250 
WORMS. TESTACEA. 65. Arca. 
Knorr. Vergn. 1. tab. 25. fig. 3. 
Martin. Befch. Naturf. 3. tab. 6. fige V4. 
Chema. conch. 7. tab. 83. fig. 524» 525* 
Inhabits the Indian Ocean and is extremely rare. 
Shell white, fometimes with brownifh {pots or clouds, thrice as 
broad as it is long; the infide ftriate, the outlide ftriate in 
various directions; valves difimilar: margin crenate within, 
and in younger fhells without alfo. 
B. Margin entive: beaks inflected. 
* Nor. — Shell oblong ftriate and emarginate at the tip: beaks very 
x] 
remote: margin gaping. Neah’s Ark. 
Arca tortuofa. Pennant Brit. Zool. iv. p. 97. 
Berlafe Nat. Hifl. Cornwall tab. 28. fig. 15, 166 
Barbut. ta). 7. fig. 2. Lifter. t. 368, 369. 
Rumpf. Muf. tab. 44. P. Gualt.test. tab. 87. G,H, I. 
Adans, feneg. Y, tab. 18. fig. 9. Leffer test. fig. 138. 
Donan. recr. 2. fig. 32. Muf. Kirch. 2. fig. 51. 
Petiv. amb. tab. 17. fig. 10. Argenv. conch. tab. 23. Ge 
Knorr. delic. fel. tab. B. v. fig. 2, 
Knorr Vergn. 1. tab. 16. fig. 1, 2. 
Regenf. conch. V tab. Y2. fig. 73 
Chenin. 7. tab. 530 fig. 529--5 310 t 64. f. 5325 533s 
- Argenville conc! sta’. 29. fige20.A 
Inhabits the Mediterranean Atlantic and American Seas. 
Shell rhomboid, white. generally fpotted clouded ftriate undulate 
or veined with brown or yellow ; outer margin crenate, the 
inner entire. 
*Barbata. Shell oblong ftriate, bearded with byffus: beaks approx. 
u 
IAN] 
imate: margin clofed. 
Lister conch. tab. 231. Knorr Vergn. 2. tab. 2. fige 7. 
Benan. recr. 2. fig. 79» Muf. Kirch. 2. fig. 78. 
Gualt test, tab. 9. F. Argenv. Conch. tabs 72. Me 
Murray. testaceol, tabs 2. figo 22. 
Martin Befch. Naturf. 3. tab. 6. figs 8» 
Chemn. conch. 7. tab, 54. fig $35» 
» Gualt. test. tab. 9o. ig, B. 
Martin Belch. 3. tab. 0. fig. 12. 
CLemn, conche 7. tate 54. fe 5346 
» Seba Mu. 3. fe 88. f. I2, My. tef. te 6. 2 To 
Chen. conth» 7. 1. $4» fo $3605 5370 
« Rumpf. Muf. te 44» f. Le 
Inhabits Exropean American and Indian Seas, ] 
Skhe/t pale chefnut under the by flus, fometimes mixed with white, 
and marked with decuflate ftrim: the fibres in the angle of 
fe&ion are nodulous, 3 
c Modiolus, 
