Crtrea. 
Tara. 
Rugofas 
Gryphicas 
Corallio- 
phag as 
qortusja. 
oy 
WORMS. TESTACEA. 65. Arca. 249 
Shell roundifh ventricofe inequivalve muricate, with fcat- 
tered unequal fcaly fpines. 
Inhabits America. Regenf. conch. Y. t. 4. f. 44> 
Shel] citron.colour. 
Shell roundifh, longitudinally ftriate: pofterior flope retufe. 
Molin. nat. Hist: Chili. p. 178. 
Inhabits the CAz/e% fhores, where it buries itfelf in the fands: 
hell white violet and yellow; within elegantly purple: about 
4 inches in diameter: the fifh is a very rich and pleafant food. 
Shell fuborbicular, with very deep grooves: the wrinkles 
flightly imbricate: margin doubly folded. 
Inhabits about the fize of a man’s finger: gibbous, thick, 
with 30 grooves; the outer margin with concave eminent 
projections from the wrinkles, the inner margin obtufe plaited: 
hinge with 2 or 3 oblique grooves declining towards the an- 
terior fide: 
Shell oblique with a lateral oblique pit, wrinkled: callus 
of the hinge toothed. 
Inhabits Barbary ; relembles Anomia Gryphi: 
Shell very ponderous and thick, about the fize of a fift; beaks 
obliquely incurved back: anterior flope longitudinally grooved 
and oblique towards the beaks, pofterior flope longitudinally 
concave. 
Shell cylindrical white diaphanous, with decuffate ftrize; the 
tranfverfe {triz arched and imbricate. 
Tühabits Chemn. conch. 10. fab. 172. fig. 1673, 1674. 
65. ARCA. Animal a Tethys? /Ael/ bivalve, 
equivalve: Ange with numerous fharp 
teeth alternately inferted between each 
other. 
A. Margin very entire: beaks recurved. 
Shell parallelipiped, deeply ftriate longitudinally, the leffer 
valve obliquely carinate. 
Rumpf. uf. tab, 47. fig. k. Gualt. tel. tab. 95. D. 
Bonann. Muf. kirch. 2. fig. 122, 123. Barbut. tab. 7. fig. 1. 
Petixy. amb. tab, 20. J1g- 9. Argenv. conch. tab. Yg. I. 
Klein ofr. tab. 8. fig. 16. Leffer teft. fig. 137. 
VOL. IV.—li Kucrr 
