Chap. IV. CONG H 
f erratum. 21. C. obovate, fmooth, with obfolete Arise ; inte- 
rior margin ferrated, Mediterranean and Indian feas. 
edule. * 2 2 . C. antiquated, with 28 depreffed ribs, with ob- 
folete, recurved fcales. Abounds frequently on all Tan- 
dy coaffs, and is lodged a little beneath the fand, This 
is employed as a wholefome and nourifhing food. It 
is the common cockle of this country. 
icelandi- 23. C. grooved with about 36 triangular, fmooth 
cum. ribs. Iceland and Greenland feas. 
greenlan- 24. C, antiquated, glabrous, thin, with angular fer- 
dicum. ruginous lines ; two and three-fourths inches long, three 
and a half broad. Greenland and Iceland. 
ruQicum . 25. C„ antiquated, with 20 remote grooves, the in- 
termediate fpaces ragged. Mediterranean feas. 
glaucum . 26. C. Subantiquated, hind-part with 20 grooves 
imbricated upwards. Barbary. 
pcBinatum 27. C. (lightly heart-fhaped and pectinated; Me- 
diterranean. 
virginjcum 28. C. triangular, rounded, equilateral, with tranf- 
verfe, membranaceo-recurved wrinkles; hinges blue, 
Mediterranean. 
O L O G f. 
4 ° 7 
46. C. rather oblong, white, with bl&ckifh fpots ; cmboi- 
ribs about 1 2, very convex ; 1 inches long. ncnfe, 
47. C. heart-fhaped, equilateral, tawny white and \fquamo- 
purplifh within ; ribs with imbricated fcales. fum. 
48. C. reddifh, thin, rounded, with decuffated cancelia- 
Arise. turn. 
49. C. reddifh, unequal fided ; ribs convex, tran Crubigino* 
verfely Ariatech fum . 
50. C. unequal Tided, ribbed, whitifh, within pur- albidutn. 
pie ; minute, 
51. C, inequilateral, oblong, with fine ribs doubled virefccns. 
above. 
52. C. rounded, whitifn, with a brown band ; ribs fafcialum. 
acute. 
Gen. 8. Mactea. 
Gen. Char .—- The animal is a tethys ; the Aiell is bi- 
valve, unequal fided and equivalve ; the middle tooth 
of the hinge is complicated, with a final! hollow on 
each fide ; the lateral ones are remote, and inferted 
into each other. 
3 1 
Mabtra, 
trilmerum. 
auricula. 
trifle. 
tno'njiro- 
fum. 
lima . 
fingens: 
papyra- 
ceum. 
tsoiicum. 
obiongum. 
crajfum. 
latum. 
pigmeum. 
macula- 
tum. 
Jlexuofum. 
Jluviati/e. 
gadita- 
num. 
brafiltnfe. 
29. C. triangular, gibbous, Ariated. Cafpian Tea. 
30. C. heart-fhaped, fubrhombic, 24 ribs on each 
fide ; the grooves' finely notched ; two and one-fourth 
inches long, one and three-fourths broad. Arabia and 
Egypt. _ . 
31. C. oval, fmooth ; margin Ariated on each fide 
the beak. 
32. C„ gibbous ; one fide impreffed and ochraceous, 
the other convex, heart-fliaped, and whitifh, fpotted 
with yellow. Nicobar iflands. A very rare fpecies. 
33. C. gibbous, with prickly ribs; anterior ones 
with recurved, membranaceous tubercles, crenated at 
the Ades. Nicobar iflands. 
34. C. rounded, ventricofe, white, with deep teeth 
on the margin ; anterior ones rofy. Africa and Ame- 
rica. 
35. C. pellucid, cinereous, with thin longitudiaal 
Arias. India. 
36. ’ C. thick, with longitudinal anterior Arias', and 
tranfverfe poflerior ones. Guinea, Antilles iflands. 
37. C. Yellowifh, oblong, turgid ribbed, anterior 
parts glabrous ; margin notched ; three inches- long, 
two and a half Broad, ribs about 30. Mediterranean. 
38. C. browtiifh, rather oblong, thick, antiquated, 
with deeper teeth on the margin ; ribs about 23. Me- 
diterranean and North feas. 
39. C. broad, unequal Tided, within white ; ribs flat 
and fpinulous : two inches long, two and a half broad. 
Tranquebar and Nicobar iflands. 
* 40. C. fomewhat heart-fhaped, fubangular ; grooves 
imbricated, or befet with recurved fcales. Falmouth, 
Sandwich. 
41. C. with crowded, undulated wrinkles; ribs 
broad, grooves narrow ; three inches long, three and 
one-fourth broad. Bay of Campeachy. 
42. C. rounded, brown; ribs flexuous, grooves 
wrinkled ; inch long, and about the fame breadth. 
* 43. C. flattifh, thick, white, with flat ribs. Mouth 
of the Tees, England. Rare. 
44. C. rounded, yellowifh-white, varied with red, 
green, and brown, and marked with decuffated Arise. 
Cadiz, 
45. C. rounded ; ribs flat, broad, finely notched. 
Brazil. 
Species . 
1. M. fmooth, with a flat, anterior margin., cn which fpengfeti 
is a lunated cape, 3-J- inches broad. Cape of Good 
Hope. 
2. M. with tranfverfe, wrinkled plaits,' diaphanous ^pUcatoria, 
anterior margin flattifh, (hell thin like paper.'; from 1 
to 2 inches long, broad. Indian ocean. 
3. M. thin, pellucid, white, convex, fore-part a papyracea. 
little gaping, finely Ariated and ribbed, Nicobar 
iflands. Very rare. 
4. M. fmooth, diaphanous ; back fubAriated, with J 1 via tula, 
a fmooth marginal impreffion before them, furrounded 
with a rim ; 2-J inches long, 3 broad. Mediterranean 
and Coromandel coafts. 
5. M. triangular, thick, with Arong, thick crov d-friata, 
ed, arched Arise. 
6. M. obtufely triangular, whitifh; with milk-wb ite rolundatct: 
bands on the beak ; margins on each fide the beaks 
violet ; i\ inchlong, and nearly 2 broad, Mediter- 
ranean. 
7. M. fmooth, diaphanous, firiated ; beaks fmooth .giabrata. 
margins on each fide of them firiated ; i-J- inch long 
and 2 broad. African and Indian oceans. 
8. M. fnowy, gloffy, thick, diaphanous, fmooth ; nitida. 
deprefiions on each fide the beaks Ariated, 
9. M. frnooth, fubdiaphanous, white, with paler coralHna. 
bands; 2 inches broad, long. Mediterranean and 
Guinea. 
10. M. thin, turgid, pellucid white ; fore-part fine- laclea, 
ly Ariated, with paler bands. Indian ocean. 
* 11. M. femitranfparent, fmooth, gloffy, obfoletely Jlultorum. 
radiated, white without, purplifh within ; fides nearly 
equal'; length i-J- inch, breadth i|. European and 
American feas, England, and shores of Scotland. 
12. M. femitranfparent, fmooth, fawn colour with grandis. 
pale rays ; beak and hinge placed beyond the middle ; 
2-5 inches long, 3^ broad. 
* 13. M. Arong, fubtriangular, of a yellowifli-white folids. 
colour, with a few concentric ridges; equal fided ; i-J- 
inch long, 1^ broad. Common on European fiiores, 
and alfo in Britain. 
* 14. M. oval, oblong, fmooth, with irregular con- lutr aria, 
centric Arise ; infide gloffy white, gaping a little at both 
ends. 
3 
