86 TRACHELIPODA. 



with three acute, divaiicate digitations. 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 states. 



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

 lip, and varices on the spire. 



Genus 26.— TRITON.— Zawm/cA. 



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

 culated base ; having alternate or nearly solitary varices, 

 which never form longitudinal continuous ridges ; aperture 

 oblong, provided with an operculum. 



The varices in this genus are not in continuous roAvs from the apex 

 to the base as in Murex and Ranella, but in interrupted alternating 

 series. 



Triton variegatum. — The Variegated Triton. Plate 

 XI. fig. 26. Elongated, conical, trumpet-shaped ; suture of 

 the spire crenulated ; pillar lip grooved obliquely; pale pur- 

 ple, elegantly clouded and spotted with brown. Sixteen 

 inches long. Inhabits the Indian and American seas. 



Genus 27- — MUREX. — Linnceus. 



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

 culated base ; furnished with rough spinous or tuberculated 

 varices, on each volution of the spire, the lower ones uniting 

 with those above, so as to form continuous rows ; aperture 

 with a corneous operculum. 



Tlie Shells of this genus are easily distinguished by their haA^ng 

 three or more rows of varices on each whorl ; -while the Ranella have 

 only two, and the Strutliiolariae but one, and that situated on the 

 margin. 



