TUKBO. 19 9 



remarkable species with a shining surface, generally en- 

 circled with narrow grooves, but sometimes plain. It 

 is chiefly distinguished by the excavated sutural channel. 

 Hab. — ? 



25. sPARVEEius, pi. i. f. 3, and viii. 81, Gmelin^ Syst. 

 Nat. p. 3594. — Testa ovato-conica, imperforata, solidiuscula, 

 pallide fusca, nigricante-fusco tessellata ; anfractus 6, convexi, 

 rotundati, spiraliter costati ; costis numerosis latiusculis 

 plano-convexis ; apertura subovata, inferne parum angulata, 

 fauce sulcata, argentea ; labium crenulatum ; columella 

 arcuata, alba, ad basin incrassata et producta. Operculum 

 extus valde convexum, laeviusculum, virescens. — Distin- 

 guished from T. setosus by the comparative closeness and 

 flatness of the ribs, together with the peculiar tessellated 

 style of painting. — Hab. Philippines, &c. 



26. CRAssus, pi. i. f. 5, Wood, Index Test. Supp. pi. vi. 43 

 — canaliculatus Kiener, non Gmelin. — Testa ovata, imper- 

 forata, solidiuscula, viridi et fusco variegata et tessellata ; 

 anfr. superne concavo-angulati, ad angulum obtuse carinati, 

 spiraliter sulcati ; apertura ovata, fauce argentea ; labrum 

 plicatum ; columella arcuata alba, ad basin valde incrassata 

 et producta. Operculum extus convexum, granosum, albidum 

 carneo-tinctum. — A well-marked species, easily identified by 

 the accompanying figure. — Hab. Port Essington, &c. 



27. CASTANEUS, figs. 19, 20, 21, 27, 55, QQ, and 76, 

 Gmelin, p. 3595, No. 28 — crenulatus, Chemnitz — hippo- 

 castanum, Lamarck — virens, Anton — squamiger. Reeve — 

 pustulatus. Reeve. — Testa ovato-conica, imperforata, cas- 

 tanea aut virescente-alba, viridi vel aurantio vel castaneo 

 radiata et marmorata ; spira acuta, sutura anguste canalicu- 

 lata ; anfractus 6, convexi, spiraliter lirati, liris inaequalibus 

 nodosis, interdum squamosis ; apertura subcircularis. Oper- 

 culum circulare, extus elevatum, carneolum, ad marginem 

 leviter granosum. — Another very variable species, the different 

 forms of which seem so distinct tliat the connection between 

 them is only apparent upon the examination of a considerable 

 number of specimens. F. 21, a sliell of uniform chestnut 

 colour, answers best to the name ; f. 20 represents Anton's 

 virens ; f. 27, Reeve's p list idosus ; and 19, 55, and 56, Reeve's 

 squamir/er. — Hab. West Indies, Gulf of Mexico, &c. 



