220 Mr. Cosmo Melvill on the 



(b) diauges (van nov.), (fig. 5). Yellow, shining, semi- 

 pellucid, shape as in type. One pale central dorsal blotch, 

 otherwise unspotted and uniform pale yellow, including the 

 extremities and teeth. Bears the same relation to the type 

 that C. Helvola^ pale van, bears to that shell. Mauritius. 



{c) gelasinia (van nov.). Shape as in type, with flattened 

 dorsal surface, pale olive green, very delicately pale brown 

 spotted, and with no dorsal blotch, extremities pale fawn. 

 Teeth as in {b). Mauritius. A beautiful variety in the 

 National Collection. 



id) Crosseii^2s\€). Alarge,attenuated, almost monstrous, 

 form, from New Caledonia. 



N.B. — G. brevide?ztata {Sowh.) diXid 0. erytJirceensis (Gray) 

 both seem extreme forms of this species. I would refer to 

 Reeve, Conch. Icon., pi. xiv., f. 63, for a differentiation of 

 the latter. The characters are clear enough when com- 

 pared with the type, and not with intermediates. It is,. 

 however, always of uniformly smaller size. Found at the 

 Red Sea, as far S. as Zanziban My largest specimen only 

 measures ^ inch in length. C. brevidentata (Sowb.) is well 

 figured in Thes. Conch., pi. xxx., f 325, 326. A very rare 

 form, from Borneo, of which but few examples are known in 

 European or American Cabinets. 



C. clandestina (L.). The type of this common species 

 is pale whitish, oblong, ornamented with very fine zigzag 

 brownish yellow lines, sides and base white : teeth very well 

 marked. It varies extremely in size, the largest specimens 

 I have seen are in the collection of Mn J. M. Williams, of 

 Liverpool, nearly i inch in length. 



id) Candida (Pease). A pure white unmarked variety. 



{b) A rttiffel/i Qoussesiume). Is this the same as C. asellus 

 van figured in Sowerby, Thes. Conch., pi. xxx., f 327*? It 

 compares well with the plate in Tryon. Man. Conch., pi. xvi., 

 f. 61. I recollect this specimen in the collection of my late 

 friend Mn Rashleigh, but have had no opportunity of com- 



