232 Mr. Cosmo Melvill on tJic 



lucent varieties, with base \'ellowish white, and the orani^c 

 painting of the extremities almost or quite disappearing. 



C. stapJiyh^a (L.). This is the most puzzling, variable 

 shell in the genus. Many species have been made out of it. 

 They all run so nearly into each other as to merge into 

 varieties. The type is grey or brown, white pustulated all 

 over with small excrescent granules, extremities reddish 

 brown tipped, teeth extended across the base on each side 

 in ridges, sometimes yellow, sometimes white. Very variable 

 in size, '5 to "lo inch normally, but I have a specimen 1*25 

 inch. 



{(i) interstificta (Wood). A form with pustules semi- 

 obliterated, sometimes larger, teeth coarser and darker. 



(^b) liinacina (Lamk.). Smooth, oblong, white spotted,, 

 teeth not extending across the centre of the columellar base^ 

 very near the last var., but the pustules quite undeveloped. 

 I have this also pellucid from the Sandwich Isles. Colour 

 pale straw. A sub-species, as in the next. 



(f) polita (Roberts). A shorter, more brilliantly coloured 

 pellucid shell from the Sandwich Isles, the minute white 

 spots often obsolete except laterally, base white, teeth much 

 as in small specimen of limacina. I do not know C. AnncB 

 (Roberts), but suspect it to be a variety of this protean sub- 

 species. 



[ii^ consobrina (Garr.). Mr. Andrew Garrett {J. of Couch. , 

 1879, p. 1 22) has likewise described Trivia [Pustular ia) conso- 

 brina, which he separates from T. stapJiyla^a, the base being 

 yellowish white instead of livid, and the teeth being mar- 

 gined with yellowish brown, hair like lines, extending quite 

 across the face of the shell, and being more or less bifid ; 

 supplementary ones also may be observed between the 

 primary teeth, which more or less anastomose towards the 

 outer margins of the shell. Length 22 mm. Found rarely 

 at the Viti and Samoa Islands, in dead, but perfect con- 

 dition. 



