Chap. IV. CONCH 
and within an elegant purple; It is about 4 inches 
in diameter. The fhh affords a rich and agreeable 
food. 
rugofa . 
gryphica. 
corralio- 
phaga. 
23. C. fuborbicular, with very deep grooves ; wrin- 
kles flightly imbricated ; margin doubly folded. The 
grooves are about 30 in number. 
24. C. oblique, with a lateral oblique pit, wrinkled ; 
callus of the hinge toothed. Barbary. 
25. C. cylindrical, white, diaphanous, with decuf- 
fated ftrise ; the t ran Tver fe Arise arched and imbri- 
cated. 
3 « 
Area. 
toriuofa. 
Gen. 13. Arca, or Ark-fhelL- 
Gen. Char . — The animal a tethys : The (hell bivalve, 
equivalve ; the hinge with a number of teeth, (harp, 
alternate, and inferted all along the rim. 
Species. 
A. Margin very entire ; beaks recurved. 
I. A. parallelopiped, deeply ftriated longitudinally ; 
leffer valve obliquely carinated. Indian ocean. Very 
rare. 
B. Margin entire ; beak inflected. 
note. * 2. A. Noah's ark ; oblong, ftriated, and emarginated 
at the tip •, beaks very remote, bent in ; margin gaping. 
Mediterranean and Atlantic feas, Cornwall. 
barbata. 3. A. oblong, lfriated, bearded with byffus ; beaks 
approximate 5 margin clofed. Europe and Indian feas. 
modiolus. 4. A. oblong, ftriated, anteriorly angular. Medi- 
terranean. 
pella. 5. A. ovate, pellucid, fubftriated •, anterior dope di- 
ftinft, prominent -, hinge ciliar. Mediterranean. 
ovata. 6 . A. ovate, with decuffated Arise, fnowy, and co- 
vered with a ruffet brown epidermis ; margin gaping. 
Red fea. 
pellucida. 7. A. pellucid, brittle, round at each end, obfo- 
letely ftriated ; teeth of the hinge very (harp. Nicobar 
iflands. 
roflrata. 8. A. convex, with tranfverfe Arise 5 hind-part round- 
ed, fore-part extended into an acute beak ; 14 inch long, 
l 4 broad. Baltic and Norway fea?. 
flriata. 9. A. lentiform, with numerous decuffated Arise ; la- 
teritious and reddilh within ; pofterior excavation trian- 
gular ; hinge arched ; an inch broad, and fomething 
longer. Red fea. 
pulchella. 10. A. roundilh, biradiated, with tranfverfe Arise. 
afra . 11. A. whitilh, covered with a w hiter fkin, with de- 
cuffated ftrise ; grooved, and obliquely truncated ; from 
4 to 5 lines long, and 3 broad. Africa. 
fojfllis. 12. A. thick, roundilh, longitudinally ftriated, and 
tranfverfely ribbed ; ribs w ith undulated ftrise ; 3 inches 
long, 34 broad. Found in a foftil ftate in the duchy 
of Limbourg. 
cancellata. 13. A. with cancellated ftrise, and bearded ; mar- 
gin gaping in the middle. American ocean. 
minuta. * 14. A. a little compreffed, tranfverfely ftriated, ta- 
pering at the remoter end, and rounded at the oppefite 
ones ; 24 lines long, and 4 broad. Greenland feas, 
Sandwich. 
C. Margin crenated ; beaks recurved. 
f'aClea. * 13, A. with a rhomboidal, yellowilh white {hell, 
and obfolete decuffated ftrise} fize of a horfe bean. 
European feas, Deyonfhire. 
O L O G Y. _ _ 413 
16. A. oblong, with ftriated tubercles ; beaks in- noduloja. 
curved, remote ; margin entire, clofed. Denmark. 
17. A. obliquely heart-lhaped, with numerous un- antiquata. 
armed grooves. Mediterranean and Indian feas. 
1 8. A. obliquely heart-lhaped, fmooth, with grooves ; femlis. 
margin plaited ; 3 inches long, 4 broad. America, 
Africa. 
19. A. flightly heart-lhaped, with rcMTicrteAgranofa. 
grooves ; i 4 inch long, 14 broad. American and In- 
dian oceans. 
20. A. ovate compreffed; with perpendicular knotty corbicufa. 
ftrise ; beaks obtufe, approximate. Nicobar iflands. 
2t . A. lenticular, with longitudinal ftrise, eroffed by decujflata, 
faint, tranfverfe ones ; anterior Hope clofed. American 
ocean. 
22. A. lenticular, nearly equilateral, perpendicularly erquilate* 
ftriated w ithout and within ; white, with chefnut fpots. ra. 
American ocean. 
23. A. lenticular, a little oblique, v'ith decuffated pollens. 
ftrise ; anterior flope, with a very narrow vent. Indian 
and American oceans. 
24. A. ventricofe ; ftrise decuffated ; anterior dope cucullus. 
heart-lhaped; 2 inches long, and 3 broad. Nicobar 
Hands. 
25. A. rounded on each fide ; chefnut, and marked tnagellani- 
with decuffated ftrise ; external margin infledled, and ca. 
repand in the middle ; beaks approximate. Straits of 
Magellan. 
26. A. rhomboidal, white, with decuffated ftrise ; reticulata » 
beaks approximate ; anterior flope heart-lhaped. 
27. A. pellucid, rhomboid, wdth decuffated ftrise ; Candida . 
fore-part produced ; hind-part truncated. American 
ocean and African Ihores. 
28. A. inequivalve, ovate, with flat, longitudinal indica. 
ftrjse and deep grooves : anterior flope heart-lhaped ; \ 
inch long, i 4 broad. Indian ocean. 
29. A. rounded before and truncated behind, x;\\A\jamaicenfls 
crenated or nodulous perpendicular ribs. Jamai- 
ca. 
30. A. ovate, wdth broad, crenated, or fcaly, per- campeachi - 
pendicular ftrise ; hinge arched. Campeachy bay and enfls . 
Barbadoes. 
31. A. broad, cancellated, truncated before; flatten- lata. 
ed fide heart-lhaped. 
32. A. ovate, longitudinally grooved, with flight fenegalen- 
tranfverfe wrinkles; white; 8 lines long, 10 broad-A* - - 
Africa. 
D. Margin crenated ; leak trfltcied. 
33. A. lenticular, without ears, fmooth, with a undata . 
plaited margin ; 2 inches long, 2 broad. American 
ocean. 
34. A. lenticular, flightly eared, with flightly im -pedluncu* 
bricated grooves; margin plaited; 14 inch long, lus. 
and fomething broader. American ocean and Red 
fea. 
35. A. lenticular, without ears, with fmooth, longi- pelhnata. 
tudinal ftrise. American ocean. 
* 36. A. fuborbicular, gibbous, and faintly ftriated glycymeris 
tranfverfely. European and Indian feas, Cornwall. 
Arca PiIofa y Montagu. 
37. A. fuborbicular, equilateral, hairy; 14 inches pilofa. 
long, 24 broad. Afiatic and American feas. 
38. A. roundilh, fmooth, flightly eared, and tranf -nummarip. 
verfcly ftriated. Mediterranean. 
* 39- A. 
