TRTBE BRACHIOPODA. 327 



latcd, flcxuous, somewhat sinuated ventrally. Upper valve slightly 

 attenuated above, reflected and rounded ; perforation large, complete ; 

 hinge-area large, rounded ; deltidia rather large, trapezoidal, united 

 in the centre, with a distinct central groove ; mesial ridge, broad, 

 rounded, rather indistinct. Lower valve transversely obovate, slightly 

 sinuated ventrally, its dorsal edges sloping; loop elongated, doubly 

 attached. 1£. N. Zealand. 



T. Labradorensis. Sow. Th. 1, p. 362, t. 71, /. 89. 90.— Tere- 

 bratella L. Gray, Brack, p. 91. Peaked-obovate, rather thick, 

 whitish, with obtuse radiating ribs ; valves very unequal, rounded 

 ventrally, the mesial ridge indistinct ; margin crenulated, somewhat 

 flexuous. Upper valve obtusely acuminated dorsally ; perforation 

 large, entire ; hinge-area large, somewhat flattened ; deltidia rather 

 large, united. Lower valve nearly orbicular, slightly acuminated 

 dorsally: loop elongated, doubly attached. tV**!* Labrador. 



T. Rubra. — Anomia R. Pallas, Mis. Z. t. 14, /. 2, 11. — 

 A. Capensis, Gm. 3347 (from A. Striata, &c. Ch. f. 703.— 

 D. p. 292.— W. t. 11, f. 18.— T. R. Sow. Th. 1, p. 345, t. 68,/. 10. 

 — T. Capensis, Krauss, t. 2,f 10. — Kraussia R. Gray, Brack. p. 109. 

 Rounded-subquadrangular, ventricose, rather thin, deep red ; valves 

 unequally convex, the upper being gibbous, and the lower rather 

 flattened, with radiating (and for the most part simple) ribs ; margin 

 crenulated, somewhat flexuous at the ventral edge, scarcely at all so 

 at the sides. Upper valve slightly produced, obliquely truncated, 

 with a large incomplete perforation; hinge-area narrow, inclined, 

 with small deltidia. Dorsal edge of the lower valve broad, nearly 

 straight: interior with two central diverging branches somewhat 

 spread out at their extremities. ■§■... -j-. S. Africa. 1 



T. CoGKATA.—Cognata, dc. Ch. 8, p. 78, /. 688 (badly).— T. C. 

 Sow. Th. 1, p. 346, t. 68, /. 12, 3, 4.— Kraussia C. Gray, Brack, 

 p. 110. Nearly trapezoidal, rounded ventrally, pale, sometimes 

 reddish, with obsolete radiating striae, that become entirely obliterated 

 near the denticulated margin, which is flexuous both ventrally and 

 at the sides. Valves unequal, the mesial ridge* and corresponding 

 furrow inconspicuous. Upper valve convex ; its apex somewhat 

 acuminatedj reflected, with a large incomplete perforation ; hinge- 

 area narrow ; deltidia small, triangular. Lower valve flattened, its 



1 This and the next five species belong to the genus Kraussia. 

 " Transverse, with a nearly straight hinge-line ; beak truncated ; 

 foramen large; deltidia rudimentary; smaller valve longitudinally 

 impressed, furnished inside with a small forked process rising nearly 

 centrally from the septum." 



