BRACHIOPODA. 
87 
Fig. 8. Dorsal valve of Terebratella dorsata. 
1. Terebratella dorsata. B.M. 
Shell broadly ovate, somewhat trilobed, whitish, radiately 
ridged, the lateral ridges more oblique than the mesial ; margins 
denticulate ; dorsal valve with a broad and shallow central de- 
pression ; beak short ; foramen very large, incomplete ; deltidia 
small, triangular, sejiarate ; hinge-area large, rather flattened ; 
loop elongated, reflected, attached to a central septum. Lon. 14, 
lat. 14, alt. 6 lines. 
Anomia dorsata, Gmelin, 1788, S. N. 3348. 
Dillwyn, R. S. i. p. 295. 
Anomia striata Magellanica, Chemnitz, Conch. Cab. viii. p. 101. 
t. 78. f. 710, 711. 
Terebratula, Lamk. E. M. t. 242. f. 1. 
D' Avila, i. t. 20. f. A. Da Costa, Elem. t. 6. f. 7- 
Terebratula dorsata, Schum. N. S. p. 133. 
Lamk. Hist. ed. 2. vh. p. 331. 
Blainv. Man. Malac. t. 51. f. 1 ; D. S. N. liii. p. 137, 145. 
Sow. Gen. Shells, f. 3 ; Thes. Conch, viii. p. 346. t. 68. f. 15, 
16, 17. 
Kiister, Conch. Cab- vii. p. 22. t. 1. f. 17; t. 2. f. 14, 15. 
Delthyris dorsata. Menke, Syn. ed. 2. p. 96. 
Hab. Straits of Magellan. 
2. Terebratella flexuosa. B.M. 
Shell wider than long, somewhat pentagonal, rather gibbous, 
pale brown, with prominent, bifurcating, radiated i-idges ; mar- 
gins sinuated and denticulated ; dorsal valve with a broad, indi- 
stinct mesial groove ; ventral valve with a short beak and a wide, 
flattened hinge-area; foramen large, incomplete; deltidia small, 
separate; loop elongated, doubly attached. Lon. 15, lat. 16 
lines. 
Terebratula flexuosa, King, Zool. Journ. v. p. 337. 
G. B. Sow. Thes. Conch, vii. p. 347. t. 69. f. 23, 24. 
Hab. Straits of Magellan. 
