ago 
Unguise 
* Litho- 
phaguse 
* Rugofus. 
‘WORMS. TESTACEA. 68. Mytilus. 
Born. Muf. Caf. Vind. teft. p. 121. ign. fig. A. 
Chemn. conch. 8. tab. 8. fig. 217.—721. a, b. 
Inhabits American and Indian Seas;,about 8 inches long and 
fomething broader: the infide is beautifully polifhed and 
produces the true Mother of pearl, and frequently the moft . 
valuable pearls: the outfide fometimes fea-green or cheínut 
or bloom-colour with^white rays, or whitifh with green rays ; ' 
when .the outer coat is removed it has the fame perlaceous 
luftre as the infide: the younger fhells have ears as long as 
the fhell and refemble fcallops, 
Shell roundifh longitudinally ftriate pellucid and flightly 
eared. 
Inhabits the Mediterranean. Muf, Lud. Ulr. $39. n. 331. « 
Shell very thin hyaline, with very fine perpendicular ftriz, 
about the fize of a man's nail: is probably of the genus 
oftrea, 
C. Fentricofe or convex. 
Shell cylindrical, rounded at both ends. 
Barbut, tab. Yo. fig. 5. Rumpf. Muf. tab. 46. F. 
Argeny. Conch, tab. 26. K. Zoom. tab. 7. fig. 5. 
TFobull exfang. tab. 15. fig. 18, 19. 
Bonan. recr. 2. fig. 27—29? Muf. Kirch. 2. figs 27, 28. 
Petiv. amb, aq. tab. 9. figs 13. 
Lifter conch, tab. 427. tab. 457. the laft figure. 
Gualt. test. tab. go, D. Leffer test. fg. 132. 
Born. Muf. Caf. Vind. tell. tab. 7. fig. 4. 
Chemn. conch. 8. tab. 82. fig. 729, 730. 
. Cinnamon colour. Chemn. 8. tab. 82. figs 730. 
Inhabits European American and Indian Seas, penetrating and . 
eating away corals rocks and even the hardeit marbles : about 
an inch broad and 3 long; marked with arched tranfverfe — 
fie: fhell black bay or greenifh, within opal-blue filvery-  . 
white er perlaceous, The European ípecimens have a thin 
brittle fhell; the Zndiaz ones are fofter and nearly coriaceous. 
, 
Shell rhombic oval brittle rugged antiquated and rounded - 
. at the ends.. : 
Pennant Brit. Zool. iv. tab, 63. fig. 72. 
Schrat. Eizl. in conch, 3: tab. 9. fig. Y4. a, b. 
Jnhabits Northern European Seas and lakes; and is ufually found 
- lodged in great numbers in lime ftone, each in a feparate 
apartment, with apertures too {mall for the fhell to pafs through . 
without breaking the ftone: she// about the fize of the.laft joint - 
of the little finger, dirty grey, within half blue half white, 
and marked with very finall longitudinal ftri croffing the tranf- 
verfe wrinkles. |» 
ilo 
N. 
LI 
¥ 
