta ? ; coll. F. A. de Roepstorff, Esq. 



One is a quite young specimen of 7 whorls, slightly decollate, 

 as in Brot's pi. 21, fig. 17; the other of medium growth, has 

 5 whorls remaining, none of which show the apical sculpture 

 as does the preceding. I have little hesitation in referring both 

 of them to this variety as non-adult forms. 



subvar. perdecollata. 

 2 Nicobars j coll. F. A. de Roepstorff, Esq. 



