IgIQ.] N. ANNANDALE & B. Prasuap: Mollusca. 29 
when he first used these names with a collection from what is now 
British Baluchistan and the Afghan frontier. We have been great- 
ly helped by an examination of specimens named by Hutton 
himself. 
The conclusions to which we have come are these, (1) that 
three species, one of which has several varieties, have been as yet 
found in Baluchistan and the extreme south of Persia; (2) that 
Fic. 3.—Opercula of Melaniidae. 
Melanoides tuberculata (Miiller), from large artificial reservoir in 
Hyderabad State. 
M. pyramis var. flavida (Nevill), from spring in the Afghan-Baluch 
desert. 
M. pyramis var. luteomarginata (Nevill), from Persian Baluchistan. 
M. tigrina (Hutton) from Quetta. 
Melanopsis deserticola, sp. nov. from a spring in Persian Baluchistan. 
BOO Ww > 
the correct names of these species are Melanoides scabra var. 
elegans (Hutton), M. tigrina (Hutton) and M. pyramis (Hutton) ; 
(3) that Hutton has included forms of two distinct species under 
the name M. elegans, and (4) that while one of these forms must 
be regarded as a variety of M. scabra, the other is a variety of 
M. pyramis. In our opinion the last is a transitional form be- 
