58 



eburnea : apertura transversa, sub-rhombea ; columella brevi, 

 acuta, contorta. Lat. -f^, alt. T 9 jj poll. Hab. Madagascar ? 



In form and sculpture this may be compared with the tip of 

 T. pica. The peculiar coloration, representing courses of olive- 

 colored stitches is characteristic. 



Trochus spurcus. Testa parva, solida, globoso-conica, nitida, 

 ubique striis volventibus exilibus insculpta, oblique strigis angu- 

 latis stramineis et fuscis alternantibus variegata, prope suturam 

 maculis quadratis quoque picta : spira anfr. 4-5 ventricosis, 

 ultimo subangulato ; sutura impressa : basis concavo-conica, im- 

 perforata vel arete umbilicata : apertura perobliqua, circularis ; 

 columella arcuata ; labro acuto, simplici ; fauce submargaritacea. 

 Diam. f , alt. T 3 ,j poll. Hab. Madeira. 



Has most of the characters of T. Fermoni, but is very much 

 smaller, wants the peculiar channelled shoulder of the whorls, 

 and the widely open umbilicus. 



Trochus amcenus. Testa parvula, depressa, globoso-conica, 

 levis, nitida, fusca, punctis luteis ubique irrorata, et maculis 

 piceis cum fiavidis alternantibus ad suturam et ad peripheriam 

 ornata : spira anfr. 4-5 convexis, ad suturam constrictis : basis 

 convexa, imperforata, concentrice striata : apertura sub-circu- 

 laris ; regione columellari complanata, alba; columella antice 

 dentifera; labro acuto, striato; fauce livida, margaritacea. Diam. 

 -j^j-, alt. -^,j poll. Hab. Feejee Islands. 



A pretty shell, allied to some of the Mediterranean species, 

 like T. Lessojii. Its small size, minutely freckled surface, with 

 the articulated bands of black and yellow, may mark it. 



Trochus (Monodonta) coltjbrinus. Testa depressa, conico- 

 globosa, imperforata, olivacea maculis subquadratis hepaticis 

 tessellata, sulcis inequalibus minime profundis cincta: spira 

 anfr. 5, planiusculis, ultimo ad peripheriam obtuse angulato : 

 basis convexiuscula, regione centrali absque colorem : apertura 

 semi-circularis, columella acuta, antice truncata et dentem men- 

 tiente ; labro acuto, viridi ; fauce submargaritacea. Diam. £, 

 alt. f poll. Hab. Madeira. 



This shell has the form and texture of Tr. umbilicaris. It 

 seems not to be an uncommon shell, but I find no description 

 of it. 



