Chap. IV. 
i tiolacea. 36. O. fiattilh on each fide ; outfide brown, infide 
violet. Mediterranean. 
ourantia. 37. O. roundilh, plaited, and finely Ariated longi- 
tudinally ; a white femicircular band towards the 
hinge. 
vittata. 38. O. within purple, without alternate brown and 
red bands ; rays convex. 
miniata. 39. O. white with confluent red fpots $ rays rough; 
convex valve, with tranfverfe, criip lamellae ; 1 \ inch 
long, 1 \ broad. 
inflata. 40. O. convex on each fide ; clofed, oblong, pellucid ; 
32 rays ; twice as long as it is broad. A rare fliell. 
b. Ears unequal ; one of them generally ciliated, with 
/pines within. 
pallium. 41. O. Ducal mantle. Equivalve, with 1 2 convex 
rays, flriated, rough, and imbricated with icales ; red, 
varied with brown and white ; ears flriated, crenated 
or fcaly. India. 
fanguino - 42. O. equivalve, with 9 thick obtufe rays •, inter- 
lenta. ftices longitudinally flriated, tuberculated and prickly. 
Red fea. 
maculofa. 43. O. equivalve, pale yellow, with tawney fpots ; 
rays 12, thick and flattifh ; ears white, with tranfverfe 
fcaly ribs. 
nodofa. 44. O. with 9 rays, covered with apparently veficular 
tubercles. American and African oceans. 
pcs fclis. 45. O. with 9 flriated rough rays ; one of the ears 
very finall. 
pellucens. 46. O. nearly equivalve, with 9 rays ; fmooth, with 
fpoon-like hemifpherical fcales cn the lower valve ; mi- 
nute, pellucid ; upper valve fpotted with red. African 
feas. 
ohliterata. 47. O. fmooth on the outfide, with 24 double rays. 
Indian ocean. 
fanguinea. 48. O. equivalve, with 22 rays ; ears fmall ; 2 
inches long, broad. Mediterranean and Atlantic 
feas. 
"Jana. * 49. O. equivalve •, rays about 30; comprefled, and 
befet with tranfverfe, prickly fcales ; one ear very 
fmall ; 2 \ inches long, 2 broad. European feas, coalt 
of Britain. 
pufo. * 50. O. equivalve, rays about 40, filiform ; furface 
often irregular or dillorted ; 2 inches long, !-§- broad. 
European and American feas, Cornwall. 
ebfolcta. * 1; 1 . O. equivalve, femi-tranfparent, fmooth ; dark 
purple ; with 8 nearly obfolete rays ; ^ inch long. 
Britilh coafls. 
Is vis. 52. O. fmooth ; ears red ; 4 inch long. Anglefea, 
Falmouth. 
glabra. 53. G. ears nearly equal, equivalve, fmooth, with 
from 10 to 15 fmooth flattifh rays; infide with eleva- 
ted double Arise ; 2 inches long, 2 broad. European 
and American feas. 
opercularis * 34. Q. rays 20 ; ■ roundilh and rough, with decufifa- 
ted Arise ; upper valve a little more convex ; 2-J inches 
diameter. North feas, Devonfhire and Cornwall, 
where it is called frill or queen. 
gibba. 55. O. equivalve, gibbous, with 20 glabrous rays. 
American feas. 
fulcata. 56. O. white, with flefh-coloured fpots; rays gla- 
brous, 32 on the lower valve, 35 on the upper ; i~ 
inch long. Malabar. 
Jiiftrionica. 57. O. thin, flattened, pellucid, with fine tranfverfe 
wrinkles, and 11 rays which are waved. 
CONCHOLOGY. 415 
j8. O. orbicular, with purple circles, 2nd about 1 cc icclandica- 
rays; 3-*- inches long, 3^ broad. Mediterranean. The 
fifh of this fpecies is employed as food. 
59. O. equivalve, glabrous, immaculate, with minute triradiata » 
Arise ; upper valve with 3 rays. Norway feas. 
• 60. O. nearly equivalve, Ariated, fpotted, rough \10-fuci. 
wards the margin. Found on the lucus faccharinus in 
the North feas. 
61. O. nearly equivalve, Ariated, glabrous, red, with tigerinao 
whitilh fpots. O11 fuci in the North feas. 
62. O. nearly equivalve; Ariated, glabrous, rays 7 ,feptemra- 
convex. North feas. diata. 
63. O. nearly equivalve ; within and without grooved arata. 
and red ; one part rough, the other glabrous. North 
feas. 
64. O. convex on each fide, with 22 rounded tran ‘i-fenatoria, 
verfe, wrinkled rays ; interAices with longitudinal, 
granulated Arise ; 24 inches long. Indian ocean. 
65. O. orange, with 22 rounded rays, and plaited chrina. 
margin ; lower valve flatter. India. 
66. O. equally convex, both Ades with 20 glabrous turgida. 
rays ; interAices with tranfverfe, crowded wrinkles ; 
margin with plaited teeth. Indian and American Teas. 
67. O. Aattened, thin, pellucid, Ariated with rwi-filphurec, 
merous imbricated rays ; margin with crenated plates , 
2 inches long. Red fea. 
68. O. convex, purple, within, white or red, with porphyria =. 
25 thick, rounded fcaly rays ; 2-1 inches long. Red 
fea. 
69. O. hyaline, with an acute margin, very flender vitrea. 
rays, and concentric fcaly curves. North feas. 
70. O. with 20 rounded rays ; interAices finely wrin- tranqueba~ 
kled ; margin repand ; upper valve more convex, via. 
Tranquebar. 
7i.O. white, with purple fpots, and numerous un-fauciata. 
equal rays ; margin crenated. Red fea. 
72. O. oblong, with undulated rays and Arise ; and crenulatcio 
tranfverfe, interrupted bands ; a finall fhell ; margin 
crenulated. 
73. O. roundilh, fpotted; with deep grooves finely innomina- 
Ariated tranfverfely : margin crenulated. Small. ta. 
74. O. roundiAi, pale, rufous, with 24 rays ; ears rvfefcens. 
with decuffated Arise ; middle-fized. 
75. O. roundiAi; rays thick, with diAant ^zsd[\it\fquamata, 
fcales, and prickly at the Tides. 
76. O. rather oblong, with narrow fcaly rays ; in- anomjma. 
terAices broader, and Ariated perpendicularly : ears 
perpendicularly wrinkled. 
77. O. Aattened, with jo fmooth, Aat, unequal rays ; decemra* 
ears tranfverfely Ariated. diata. 
78. O. thin, with dtprefied, fcaly rays; ears (hurt. tenuis. 
India, and North. Teas. 
79. O. with 20 rays, and tranfverfe, femilunar bands, valentih 
India. 
80. O. oblong,, with crowded rays, middle-fized, media. 
reddilh. 
81. O. faffron coloured, with muricated fcaly rays crocea. 
alternately lefs; fmall. 
82. O. roundiAi, white, with rofy fpots, radiated ^florida. 
fmall. 
83. O. oblong, ochraceous, with rays fmooth on one ochrolcuca 
part, and granulated on the other ; minute. 
84. O. pale, tawney, with yellow fpots and bands, mufelina. 
and fmooth rays ; ears tranfverfely Ariated ; 2 ~ inches 
long. 
85. o. 
