136 CONCHOLOGY. 



T. sarmaticus. T. crenulatus. 



T, cornutus. T. hippocastanum. 



T. argyraslomus. T. muricatus. 



T. Chrysostomus. T. littoreus. 



T. radiatus. T. ustulatus. 



T. margaritaceus. T. Nicobaricus. 



T. setosus. T. neritoides. 



T. Spenglerianus. T. retusus. 



T, petholatus. T. rudis. 



T. undulatus. T. obtusatus. 



T. pica. T. pullus. 



T. versicolor. T. caerulescens. 



T. smaragdus. T. cancellatus. 



T. cidaris. T. costatus. 



T. pica. The Magpie Turbo. PI. 24, fig. 6. 



Species in which the aperture is obhque ; the columella 

 losing itself entirely in its continuation with the margin, the 

 umbilicus always uncovered ; colour black and white. 



T. setosus. The bristly Turbo. 



Thick, transversely and deeply sulcated, longitudinally 

 striated ; spire short, volutions rounded, lip crenulated ; in- 

 side pearly, variegated with white, green, and brown. 



T. rugosus. The rough Turbo. 



Species of which the aperture is perfectly round in the di- 

 rection of the axis ; the operculum horny. 



5. Planaxis. Two species. 



Shell marine, generally small, solid, of an oval conical form, 

 oblong, a little sloping in front ; columella flattened and trun- 

 cated anteriorly ; right margin furrowed or radiated within, 

 and thickened by a callosity running to its origin ; opercu- 

 lum oval, thin, horny, and sub-spiral. 



Planaxis sulcata. Planaxis undulata. 



P. sulcata. The furrowed Planaxis. PL 27, fig. 4. 

 Imperforate, furrowed transversely ; outer lip crenulated 



