BRACHIOPODA. 
103 
The Megerlia often resemble Argiope in shape, and in having 
corresponding ribs ; the denticulation of the internal margin of 
the valves in some species may be compared with the larger mar- 
ginal processes of the latter genus. 
* Loop doubly attached. Megerlia. 
1. Megerlia truncata. B.M. 
Shell transversely oblong, or suborbicular, with a long straight 
hinge-line, horn-coloured, with very fine radiating striae ; beak 
truncated ; hinge-area flat and wide ; foramen large, incomplete ; 
deltidia minute, separate; dorsal valve nearly flat, slightly de- 
pressed in front ; interior of both valves spinulose ; loop short, 
doubly attached, and giving off from its reflected portion two ad- 
ditional processes to the central septum. Lon. 6, lat. U lines 
(figs. 15, 16). 
List. Conch, t. 462. f. 23. 
Anomia truncata, Linn. S. N. 1152. 
Born, Mas. 118. t. 6. f. 14. 
Chemnitz, Conch. Cab. viii. 90. t. 77- f- 701. 
Gmelin, S. N. 3343. 
Dillw. R. S. i. p. 292. 
Poli, Test. Sicil. p. 191. t. 30. f. 16, 17. 
Pallas, Misc. Zool. t. 
Terebratula, Lamk. E. M. t. 243. f. 2. 
Terebratula truncata, Retz. Nov. Gen. p. 14. 
Lamk. Hist. vi. p. 247 ; ed. 2. vii. p. 333. 
Sow. Thes. Conch, vii. p. 354. t. 71. fr 64-67- 
De Buck, Mem. p. 66. 
Blainv. D. S. N. hii. p. 139. 
Philippi, Moll. Sicil. i. p. 95. t. 6. f. 12. 
Quenst. Handb. p. 462. t. 37. f. 10. 
Terebratella truncata, D’Orb. Ann. Sci. Nat. 1848, viii. p. 66. 
t. 7. f. 11, 12, 16, 37. 
Terebratula monstrosa, Scacchi, Oss. Zool. ii. p. 1. 
Anomia disculus, Pallas, Misc. Zool. p. 184. t. 14. f. 1 (1766). 
Terebratula (D.) disculus, Blainv. D. S. N. liii. p. 138. 
Orthis truncata, Philippi, Sicil. ii. p. 69. 
Megerha truncata, King, 1850, Permian Fossils, 81. 145. 
Dav. Ann. Nat. Hist. 1852, p. 369. 
Terebratula oblita, Michelotti, Brach. p. 4. 
Orthis oblita, Mich. Faun. Mioc. pi. 2. f. 21. 
