TURBO. 219 



turgidi, rotundati ; basis granoso-lirata, callo centrali albo ; 

 apertura oblique ovata ; iabrura crenulatum ; columella 

 oblique arcuata. Operculum oblongum, extus album, con- 

 vexum, g-ranosum, ad marginem attenuatum. — Distinguished 

 by the regular succession of wrinkled ridges and the turgidly 

 rounded margin of the whorls. — Hab. Florida. 



102. IMBRICATUS, f. 97, 107, 115, 116, 133, Gmelin, Syst. 

 Nat. p. 3581 — Trochus corolla. Reeve — Olfersi, Troschel — 

 saxosus, Philippi — laciniatus ? — Testa conica, infra planata, 

 imperforata, albida, carneo- vel fusco-tincta ; anfractus cir- 

 citer 8, superue convexiusculi, deinde plerumque leviter 

 concavi, inferne acutimarginati, costis validis angustis plus 

 minusve squamatis interdum medio interruptis infra mar- 

 ginem productis longitudinaliter ornati ; basis rugoso-striata ; 

 apertura ovata ; columella crassa, valde arcuata ; labrum 

 crenulatum. Operculum ovale, extus album, valde con- 

 vexum, obsolete granulosum, ad peripheriam attenuatum. — 

 A conical species, with very prominent descending ribs over- 

 lapping the basal margin. Reeve's Trochus corolla (pi. xii. 

 f. 133) is a variety of this species of more pyramidal form 

 than the type. Figs. 97 and 115, taken from shells in the 

 British Museum, I have more hesitation in including, the 

 whorls being more convex, and the base rather ventricose, 

 still they are probably only somewhat abnormal forms of 

 the same species. Fig. 116 represents Philippi's T. saxosus. 

 — Hab. AVest Indies. 



103. H^MATRAGUS, pi. ix. f. 102, 103, 106, 110, 31en]ce — 

 var. rhodostoma, Lamarck — var. columellaris, Philippi. — 

 Testa conica, albida, infra planata, imperforata ; anfractus 

 circiter 7, planato-declives, plicato-corrugati, ad marginem 

 spinoso-squamati ; basis circulariter dense imbricato-costata, 

 callo centrali purpureo-roseo. Operculum ovale extus valde 

 convexum, purpureum vel roseum, obscure malleatum, ob- 

 solete late unicostatum, ad peripheriam attenuatum. — A 

 variable species of conical form, more or less roughly ribbed, 

 spined or scaled at the margin, and characterised by a red 

 or purple callosity in the umbilical region, and an operculum 

 of the same colour. In f. 103 the marginal scales are blunt 

 and tubular, forming a single row overlapping the basal 

 angle. Fig. 102 represents Trochus rhodostoma of Lamarck, 

 according to Reeve (Conch. Icon. sp. 32), in which the mar- 

 ginal scales are sharp and divided into two rows. Fig. 106 is 



