212 Mr. Cosmo Melvill on the 



{a) flavonitensiy^x. nov.). (Sowb.,Thes.C., pl.xxi., f. 175.) 

 Suffused with rich yellow or orange. Spots often more 

 sparsely distributed. A very beautiful and well known form 

 from Mauritius chiefly, also from the Fiji Islands. 

 Vj ib) hinnulea (van nov.). Pale grey brown coloured, spots 

 almost obsolete. Of very infrequent occurrence, compared with 

 the last variety, corresponding to C. pantherina\^x.jitvenca. 



(<f) riLssonitens (van nov.). Dorsal surface suffused with 

 blackish grey, partly obscuring the spots ; dorsal line an 

 irregular broad blood coloured stain running longitudinally. 

 A rare and striking variety. I have two, formerly in Mn 

 Lombe Taylor's collection. 



{d) cJiionia (van nov.). Spots fewer in number ; dorsal 

 surface therefore whiter in appearance. This runs into {a) 

 frequently, and corresponds to C. pantherina van ic). 

 \^j. (e) ionthodes (van nov.) Dorsal surface with large, often 

 triangular, black blotches, thus partly obscuring the ordinary 

 markings. This colour variety is not very frequent. 



(/") lyncicJiroa (van nov.). Spotted and coloured with 

 blue and fawn in pattern resembling C. lynx (L.), dorsal 

 sinus reddish, very distinct ; shell usually rather stunted, 

 and smaller than the other forms, sides and base white. 



(<^) ^yiJi^crasta (van nov.). Dorsal spots obsolete, the 

 surface entirely suffused with mixed blue red and brown 

 wash, probably owing to the enormous extension of the sinus, 

 from some defect in the mantle of the animal. I have seen 

 a few specimens of this colour variety, and the effect is most 

 striking. Sides as in the type, spotted, base white, normal. 



C. decipiens (Smith). {Proc. Zool. Soc, p. 482, pi. xlviii., 

 f 8, 1880). This, one of the most interesting discoveries in 

 the genus of late years, has been amply confirmed by the 

 arrival of several specimens, now in the National Collection, 

 and received from Exmouth Gulf, W. Australia, through 

 Mn T. H. Ilayncs, and I also have one, from the same source, 

 only acquired whilst these pages were passing through the 



