403 
Chap. IV. 
minor, 
verruca, 
angujlata, 
porofa. 
elongate . 
patellaris. 
/pin of a. 
viojacea. 
polUcipss. 
cylindrica 
xrifpata. 
curiofa. 
Jlrcemia. 
faj'c ic il- 
ia r is. 
C 0 N C H 
unequal ; lid pointed. 
6-valved ; 4 outer 
2D. L. reddifii, 6-valved, 
India. 
21. L. hemifpherical, ferrated 
valves and lid plaited. North feas. 
22. L. elongated, fmooth, 6-valved ; aperture nar- 
row, lid minute. 
23. L. granulated and driated, conic, tuoular ; lid 
obtufe. India. _ i 
* 24. L. cylindrical, fnpwy, pellucid, 6-valved ; iid 
obtufe, grooved and tranfverfely driated. Three inches 
long. Iceland, Weymouth. Ralanus Ciavalus, Mon- 
tagu, p. 10. _ _ 
25. L. 6-vaived ; outwardly violet mixed witn white, 
and marked with fine longitudinal idrise ; valves denti- 
culate at the margin. Coromandel, very rare. 
26. L. conic with 1 2 triangular valves, 6 more de- 
preffed, whitilh and tranfverfely driated, and 6 purple 
and longitudinally driated ; all armed with tubular 
recurved fpines. India. 
27. L. 6-valved, thick, glabrous, white, with violet 
rays. India. 
28. L. many-valved, compreffed, ereid, fmooth ; 
feated on a Ihort, hard, fcaly peduncle. Mediterranean. 
29. L, flightly curved, with a large oblique orifice ; 
lip horned. Africa. 
30. L. oval-truncated, conic, with 6 bluilh valves 
{haded with white, and 6 reddilh, elevated, fpinous, 
and perpendicularly driated ; an inch high ; is fre- 
quently perforated by the teredo. 
31. L. folid, white, deprefFed with carinous grooves, 
unequally fmooth internally. Kurile -iilands. 
32. L. ccnico-convex, 4 valves ferrate-driated ; lid 
2-valved. North feas. 
* 33. L. 5-valved, fmooth, dorfal valve dilated at the 
bale. St George’s Channel. 
Gen. 3. Pholas. 
Gen. Char . — The animal is an afeidia. Shell bivalve, 
divaricate, with feveral leffer differently aeceffory 
ones at the hinge. Hinges recurved, united by a 
cartilage. Beneath the hinge internally is an in- 
curved tooth. 
Species. 
daclylus. * 1. P. oblong, with reticulated, fu’ofpinous dria?, on 
the upper part. 
Five inches lon^ 
wood ; has a pholphorefeent property. 
2. P. ovate •, driated with elevated ribs ; 6 inches 
long. American feas. 
3. P. ovate, multifarioufly driated. Europe, India. 
— This fpecies feems to be nearly equally dedruftive 
with the teredo nsvalis. The pholas perforates the wood 
acrofs the grain or fibre 5 the teredo infinuates itfelf a- 
long the fibres, or in the fame direction. 
* 4. P. oblong, muricated on all fides, with decuffated 
Prise, Europe, America, Salcomb bay. 
5. P. oblong, rounded ; driae arched. America, In- 
dia. This animal penetrates the bottom of dupe. 
* 6. P. oval ; part next the hinge more obtufe, wa- 
ved, driated-, tooth of the hinge curved, large and 
o L o g y. 
fmooth, the other reticulated with Prise. Slam and 
Tranquebar. 
8. P. narrow, white, finely driated. Bay of Czm-campecki- 
peachy. _ ana • 
9. P. Ihort, turgid, furrowed, with fine elevated cordata. 
tranfverfe ftrigs ; aperture heart-thaped. 
10. P. oblong, depreffed, with didant longitudinal chilenfts. 
drise ; five inches long. Chili. 
ir. P. oblong, white, with a longitudinal brown teredula. 
granular future ; penetrates timber. Belgsc {bores 
12. P. bivalve, white, with tranfverfe arched Prim -, hians. 
convex in the middle ; aperture large, oval ; perforates 
- calcareous rocks. American iilands. 
ihoh 
2 6 
Europe. Salcomb bay, Devonfhire. 
jg 5 is found in hard clay, marl, and 
cofaia. 
ftriata. 
Candida, 
pufdla. 
er if pat a. 
drong. 
land. 
*7 
My a . 
orient alls. 7, P. oblong, with a draight margin : one half quite 
II. BIVALVE SHELLS. 
Gen. 4. Mya. 
Gen. Char . — The animal is an afeidia. The dieil is 
bivalve, generally gaping at one end. The hinge 
has broad, thick, drong teeth, feldom more than 
one, and not inferted into the oppofite valve. 
Species. 
* 1. M. ovate, truncated, gaping greatly behind ; truncate/, 
tooth projecting, obtufe ; 2|- inches long. Europe. 
* 2. M. brittle, femitranfparent, Hoping downwards declivis. 
near the open end. Hebrides. — A fi'h much edeem- 
ed as food by the inhabitants. 
* 3. M. ovate, rounded behind ; inches long. Eu- arenaria. 
ropean feas, Portfmouth. 
* 4. M. ovate ; a fingle, longitudinal, notched tooth, piRornm, 
in one hinge, and two in the other ; near 2 inches 
long, and 34 broad. Europe, Barbary, River Ken- 
net, Berklhire. — This Ihell is employed by painters for 
bolding water colours. 
* c. M. ovate, a little contracted in the middle of themargari- 
thinner margin; primary tooth of the hinge conic ; lifer a. 
length 2-|- Inches, breadth 5 inches ; inhabits mod parts 
of the arftic circle, and is mod frequently found in 
mountainous rivers, and about catarafts. — This {hell 
yields mother-of-pearl and pearl. The river Conway 
in Wales, was formerly famous for producing pearls of 
great fize and . value. They have alfo been found in 
the river Irt, in Cumberland. Sir John Hawkins ob- 
tained a patent for fidiing them in that river. 
6. M. oblong, dilated ; the narrower bafe com-psrna. 
prefied. Straits of Magellan, Barbary. 
7. M. tcngue-ffiaped ; hinge terminal, femiorbicular ; vulfella , 
4 inches long, and 1-^- broad. Indies. 
8. M. driated, valves with two fubfpinpus ridges ; arctic a. 
hinge without teeth. North feas. 
9. M. oval, equivalve, widely gaping, and driated ; edentula. 
1 inch long. Shores of the Cafpian fea. 
ic. M. equivalve, pellucid, finely driated. Rivers radiata. 
of Malabar. 
it. M. ovate, oblong ; 3 inches broad, i-J- long. oblonga . 
12. M. globular, fnowy, pellucid. Guinea. anatina. 
13. M. equivalve, fnowy, ovate, oblong; driae de- nicobarica. 
cunated. Nicobar iflands. 
14. M. ovate, compreffed, doled. New Zealand, aufralix. 
15. M. rounded, flattilh, tranfverfely driated. Ca -gaditana. 
diz. 
1 6 . M. rhombic, green, protuberant parts wrinkled .corrugate. 
Rivers of Coromandel. 
3 E 2 17. M. 
