83 



MONOGRAPH OF THE GENUS 

 SCALARIA. 



Char. Gen. MoUuscum marinum trachelipodum : testa 

 spirali, pyramidali ; varicibus concentricis ; apertura sub- 

 rotundata ; margine crasso, integro : operculo comeo pauci- 

 spirali. 



A genus of marine trachelipodous mollusca, with a spiral 

 shell of a more or less pyramidal form, and a flat, horny 

 operculum with a few spiral turns. The edges of the aper- 

 ture are outwardly thickened at various periods of growth, 

 forming external ribs or varices. The aperture is rounded or 

 oval, with a thickened, entire margin. 



DESCRIPTION. 



I. Sc. PRETiosA. pi. xxxii. f. 17.) Lam. Turbo Sca- 

 aris, Linn. 



T. ventricosa, laevi ; late perforata ; anfractibus separatis, 

 rotundatis; varicibus 11 — 13 distantibus, subcrenulatis, lam- 

 in atis, extantibus, paululum recurvis ; apertura magna, ovali, 

 antice sub-quadrata : colore inter varices pallide fulvo-purpu- 

 rascente, apertura interne fulva. 



Obs. This is the well known " Wentletrap," which 

 although more frequently met with now than formerly, is 

 still an object of value when in good condition ; and strikes 

 even the uninitiated observer with the unrivalled beauty of 

 its sculpture. China. 



2. Sc. Pallassii. (pi. xxxii. f. 14, 15, 16.) Keiner, 

 Turbo Principalis, Pallas (ut dicunt auctores nonnulli) var. f. 

 14. Sc. nicobarica. Beck; M.S. 



T. sub-ventricosa, Icevi, perforata ; anfractibus sub-rotun- 

 datis ; varicibus extantibus, laminatis, ad angulum posticum 

 in dentem acutum productis ; ad suturam junctis : apertura 



L 



