402 
MOLLUSCA. 
Trochus Zizypliinus — The Magician Trochus. 
Plate LXXXV. fig. 2. 
With strong transverse striae; colour livid, with undulated 
streaks of reddish flesh-colour, or brownish carnation. One 
inch long. Inhabits the European seas. 
Genus 43. — ROTELLA. — Lamarck. 
Generic Character. —Shell orbicular, glossy, destitute of epi¬ 
dermis ; spire short, subconic; lower parts convex and callous; 
aperture half round. 
Rotella vestrarius. — The Kindred Rotella. 
Plate LXXXV. fig. 18. 
Pale skin-coloured, or citron-coloured, the upper part of body 
and spire spotted with dark brown. Half an inch long. Inha¬ 
bits the Indian Ocean. 
Genus 44.—SOLARIUM.— Lamarck. 
Generic Character .—Shell orbicular, in the form of a de¬ 
pressed cone ; largely umbilicated; internal margins of the vo¬ 
lutions, which are visible in the umbilicus, crenulated; aperture 
wide; mouth quadrangular, destitute of a columella. 
Solarium perspectivum .— The Perspective Solarium. 
Plate LXXXV. fig. 23. 
Cream-yellow, with brown or chestnut, and white bands on 
the sutures of the volutions ; umbilicus ample, and crenulated. 
Two and a half inches broad. Inhabits the Indian Ocean. 
TRIBE II.-SCALARIDES. 
Shell devoid of plaits or folds on the columella; margins of 
the aperture united in a circular form. 
Genus 45.—DELPHINULA.— Lamarcli. 
Generic Character. —Shell subdiscoid or conical, umbilicated, 
solid ; volutions of the spire rough or angular ; aperture entire, 
round, sometimes trigonal, with the sides united, and generally 
provided with a fringe, or a thick marginal ridge; spire de¬ 
pressed. 
