102 



BRACHIOPODA. 



Waltonia differs fi-om 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. 2\, lat. 2, alt. 

 1 hne. 



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 shoit, 

 reflected, triply attached, — once to the hinge-plate, and twice to 

 the septiun, by processes from the crura and also from the re- 

 flected portion of the loop (tig. 16). 



Terebratula, § D, Blaiiiv. Diet. Sci. Nat. liii. 145, 1828. 

 Megerlia (truncata), Kint/, 1850, Permian Fossils, 81. 145. 



Dav. 1852, Ann. Nat. Hist. p. 3().9. 

 Ismenia (pectunculus), King, Perm. Foss. 81. 142, 1850. 

 Orthis, sp., Philippi, Moll. Sicil. 



Kingcna (lima), Davidson, 1852, Mon. Cret. p. 41. f. 5, 6. 

 Terebratulffi expanse, Morris, 1846, Journ. Geol. Soc. p. 385. 

 Terebratulae annuhferae (part.), Quenst. Handb. p. 4()2. 



Fig. 15. 



Megerlia truncata. 



m 



Fig. 16. 





Fig. 15. — Interior of dorsal valve with the animal. 

 Fig. l6. — Ditto, showing the loop. 



