Chap. IV. CONCH 
bidens. 17. M. ftriated, (lightly curved; hind margin in- 
flefted ; hinge terminal, two-toothed ; fcarcely an inch 
long. Mediterranean and Atlantic feas. 
modiolus. * 18. M. fmooth, blackilh, obtufe at the (mailer end, 
and rounded at the other ; one fide angular, near the 
beaks ; from 6 to 7 inches long, 3 broad. European, 
American, and Indian feas, Devonfhire, Weymouth. 
cijgneus. * 19. M. ovate, very brittle, tranfverfely wrinkled ; 
anterior end compreffed, the other rounded ; hinge 
lateral ; from 2 to 5 inches broad, and 3 long. Fre- 
quent in the lakes and rivers of Europe, Britain. — It 
is the largeft of Britilh frefh-water (hells. It arrives 
at the greateft fize in ponds and ftagnant waters. 
analinus. 20. M. oval, a little compreffed ; brittle and femi- 
tranfparent, with a membranaceous margin. Fre(h 
waters of Europe. — It refembles the laft, but is longer 
and narrower. Ducks and crows, it is faid, are ex- 
tremely fond of both this and the laft fpecies. 
viridis. 21. M. fmooth, ovate, membranaceous, pellucid, 
with a terminal hinge. Southern ocean. 
ruber. 2 2. M. wrinkled ; valves oblique and anteriorly di- 
lated. Southern ocean. 
albus. 23. M. tranfverfely ftriated ; beaks gibbous ; hinge 
lateral ; 6 inches long, 3^ broad. Shores of Chili. — 
The filh is white, and affords a grateful food. 
atcr. 24. M. grooved, and fcaly behind. Chili. — The 
fi(h is black, and unfit for being eaten. 
difcors. *2^. M. oval, horny, fubdiaphanous ; extremities 
longitudinally ftriated ; middle tranfverfely. European 
and fouthern feas, Cornwall and Devon lb ire. From the 
South feas it is inch broad ; in Britain it rarely ex- 
ceeds ~ inch. 
hirundo. 2 6. M. fmooth ; valves 2-lobed ; lobe at the hinge 
longer and thinner. American, Mediterranean, and 
Indian feas. 
pholadis. 27. M. oblong ; more obtufe on the fore- part ; 
rough, with tranfverfe wrinkles ; i^- inch long, i^r 
broad. North feas. — This fpecies penetrates beds of 
coral and other rocks, like the pholas. 
Jlriatulus. 28. M. finely ftriated, hinge terminal, 1 tooth ; i-J 
inch long, 1-4 broad. Northern and Indian feas. 
vulgaris. 29. M. flattened on one fide and inflefted ; beaks 
incurved, convergent ; hinge l-toothed. American 
ocean. 
plicatus. 3c. M. rhombic, inequilateral ; tranfverfely ftriated 
and wrinkled ; beaks incurved. Nicobar iflands. 
mveus. 31. *M. ovate, fubdiaphanous; finely ftriated longi- 
tudinally ; margin acute ; hinge 2-toothed ; (hell fnowy 
and polifhed within. Nicobar illands. Very rare. 
afer. 32. M. nearly triangular, dilated before, and flat- 
tilh gaping behind ; beaks pointed, turned back ; mar- 
gin very acute ; 4 inches long, 2 broad. Mediterra- 
nean and African (hores. 
fmaragdi- 33. M-.. nearly triangular, flattilh ; hinge 2-toothed 
nus. in one valve, 1 -toothed in the other. Tranquebar, 
Guinea. 
verjicolor. 34. M. nearly triangular, fiattifh ; hinge 1 -toothed ; 
margin glabrous, acute ; 3 inches long, 2 broad. 
Guinea. 
coralho- 33. M. earinated in the middle, and crenated at the 
pfiagus. margin, with an obtufe knob ; \ inch long. Indian 
and American oceans. Perforates rocks like a pholas. 
lineatus. 36. M. triangular and dilated outwards, with angu- 
lar, decuffated, and confluent lines ; hinge 2-toothed. 
