102 
BRACHIOPODA. 
Waltonia differs from Terebratella in wanting the reflected 
portion of the loop ; it may, possibly, have been broken away ; 
only one minute specimen is known. 
1. Waltonia Valenciennii. 
Shell small, oval, red, smooth, with the margin fimbriated, the 
plaits radiating in front, diverging at the sides ; dorsal valve 
nearly flat ; ventral valve convex ; beak prominent ; foramen 
large and incomplete ; deltidia disunited. Lon. 2i, lat. 2, alt. 
1 line. 
Waltonia Valenciennii, Davidson, 1850, Ann. Nat. Hist. pi. 15. 
f. 1 ; 1852, p. 370. 
Hab. New Zealand (Mus. Paris). 
8. MEGERLIA. 
Shell transversely oblong, with a wide and rather straight 
hinge-line ; area distinct ; foramen incomplete ; loop rather short, 
reflected, triply attached, — once to the hinge-plate, and twice to 
the septum, by processes from the crura and also from the re- 
flected portion of the loop (fig. 16). 
Terebratula, § D, Blainv. Diet. Sci. Nat. liii. 145, 1828. 
Megerlia (truncata). King, \850, Permian Fossils, 81. 145. 
Dav. 1852, Ann. Nat. Hist. p. 369. 
Ismenia (pectunculus), King, Perm. Foss. 81. 142, 1850. 
Orthis, sp., Philippi, Moll. Sicil. 
Kingena (lima), Davidson, 1852, Mon. Cret. p. 41. f. 5, 6. 
Terebratulae expansse, Morris, 1846, Journ. Geol. Soc. p. 385. 
Terebratulie annuhferae (part.), Quenst. Handb. p. 462. 
Megerlia truncata. 
Fig. 15- 
Fig. 16. 
Fig:. 15. — Interior of dorsal valve with the animal. 
Fig. l6. — Ditto, showing the loop. 
