TRICHOTROPIS. 245 



Norway : he said tlie animal has the produced lips and 

 lingual dentition of Capulus, and that the operculum is 

 like that of Trichotropis , and supported by a rounded 

 •lobe on each side. 



When I first described this remarkable shelly I erro- 

 neously supposed it to belong to the genus Recluzia of 

 M. Petit, and that it might be the Natica aperta of 

 Loven. I have therefore now withdrawn these generic 

 and specific names, and substituted others in their stead. 



Genus II. TRICHO'TROPIS^ Broderip and Sowerby. 

 PI. IV. f. 2. 



Shell conical, covered with a horny epidermis, which rises 

 into bristly points on the ridges encircling the whorls : sjnre 

 more or less elongated, with a pointed apex : mouili angularly 

 oval, furnished with an oblique and blunt fold on the pillar, 

 near its base ; groove shallow, conspicuous, but not indicated 

 outside by any notch : operculum pear-shaped, small, formed 

 of curved laminae in the line of growth, with a nearly terminal 

 nucleus. 



Trichotropis makes an approach to the canaliferous 

 univalves or Siphonobranchiata. It inhabits stony 

 ground in the coralline zone and sometimes in deeper 

 water. " Lingual dentition similar to Strombus ; teeth 

 single, hamate, denticulated ; uncini 3, 1 denticulate, 

 2 and 3 simple,^^ Woodward. The species are mostly 

 arctic and antarctic ; one has been described and figured 

 by M. Petit from the Mauritius. 



Trichotropis BOREA'Lisf, Broderip and Sowerby. 



T. horealis, Brod. & Sow. in Zool. Journ. iv. p. 395. T. borealis, F. & H 

 iii. p. 361, pi. ci. f. 5, 6, and (animal) pi. II. f. 1. 



Body creameolour, or milk-white, minutely and irregularly 

 speckled with pale yellow : mantle thick ; branchial fold ex- 



* Having hairy keels. t Northern, 



