274 
WORMS. TESTACEA. 66. Oftrea. 
Amtina» Shell pellucid, lamellate and laterally incurved. 
Spenghr catal. raif. tab. 6. Jig, l, 2. 
Chemn- conch. 8. tab. "jo,/. 658. tab. 71, y. 659. ludii'^ 
Inhabits Nicobar IJlatids : about an inch broad, and 
the curvature 3 inches long: its fliape in fome manner r 
bles a duck when fitting ; jftr//thin, brittle, varied with' 
and violet. 
Diluviana. Shell plaited on the outfide; the margin with ered acutah 
gular teeth. . m 
Found in a foffile ftate in the calcareous mountains ot 
about the fize of a common oyfter; the margin with 
ferratures formed as it were of the imbricate lamell* jjjts 
fhell, and tranfverfely ftriate : valves with peflinate P 
and acute wrinkles. 
Folium. Shell ovate, obtufely plaited at the Tides, parafitical. 
Barbut, tab. fig. 2. Rumffi, Muf. tab. A. 
Fetbu, Amb. tab. lO, /. I. Argenv. conch, t. 19. F. 
Klein Ojlr, tab. 8. rig. zz. Sfingl. conch, tab. 1. H. 
Knorr Fergn. 1. tah. 2'^, ftg. 2. 
Chemn. conch. 8. tab. Ji. fg- 662—666, 
, 2, Schnzt. litterat. 2. tab. \. fig. j 
Inhabits the Indian Ocean, where it is frequently found -tbii) 
to Gorgonise ; Jhell ftraw-coulour, pale tawny or violet, 
filvery : hinge with a triangular hollow ; upper-malve jnT 
the back towards the middle, wrinkled each fide and 
verfely ribbed ; lower-vahe lefs flatter and grooved 
middle. 
Orbicularis Shell orbicular, flat, with an entire crenate margin. 
Gnalt. tell. tab. 104, G. Chemn. 8. tab. 74. fig. 680 i 
Inhabits Shell with a very obtufe margin, about ' 
of the end joint of the thumb. 
•Edulis, Shell nearly orbicular and rugged, with undulate 
fcales 1 one valve flat and very entire. 
Pennant Brit. Zool. iv. tab. 62, lower figure. 
Lister An. Ang. tab. ^.fig. 26. 
Lister conch, tab. 202. fig. 36. r. 203, J. 37 * 
Bonan. recr. 2. fig. 70. Metf. Kirch. 2. f. 68. 
Gualt. ieji. tab. 102. A, B. Argent). Zoom, t. 5. A, 
Bader op.fubj. 2. tah, 8, fig. 1,2. 8, 9. 
Ginann. adr. 2. tab. i8.j5^. 127. 
Knorr Fergn. 3* tes^' fit fig- ^S'f’ 
Chemn. conch. 8. tab. 74. fig. 68z. 
2. Adanf, Seneg. l. tab, tfi- figtfi’ 
