BRACHIOPODA. 
57 
front slightly elevated ; sides depressed ; beak short, tapering ; 
foramen large, incomplete ; deltidia large, separate ; loop small, 
annular. Lon. 10, lat. 10, alt. 4 lines. 
Terebratula substriata, Schl. 1820, Petr. p. 283. 
Buck, Ter. 60. 
D’Orb. Prod. i. p. 377- 
Quenst. Handb.yt. 461. t. 37- f. 6, 7- 
Terebratula striatula, Zieten, 1830, Wurt. p. 59. pi. 44. f. 2 (not 
MantelT). 
Terebratulina substriata, Davidson, Ann. Nat. Hist. 
Fossil. Oxford Clay. France ; Germany. 
3. WALDHEIMIA. 
Shell ; foramen complete ; loop elongated and reflected ; me- 
dian septum of the smaller valve elongated. 
Waldheimia (australis), King, 1849, Permian Fossils, p. 81. 
Terebratulae with long loops, Dav. 1852, Ann. Nat. Hist. p. 364. 
Terebratulaj cinctse et carinatae (part.). Buck. 
The extent of the septum may be readily ascertained in fossil 
species by a little acid, without injuring the specimens. 
The sections into which Waldheimia has been groujted depend 
entirely upon modifications of external form. 
Waldheimia favescens. 
Fig. 6. — Interior of dorsal valve with the animal. 
Fig. J . — Section of both valves with the animal ; the muscles of the peduncle arc 
not represented. 
a, n\ adductor muscle; /. retractor muscle; p. peduncle; /. cardinal p^oce^s 
t. dental sockets ; m. mouth; r. position of intestine. 
D 5 
