MELVILL AND STANDEN : MARINE MOLLUSCA OF MADRAS. 43 



Rapana bezoar L. — One specimen, of the typical ribbed form, 

 in fine condition. China, Japan, Philippines. 



Rapana bulbosa Soland. — Many, very fine, and in all stages of 

 growth, with opercula. China, Japan, Philippines. 



Purpura rudolphi Lm. — Hardly typical, and somewhat juvenile, 

 but strongly filletted and well marked. Philippines. 



Purpura tissoti Petit.* — Identical with Bombay examples. 

 The late Mr. Tryon's remarks as to this species J prove that he did 

 not know it, and that Mr. Swift, whom he quotes, was also 

 misled into considering it a var. of the West Indian Cantharus coro- 

 mandelianus Lm. 



Purpura (Stramonita) bufo Lm.* — Many specimens in every 

 stage of growth, with opercula, and showing some variety. Philippines. 



Purpura (Polytropa) sacellum Chemn.* — Also common at 

 Bombay. Many, both young and mature. 



Purpura (Cronia) amygdala Kien. — Typical ; the close ribs 

 thickly covered over with small arched scales. Australia. 



Sistrum iostoma Rv. — Quite typical. The habitat of this 

 species is hitherto unrecorded. 



Sistrum konkanense Melv.* — Described as a Ricimila, but 

 Sistrum has priority. The range of this species, it is interesting to 

 observe, is being gradually extended both north to Karachi, and 

 south to Ceylon, and eastward. The example before us is hardly 

 typical, being not so elongate as the Bombay shells. 



Sistrum margariticolum Brod. — Several of a shell which has 

 not been fully understood by students till recently, but which, in our 

 opinion, is a good species. Mauritius, Loyalty Islands, Australia. 



Sistrum tuberculatum Blainv.* — Common and very variable. 

 The animal is described by Gould in the "Mollusca" of the Wilkes' 

 Expedition as being deep grass-green, with the mantle, locomotive 

 disc, and tentacles light sea-green, finely dotted with white. Japan, 

 Philippines, to Sandwich Islands. 



Sistrum undatum Chemn. — Several typical examples. Tranque- 

 bar, Natal, China, Japan, Australia, Polynesia to Paumotu Islands. 



Family TRITONIDM. 

 Aquillus chemnitzi Gr. (=A. tranquebaricus Lm.)-Some small 

 specimens. Panama, West Coast of Africa, West Indies. We consider 

 Aquillus has precedence of other names proposed for this genus, and 

 is not too like Aquila in ornithology to be discarded in consequence 

 of such similarity ; doubtless the derivation was from 'aqua,' water. 



1 Man. Conch., vol. ?, p. 164, under Cantharus. 



