WORMS. TESTACBA. 56. Mya. 137 
Ar&icas Shell ftriate, the valves with 2 fubfpinows ridges: hinge 
without teeth. 
O. Fabr. pn: Grinl. p. 407. n. 408. 
lnhabits the North Seas, among alge; 1$—7 lines long; fize 
of a bean, pale yellow and milk-white within; refembles an 
Arca: anteriorly impreffed and a little flattifh; the fore-part 
very obtufe, the hind-part fhorter and fharpifh. 
Edentule. Shell oval, equivalve, widely gaping and ftriate: hinge 
without teeth: 
Pall. It. 2. p. 700. A 
Inhabits fandy fhores of the Cafpian Sea, about an inch long: 
feell thin, a little antiquated, white, with about 33 ftriz in each 
valve; which are diftant at the fhorter end and more crowded 
in the broader : Ainge with a thickifh inflected lip. 
Radiatas Shell equivalve, pellucid, very finely ftriate traníverfely, 
yellowifh-green with livid rays: valves very broad on 
. one fide and very narrow on the other. 
Chema. conch. 6. tab. 2. fig. 7. 
2, Brownifh with blue radiate lines. 
Lifter conch. tab, 152. fig. 7. 
Inhabits rivers of Ma/abar; thinner and more fragile than M. 
pictorum, broader and more flat ; infide clay-colour: primary 
tooth of the hinge crenate. 
Oblanga. Ovate-oblong; one valve with a broad ftrong tooth let into 
a hollow of the other valve, and a leffer tooth inferted 
between 2 fmall ones of the oppofite valve. 
Chemn. conch, 6. tab 2. fig. 12. 
Inhabits Shel] 1% inch long, 3 inches broed, and is more 
ventricofe than Matta lutraria: refembles M. arenaria, of 
which it is perhaps only a variety. 
Aaatina, Shell globular, fnowy, pellucid : primary tooth of the hinge 
prominent and rounded. 
Adanfon Senegal. tab. 19, fig. 2. 
Chemn. couch. 6. tab. 2. fig. 13. y 
Inhabits Guinea, and refembies the Solen anatinus. 
Shell with decuffate ftriz : each valve fepand on one fide. 
Nicobarica. Shell equivalve, fnewv, ovate-oblong, with decuffate ftrie: : 
tooth of the hinge fingle, broad, perpendicular and 
fpoon-fhaped. : 
Chemn. conch. 0, tab, 3. fig. 17, 18. 
VOL. IV.—Z Inhabité 
