296 WORMS. TESTACEA. 59. Cardium. 
Juhabits the Mediterranean: white, with diftant flrie rough 
upwards; the cavity under the beaks yellow; behind the 
beaks an ovate gape, margins prominent, 
Firgineum. Shell triangular-rounded, equilateral, with tranfverfe mem- 
branaceo-recurved wrinkles: hinges blue. 
Inhabits the Mediterraneex, and approaches to the Genus Mactra 
in the latera! teeth of the hinge: elegantly banded, covered 
with a glaucous cuticle, and white within, 
2. Chem. conch. 6, tab. 18; f. 181, 
Gronov, Zooph. tab. 18, f. 5. 
Inhabits India and America: fhell thin, brittle, longitudinally 
flriate, purple on the anterior margin and red at the beaks, 
Trilaterum Shell triangular, gibbous, ftriate. — i 
Inhabits tne Caffian fea: a very indiftin& fpecies. 
sfuricula, Shell heart-fhaped, fubrlhombic, with 24 ribs each fide, 
the grooves very finely crenulate: beaks diftant. 
Inhebits drabia and Egypt. Regenf. conch. 2. tab. 9. 
Shell white, pzlucid, 2i inches long, 13 broad: margin of the 
back rcvolute, toothed, 
Tof Shell oval, fmooth, the margins each fide the beaks ftriate. 
Inhabits ——. Shell {mooth, cinereous, radiate with white: 
beaks reflected. 
Monfirofum. Shell gibbous, one fide impreffed and ochraceous, the other 
convex, heart-fhaped and whitith {posted with yellow ; 
the valves with toothed ridges. 
Chemn. conch. 6. tab. 14, figs 149, 150 
Inhabits Nicobar iflands: a very rare fpecies. 
Lima: Shell gibbous with prickly ribs, the anterior ones with re- 
curved membranaceous tubercles crenate at the fides, 
.., the intermediate grooves granulate. 
Chemn. conch. 6. tab. 15, fig. 1535 1544 
2. Shrat. Einl. in conch, 2. tab, 7, fig. 13, a, b 
! Inhabits Nicobar Iffands: ochraceous, the anterior margin flefh- 
colour, beaks reddifh: 2) ribs more rounded, not prickly 
but granulate. 
LI 
Ringens. Shell rounded, ventricofe, white, with deep teeth on the 
margin, the anterior ones rofy. 
Lifter, tab. 330. — Adanf. Seneg. tab, 18, fig. 16 
Antry 
