/ 
WORMS. TESTACEA. 6o. Matra. 209 
Inhabits-———Guwa/t, test. tab. 84 fig. A 
Shell brittle pellucid, greenifh-white; with fometimes a few rofy 
fpots, within filvery, 
Fajciatums Shell rounded, whitifh with a brown band: the ribs acute, 
Inhabits oe "Vergn. 6. tab. 8 fig. 3. 
Hinge brown and cinereous on the outfide. 
60. AL ACTRA, Aniinal-a Tethys: fhell bi- 
| valve, unequal fideds equivalve: middle 
tooth of the hinge complicated; with a 
{mall hollow each fide, lateral ones re- 
mote and inferted mto each other. 
Spengleri. Shell fmooth, with a flat anterior margin on which is a 
lunate gape. 
Chemn. conc. 6. tab. 20. fig: 199—201. 
Shengl. Catab. tab. 4. fig.1—}3. Schrat. Litt. 1. sig. 4—6. 
Inhabits the Cape of good Hope: nearly as large as a man's hand: 
a little gaping, pale, fubdiaphanous, fubtriangular, 3 1 inches 
broad: the anterior fide fubcarinate, the pofterior flaitifh and 
ftriate: gape before the hinge tunate acute and peach ie to 
the hollow of the hinge: decks incurved: intera! rect of the 
hinge triangular. 
Plicataria. Shell with tranfverfe wrinkled plaits, diaphanous: anterior 
‘margin flattili: behind the beaks a compreffed oblong 
gape. 
Chemn. conc. 6. tab, 20. fig, 202- 2044 
Inhabits the Zzdiax Ocean: 1-2 inches long, 2 1 broad. 
Shell thin like paper, with Ímosth lanceolate "depreffions each 
fide the hinge, the anterior one flattifh with a ridge near the 
beaks, the poíterior one imprefled and more ovate: beaks in- 
curved recurved: lateral reeth of the-hinge €ompofed of z 
parallel membranes. 
Papyracea, Shell very thin pellucid white convex, the fore-part a little 
gaping, very finely ftriate and ribbed. 
Chem. conc, 6. tab. 23. fils 24. 
Inhabits Nicobar l/lands, extremely rare: refembles the laft, but 
is more convex and ünequal fided: except in the hinge, is 
very like a Tellina. 
VOL.IV.—Dd Striatuld. 