A minute (hell. 
O L O G Y. 42 1 
37. M. oval, rufous, ftriated, with a crenulatedy^iSft. 
margin. Seas of Greenland. — This fpecies is the food 
of the anas hiemalis and hijlnonica. 
38. M. thin, (lightly wedged ; beaks recurved and Jluvialilist 
large. Frelh waters of Europe. 
39. M. oblong, narrow, finely ftriated tranfverfely ; fufcus . 
one fide emarginated, the other rounded ; beaks pro- 
minent, curved. A minute brown (hell. 
40. M. broad, fhort, and rounded behind; beaks mamma* 
conic, protuberant. rius. 
41. M. broad, and curved with a rough, rugged, perjicus* 
yellow coat ; within milky. Perfian fea. 
42. M. broad, very fmooth, flammeous or rofe-co-//<f?vr. 
loured, with white bands ; beaks obtufe. Portugal. 
43. M. pellucid, Ihining, bluilh, with a claret co -fafciatus* 
lour and pale red bands. Brazil. 
44. M. broad and rounded at both ends ; claret co -undatus. 
lour, with waved, bluilh, and greenilh ftriae ; margin 
ferrated. Portuguefe fea. 
45. M. rounded behind ; pale flelh-eolour ; purple purpureas* 
within ; margin denticulated. Shores of Brazil. 
46. M. ear-lhaped, with granulated wrinkles on i'nefaxa tills. 
outer fide, dilated and rounded. Amboyna. 
47. M. tranfverfely ftriated, rounded at each end ; argenteus » 
brown, filvery within ; beaks rounded. 
48. M. narrow, ftiining bluilh colour, with violet fulgidus „ 
(pots at the fides ; beaks rounded, dilated. Seas of 
Magellan. 
49. M. gibbous, azure, with yellowish ftripes be- azurcus, 
neath ; beaks obtufe ; 1 inch broad, | long. 
50. M. moufe-coloured, with violet fpots, and a murinus„ 
broad, rounded, rofy margin ; beaks pointed ftraight. 
Guinea. 
51. M. long, narrow, covered with a teftaceous tejlaceus* 
(kin ; ftiining filvery beneath, varied with blue,_ red, 
yellow, and brown. 
5 2. M. dilated outwardly ; greenilh yellow, with virgatus . 
rofy ftripes ; beaks obtufe, curved. 
53. M. oblong, very thin, white, with bbfolete ftrise, cordatus, 
and a heart-lhaped gap behind. Indian and Southern 
oceans. 
54. M. oval, flattilh, and tranfverfely ribbed ; eight flagnalis. 
inches broad, 4-i long. In frefh waters. 
55. M. oval, convex, rounded behind; elongated, %ellenjis a 
and obtufely pointed before ; beaks obfolete ; 7 inches 
broad, 3 long. Stagnant waters of Germany. 
56. M. fuborbicular, with 15 triangular crefted rofeus. 
grooves, and alternate triangular teeth ; 3 inches broad. 
Africa. 
57. M. gibbous, pointed, with 15 grooves ; marginpuniceus^ - 
toothed ; 14 lines long, and half as broad ; hinge with 
4 minute teeth. Africa. 
58. M. flat, thin, with fine grooves; covered with niger. 
a black Ikin, under which it is milky, and finely po- 
lilhed ; ii inch long ; grooves about 100. Africa. 
59. M. flat, fmooth, covered with a thick fulvous leevigalus, 
(kin, under which it is rofy ; 2 \ inches long. Africa. 
60. M. tranfverfely wrinkled ; obtufe at each end ; dubius. 
fulvous, within pearly ; beaks obfolete ; hinge without 
teeth ; 5 inches broad, 2 long. Frelh waters of Sene- 
gal. 
61. M. 5-celled ; valves earinated and flattilh on po/ymor- 
the incumbent fide ; beaks obtufe and inflected back -phus. 
wards ; fize of a plum ftoiie. Ruffian fea, and in frelh 
waters, where it is much larger. 
62. M. 
