WORMS. TEST ACEA. 60. Madra; 209 



Inhabits* Gualt, test. tab. S^fg. A. 



&k// brittle pellucid, greenifh-white, with fometimes a few rofy 

 fpots, withifl filvery. 



fajciatum. Shell rounded, whitifh with a brown band : the ribs acute 

 Inhabits— -Knqrr. Vergn. 6. tab, %-fig. 3. 

 /ft'og? brown and cinereous on the outfide, 



66. MACTRA. Animal a Tethys : full bi~ 

 valve, unequal fided, equivalve: middle 

 ftw^A of the hinge complicated, with a 

 ftxiall hollow each fide, lateral ones re~ 

 mote and inferted into each other. 



fyetigkrt. Shell fmooth, with a flat anterior margin on which is a 

 lunate gape. . 



Chemn. cone. 6. tab. 20. fig. 199 — 20 t, 



Shengl.Gatab.tab. 3 //§• l — 3. Schrcet. Ljtt. 1. jig. \ — 6. 



Inhabits the C2/* of good Hote : nearly as large as a man's hand : 

 a little gaping,' pale, fubdiaphanous, fubtriangular, 3 J inches 

 broad: the anterior fide fubcarinate, the posterior flattifh and 

 ftriate: gape before the hinge lunate acute and reaching to 

 the hollow of the hinge : beaks incurved : interal teeth of the 

 hinge triangular. 



tlicataria. Shell with tranfverfe wrinkled plaits, diaphanous: anterior 

 margin fla'ttilh : behind the beaks a comprefled oblong 

 g a P e - 



Chemn. cone, 6. tab. 20 fig, 202- -204, 

 Inhabits the Indian Ocean'. 1-2 inches long, 2 \ broad. 

 «S^//tbin like paper, with fmooth lanceolate deprefBons each, 

 fide the hinge, the anterior one flattifh with a ridge near the 

 beaks; the poltefior one imprefled and more ovate ; beaks in- 

 curved .recurved : lateral teeth of the hinge compofed of 2? 

 parallel membranes. - z 



Pkpyracea. Shell very thin pellucid white convex, the fore-part a little 

 gaping, very finely ftriate and ribbed. 

 Chemn. conc> 6. tab. 23. fig' ^Z^ff TSi I 



Inhabits Nicobar IJlands, extremely rare : refembles the laft, but 

 is more convex, arid unequal fided; except in the hinge, is 

 very like a Tellina. 



VOL. I V.— D d SMMiM. 



