7t TRACHELIPODA. 



Rostellaria pes pelicayii. — The Pelican's Foot Rostellaria. 

 Plate XL fig, 25. Turrited, tiesh-coloured or white ; body and 

 volutions longitudinally ribbed, and crowned with papillae ; 

 base of body papillose. One inch and a half long. Inhabits 

 the European seas. 



FAMILY V. CANALIFERA. 



Shell with a canal of greater or less length, situated at the 

 base of the aperture ; the outer lip differing little in the young 

 and adult state. 



Sub-Division I. — Having a permanent varix on the outer lip, 

 and varices on the spire. 



Genus 26.— TRITON.— ZawiarcA. 



Generic Character. — Shell ovate or oblong, with a canali- 

 culated base ; having alternate or nearly solitary varices ; which 

 are longitudinally prolonged ; aperture oblong, provided with an 

 operculum. 



The varices in this genus are not in continuous rows from the apex, and 

 the base as in Murex and Ranella, but in interrupted alternating series. 



Triton variegatum. — The Variegated Triton. Plate XI. 

 fig. 26. Elongated, conical, tubiform ; suture of the spire crenu- 

 lated ; pillar tip grooved obliquely ; pale purple, elegantly clouded 

 and spotted with brown. Sixteen inches long. Inhabits the 

 Indian and American seas. 



Genus 27.— MUREX.— imnaMs. 



Generic Character. — Shell ovate or oblong, with a canalicu- 

 lated base ; furnished with rough spinous or tuberculated varices, 

 in each volution of the spire, the lower ones uniting with those 

 above, forming continuous rows ; aperture with a corneous 

 operculum. 



The Shells of this genus are easily distinguished by their having three or 

 more rows of varices on each whorl ; while the Ranella have only two, and 

 the Struthio larise but one only and that situated on the margin. 



SiscnoN * Shells with a slender beak, always longer than the aperture. 



** Beak thickened, not abrupt, and more or less lengthened. 



+ Volutions with three varices. 



f t Volutions with more than three varices. 



