BRACHIOPODA. 
41 
88. Terebratula triquetra. B.M. 
Shell triangular, smooth, depressed, truncated in front, the 
angles produeed and rounded ; sides nearly straight ; heak ohtuse, 
recurved, keeled ; foramen moderate, round ; deltidium nearly 
concealed. Lon. 17, lat. in front 18 hues. 
Terebratula pileus, [Brug.) E. M. t. 241. f. 1. a, b, c. 
Broun, Index, p. 1245. 
Terebratula triquetra, Parkinson, 1811, Org. Rem. hi. pi. 16. f. 8. 
D’Orb. Prod. i. p. 344. 
Dav. Ann. Nat. Hist. June 1850, pi. 13. f. 21. 
Terebratula triangulus, Val. 1819, in Lam. An. s. Vert. no. 21. 
Terebratula mutica, Catullo, 1830, Geogn. Zool. x.xii. t. 2. f. 4. 
Fossil. Kelloway Rockl. France (Gigondas). 
89. Terebratula diphya. B.M. 
Shell smooth, triangular, depressed, gibbose at the margins ; 
when young two-lobed, the lobes coalescing in the adult, leaving 
a roundish opening (about 3 lines in diameter) through the cen- 
tre of both valves ; from this opening a sharp furrow passes to the 
front margin of each valve ; margins even ; sides slightly hol- 
lowed ; front indented in the middle ; angles rounded ; heak 
rounded and recurved; foramen moderate, round ; loop ?. Lon. 
19, lat. 20, alt. 9 lines. 
Concha diphya, F. Colonna, 1606, Ecphras. Stirp. 36. 49. 
Terebratula diphya. Buck, Ueber Terebrateln, p. 88. t. 1. f. 12 ; 
Mem. Soc. Ge'ol. France, hi. p. 196. pi. 18. f. 9. 
Pusch, Polens Pal. 15. t. 3. f. 13. 
Dav. Ann. Nat. Hist. June 1850, pi. 13. f. 20. 
Quenst. Handb. p. 4/0. t. 37. f. 46. 
Terebratula deltoidea, Valenciennes, 1819, in Lam. Hist. Nat. 
Brug. Enc. Meth. 1797, t. ii. pi. 240. f. 4. 
Terebratula triquetra, Parkinson (pait.), Org. Rem. hi. 229. t. 16. 
f. 4, 8. 
Terebratula antinomia, Catullo, 1827, Cat. Zool. 169. t. 5 ; 
Geogn. Zool. t. 2. f. 3. 
Terebratula Duvalhi, Newman, 1844, Zoologist, p. 679 (figures). 
Pygope diphya [Link), King, 1840, Permian Fossils, pp. 81, 144. 
Fossil. Kelloway Rockl. France. 
90. Terebratula diphyoides. B.M. 
I Shell smooth, depressed, expanded, triangulai’, perforated in 
the middle ; valves unequal, the ventral most convex ; beak 
short, with two dorsal ridges ; foramen moderate, round. Lon. 
'22, lat. 25, alt. 1 1 hues. 
