18. unicolor, Sowb. — C. elongatus, purpureo tinctus, inferno 

 substriatus; spira convexa, anfractu ultimo distanter coronata 

 (f. 83) . — A peculiar shell, of a fawn-colour tinged with purple, 

 spire convex, crowned with distant nodules. 



19. muriculatus, Soivb. — C. oblongus, solidus, seriatim gra- 

 nulans ; spira convexa, maculatu, obtuse coronata ; albus, ad ba- 

 sin cferuleo tinctus, medio castaneo late bifasciatus (f. 89). — With 

 a spotted, obtuse spire, granulated surface, light chestnut broad 

 bands in the middle, and blue at the base. 



20. CiELATUS, A. Ad. — C. parvus, transversim sulcatus, sulcis 

 longitudinaliter striatus ; albus, aurantiaco late reticulatus ; spira 

 depressa, apice acute elevato, anfractibus minute coronatis (f. 107). 

 — Marked like the Marmoreus group, but encircled with deep 

 grooves, striated across. 



21. lividus, Brug. — C. solidus, fulvus, interne et ad basin 

 cseruleus, medio et ad angulum pallidus ; spira convexa mediocri- 

 ter coronata, apice acuto (f. 27). — The well-known blue-tipped 

 obtuse species. 



22. sugillatus, Reeve. — C. C. livido similis, sed spira castanea, 

 subcanaliculata, testa fasciata, (f. 50).- — Although the banding 

 is more distinct and the whorls of the spire more canaliculated, 

 I think this is but a variety of C. lividus in a young state. In a 

 series of specimens the distinctions are lost by gradation. 



23. citeinus, Gmel. — C. subpyriformis, breviusculus, medio et 

 ad basin distanter granulatus, interne et ad basin purpureus; 

 spira obtuse coronata (f. 70). — I think the young of C. lividus 

 is straighter than this shell, and Quoy, who names it C. sanguino- 

 lentus, describes the animal as of a bright red colour. 



24. oblitus, Reeve.— G. angustatus, lrevis, luteo-olivaceus, su- 

 perne creruleo-alba, medio fascia pallida cinctus; spira convexa, 

 minute coronata; fauce et basi violaceis (f. 37, discoloured, and 

 f. 100).— The narrowed form and minute coronation distinguish 

 this from C. lividus. 



25. distans, R-rug. — C. elougatus, medio subcontracts, basi 

 attcnuatus, fulvus, pallide zonatus, versus basin leviter elevatim 

 striatus, violaceo-nigrescente tinctus ; spira convexa, nodulis ob- 

 tusis albidis coronata, interstitiis fuscis, apice truncate ; fauce 

 grisea (f. 28, 29). — llemarkable for the peculiar depression of 

 the apex and the white nodules of the spire interlined with dark- 

 brown. 



