* TRIBE BRACHIOPODA. 8Q7 
lated, flexuous, somewhat sinuated ventrally. Upper valve slightly 
attenuated above, reflected and rounded ; perforation large, complete ; 
hinge-area large, rounded; dcltidia 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. 13. N. Zealand. 
T. Laspraporensis. Sow. Th. 1, p. 362, t. 71, f. 89. 90.—Trre- 
BRATELLA L. Gray, Brach, p.91. Pcaked-obovate, rather thick, 
whitish, with obtuse radiating ribs; valves very unequal, rounded 
ventrally, the mesial ridge indistinct; margin crenulated, somewhat 
flexuous. Upper valve obtuscly 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. -2,...4.. Labrador. 
T. Rupra.— Anomta R. Pallas, Mis. Z. t. 14, f. 2, 11.— 
A. Caprnsis, Gm. 3347 (from A. Sraiata, &. Ch. f.-7038.— 
Dip. 293-—W ata Wey fe 8. A, Sow hs 1. p54, T08, 7-10. 
—T. Capensis, Krauss, t. 2, f.10.—Iknaussta R. Gray, Brach. 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 
erenulated, somewhat {lexuous 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. $...2. S. Africa.? 
T. Coanata.—Cognata, de. Ch. 8, p. 78, f. 688 (badly).—T. C. 
Sow. Th. 1, p. 346, ¢. 68, f. 12, 3, 4.—Knraussra C. Gray, Brach. 
p. 110. Nearly trapezoidal, rounded ventrally, pale, sometimes 
reddish, with obsolete radiating striew, 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 
acuminated, reflected, with a large incomplete perforation; hinge- 
area narrow; deltidia small, triangular. Lower valve flattened, its 

t This and the next five species belong to the genus Kraussta. 
“ 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 
ceutrally from the septum.” 
