21 8 Mr. Cosmo Melvill on the 



C. cruenta (Gmel.) is very nearly allied to the preceding, 

 and the variety coloba (fig. 7), so called from the stunted 

 appearance, is also figured in Sowb. Thes., f. 190, as caurica 

 var. ; it would appear nearer this species : the base is always 

 brighter coloured, and teeth interstices bright red. I possess 

 stunted caurica, with which this var. cannot be mistaken. 



There are two species, C. tabescens (Sol.) and C teres 

 (Gmel.), allied to C. catirica (L.). 



The former of these is at a glance known by its teeth, 

 small and numerous, and white base ; but on the dorsal 

 surface it is often impossible to recognise it as distinct from 

 caurica. And I have another variety which is tending to 

 the form of teres. The two are always, however, distinguish- 

 able, and I do not doubt the genuineness of the specific 

 rank they hold, C. teres itself being a narrow, cylindrical, 

 delicately marked shell, with fine, almost obsolete teeth. It 

 ranks among the more prized of the smaller kinds. Cf. Sowb., 

 pi. xxvii., f 259, 260. 



C. tabescens (Solander). Type, cf. Sowb., T. C, pi. xxvii., 

 f 261, 265. 



{a) latior (var. nov.). Cf. Reeve, Conch. Icon., pi. xiv., 

 f 66a. A pyriform shell, broader and more stunted than 

 the type, with brighter coloration, and very distinct dorso- 

 lateral spots. A handsome and rare form, almost sub-specific. 



{b) pellucens (var. nov.). Transparent form, from the 

 Sandwich Isles, dorsal markings indistinct, pale brown. 

 Some specimens large and effuse, others pyriform and 

 broader as var. {a), 



{c) alveolus (Tapparone Canefri). I do not know this 

 form. It is reported from Mauritius, from whence also I 

 have seen unicolorous, thickened, dark green enamelled 

 specimens, shape as in the type, which may be signalized 

 as id) elaiodes. 



C. Rashleighana (Melvill). /. of Conch., V., p. 288, 

 1887, pi. ii., f. 26 ; also fig. 3 in photographic plate appended. 



