‘‘“’-“ruica. 
WORMS. TESTACEA. 66. Oftrea. 277 
Shell thin ; lower- valve convex and thicker, the other flat. 
Rumpf. MuJ. tab, 46. O. Klein Oftr. tab. 8, /, 17. 
Petini, Amb. tab, 19. jig. ll. 
Chemn. esnch, 8. tab. * ’ 
2. Adanf. Seneg. I . tab. 1 4. jig. > . 
3. Cbemn conch, 9 ^tih. 116. jig. 997 * 
Inhabits the Indian and Atlantic feas, and fixes itfelf to the roots 
and flumps of trees growing clofe 10 and hanging over the wa- 
ter, efpecially the Mangifera ; varies in form and fize, but is 
often as large as the palm of the hand. 
Shell thin, the upper- valve longer and more convex. 
^norrVergn. 5. tab, t^.fig. 3,4. 
Inhabits the Adriatic, and is found fixed to other fiiells fometiraea 
alone foraetimes feveral together ; about 1 f inch long, but is 
variable as to lhape and fize ; generally whitilh, rarely yellow 
or violet. 
Shell rugged, with imbricate lamella : the margin with 
obtufely plaited teeth: the beak of one valve produced. 
Born. lUiuf. Ccef. Kind. tejt. 1. tab. J-jig- 3. 
Inhabits— —-SW/ an inch long and to lines broad, white with 
a few black fpots ; hinge with a broad conic tooth in the 
middle. 
itlenjl, Shell equivalve roundifli fmooth flat. 
Adans jeneg. i. tab. t/^.jig. 5. 
Inhabits Ihores of Senegal, and adheres to rocks; about 2 inches 
in diameter: tawny, within whitilh. 
Shell thin depreflTed rough unequal ■, the upper-valve ribbed, 
the ribs with a few fpines. 
Schreet. Einl, in Conch. 3. tab, 9. ftg. 7. a, b. 
Inhabits Guinea, and is found affixed to other bodies by the 
hinge: fometimes round fometimes oblong ; very thin, white 
with red or blucilh rays fpots or marks. 
SheU oval very thin and terminating in a lliort acute lateral 
channelled beak; with obfolete unequal perpendicular 
flrix. 
ShrcEt. Einl. in conch. 8. tab, <^.ftg. 8. 
Inhabits Shell about an inch long, brittle, whitilh, within 
glolTy filver-white ; longer ■’vad’ve exceeding the upper both in 
length and breadth. 
Shell roundilh fnowy very thin pellucid ; upper-valve ter- 
minating in a Ihort acute beak. 
Schra. 
