49 # 
C O N C H O L O G Y 
near tire mouths of rivers. Found 
cygnus. 
macula . 
turgid a. 
violacea. 
cuneata. 
qlauca. 
bellucida. 
fragllis. 
rugofa. 
nicobm 
• tea , 
compla- 
nata. 
I' fieri. 
piperita. 
3 * 
SDonax. 
/cor turn. 
ends. Europe, near ure moutns or rivers, 
very large on the coaft of Caermarthen, and fome parts 
of Cornwall.— The animal which inhabits this fhell, 
according to Montagu, is an afeidia 3 and he obferves 
that it frequently protrudes not lefs than 7 or 8 inches 
from the Smaller end in fearch of food. Tejl. Brit. 
p. 100. 
15. M. three-lided, finely llriated tranfverfely 3 fore- 
part flattifh and (lightly wrinkled 3 x inch long and ra- 
ther broader. Tra'nquebar. 
16. M. obtufely triangular, fmooth, thin, with pel- 
lucid chefnut fpots ; within white, and finely llriated 3 
a heart-fhaped imprefiion behind the beaks ; 1 4 inch 
long, and rather broader. 
17. M. inflated, faintly flnated, ochraceous and 
■white within •, hinge with a fupernutnerary, triangular, 
double tooth ; 2| inches long, 3A broad. Tranque- 
bar. 
18. M. thin, obfoletely radiated, finely flriated 
tranfverfely. 3 margins on each fide the beaks vhitilh 5 
2 inches long and 3 broad. Tranquebar. 
19. M. wedge-fhaped, blue, with fine tranfverfe 
Arise; margin notched within 3 1 inch long and fcarcely 
fo broad. 
20. M. ovate, dirty white with glaucous rays, and 
fine tranfverfe ftrias 3 2\ inches long, 34 broad. Me- 
diterranean. 
21. M. ovate, thin, pellucid, white, with unequal 
tranfverfe Arise 3 1^ inch long, and 2 broad. Guinea. 
22. M. ovate, thin, fmooth, pellucid, flattifh 3 an- 
terior gape tranfverfely llriated, and wrinkled. Nico- 
bar islands. 
23. M. ovate, dirty white, with elevated longitudi- 
nal Arise 3 eroding the tranfverfe ones, which arc a lit- 
tle more raifed 3 inches long, 2^ broad 3 thick, and 
white within. 
. 24. M. ovate, thin, pellucid, fmooth on the fore- 
part 3 the hind-part with cancellated Arise. Nicobar 
illands. 
25. M. ovate, thin, with arched plates 3 the plates 
tranfverfely flriated 3 no lateral teeth 3 1 inch long, 
2-|- broad. India. 
* 26. M. very thin, nearly round, whitilh 3 hinge 
with a triangular tooth, and large cavity 3 l ■§- inch 
long, and 2 broad. Common on' the thores of Bri- 
tain. Maclra comprejfa , Montagu, Tejl. Brit. p. 
96. 
27. M. ovate, compreficd, tranfverfely flriated 3 
hinge teeth very minute, with a large oblique hollow. 
Mediterranean. 
Gen. 9. Donax, or Wcdge-Jloell. 
Gen. Char. — The animal is a tethys. The fhell is bi- 
valve, ^with generally a crenulate margin 3 the ante- 
rior margin very obtufe 3 hinge with two teeth, and 
a Angle marginal one placed a little behind 3 rarely 
double, or triple. 
Species. 
1. D. triangular, heart-fhaped, with a flat frontal 
margin. Indian ocean. 
2. D. ciliated with fpines on the anterior margin. 
Indian ocean. 
Chap, IV. 
3. D. wrinkled and gibbous before, with notched rugofa. 
margins. Mediterranean and Atlantic feas. 
* 4 D. oblong, fmooth, glolfy, finely flriated \or\g\- trunculus. 
tudinally 3 margin crenated 3 an inch broad. Euro- 
pean coafls, Wales. 
5. D. obtufe before, flriated, the margin dcniic ula-Jlriata. 
ted. Southern Europe. 
* 6. D. obtufe in front, lips tranfverfely wrinkled 3 denticula- 
finely flriated longitudinally 3 margin denticulated. 
European and American feas 3 fhores of Britain, but 
rare. 
7. D. wedge-fhaped, margins very - entire 3 1 inch cuneata. 
long, 14 broad. Tranquebar. 
8. D. gibbous, finely flriated tranfverfely, fpotted fala . 
with yellow. 
9. I), ovate, compreffed, fmooth, marked with pur -feripta. 
pie waved lines 3 margins crenulate. Malabar coafls. 
10. D. ovate, ftri«: muricated 3 margin denticulat -muricata. 
ed. Indian ocean. 
* II. D. oval, with tranfverfe, waved, eredl, flriated, Irus. 
membranaceous wrinkles 3 flze of a fmall kidney bean. 
Mediterranean, fhores of Devonshire and Cornwall, 
where it is found in the hardeft limeflone. 
12. D. obtufe before, obfoletely flriated at the fides 3 levigate. 
margin very entire ; hinge without marginal teeth 3 
i£ inch long, 2 inches broad. Tranquebar. 
13. D. hind-part fmooth and perpendicularly ftriat -fpinofu. 
ed ; fore-part truncated, and finely cancellated 3 angles 
fpinous. Tranquebar. Very rare. 
14. D. flefh-coloured, anterior part truncated, wrink -ir.carnata. 
led, and marked with reticulated Arise 3 hind-part 
wedge fhaped, and furrowed with fine perpendicular 
Arise. Tranquebar. 
15. D. eval, fmooth, olive-green, within Silvery yargentea. 
margin with more elevated acute teeth, near the 
hinge. 
16. D. 'ovate with elevated Arise eroding a few bicolor. 
tranfverfe ones ; rufous with a w'hite ray on one fide. 
17. D. brown, with hyaline fpots'3 outfide with radiata. 
crowded, arched, tranfverfe Arise, infide with perpen- 
dicular ones 3 I inch broad, i-J long. Tranquebar. 
18. D. with thin perpendicular Arise, crofling th zjlraminea. 
tranfverfe ribs on the fore-part 3 ftraw colour, with 
darker tranfverfe bands 3 margin tawney and entire be- 
hind 3 1 inch long, broad. 
19. D. entirely white, with a few thin, arched , Candida. 
tranfverfe Arise, which are oblique towards the rim'3 
hinge with three oblique middle teeth 3 margin entire 3 
1 inch long, and fomet’ning broader. 
* 20. D. oblong, fmooth, gloffy, light yellow, with C ompla- 
fmall fpo's or ftreaks of white, and one broad ray of na i ttt 
the fame from the back to the oppofite margin 3 inch 
lone 
broad. 
Devonfhire, but rare. Montagu, 
Tejl. Brit. p. ic6. 
* 21. D. oblong, fuboval, fmooth, gloffy, commonly tilebeia. 
marked with two brown ftripes longitudinally from the 
beak 3 margin fmooth 3 fcarcely 4 inch long, ^ broad. 
Weymouth, Dor fetfhire. Montagu, Tejl. Brit. 107. 
Gen. 10. Venus. 
Gen. Char . — The animal a tethys 3 fhell bivalve, fron- 
tal margin flattened, with incumbent lips 3 hinge 
with three teeth, all of them approximate 3 the la- 
teral ones divergent at the tip. 
4 
33 
V enus. 
Species . 
