BRACHIOPODA. 
119 
2. Thecidium Wetherelli. B.M. 
Shell somewhat pentagonal, slightly indented in front, smooth, 
attached by the beak or whole surface of the ventral valve ; hinge- 
area narrow ; deltidium large, triangular-, elongated ; interior of 
larger valve furrowed by close, granular, longitudinal striae; dorsal 
valve with a single deep curved sinus on each side ; cardinal pro- 
cess large; margin minutely granulated. Lon. lat. 
Thecidea Wetherelli, Morris, 1851, Ann. Nat. Hist. pi. 14. f. 1-3. 
Davidson, Mon. Cret. Brack, p. 14. pi. l.f. 15-26. 
Fossil. Chalk. England (attached to shells and Echinidae). 
3. Thecidium pumilum. B.M. 
Shell nearly circular, free, ornamented with diverging, inter- 
rupted, granular ribs ; dorsal valve circular, flat, furnished in- 
ternally w-ith a broad granular border ; loop 5-7-lobed, the lobes 
augmenting regularly from the centre outwards ; central process 
granulated ; ventral valve with a produced uncinate beak. Lon. 
4. lat. 3'|, alt. 1 line (figs. 24, 25). 
Terebratulites papillatus, Schlotheim,\‘i\3,Min. TascA. vii.p. 113. 
(name only). 
Terebratula pumila, Valenc. in Lamk. 1819, Hist. Nat. 58. 
Dav. Ann. Nat. Hist. June 1850, pi. 14. f. 58 (not Sow). 
Thecidea radians, Brongn. 1825, Env. Paris, p. 325. 
Thecidee rayonnante, Def ranee, 1828, Diet. Sei. Nat. liii. p. 434. 
t. 80. f. 1. 
Thecidea radiata. Desk. Ene. Meth. iii. p. 1035. 
Lamk. Hist. ed. 2. vii. p. 346. 
Gold/. Petr. Germ. p. 289. pi. 161. f. 2. 
Thecidea papillata, Bronn, 1837, Leth. Geog. p. 633. t. 30. f. 3. 
D’Orb. Ter. Cret. p. 154. pi. 523. f. 18. 
Thecidea reeurvirostra, D'Orb. Ter. Cret. p. 156 (exclud. synon.). 
pi. 523. f. 9-17 ; Prod. ii. p. 260 (not Gerv.). 
Fossil. Chalk. Belgium ; France. 
4. Thecidium recurvirostre. B.M. 
Shell regular, oval, smooth, or only marked with concentric 
lines of growth ; free, or attached when young by tbe exti-emity 
of the beak ; beak pointed, thick, rounded and recurved ; del- 
tichum nan-ow, raised; dorsal valve deeply concave, furnished 
internally with a wide border, radiately striated ; loop unsym- 
metrical, 5-lobed, grooves deep, parallel with the margin. Lon. 
3, lat. 2, alt. I 4 lines. 
Thecidea recurvirostris, Gerville, MSS. 
Defr. 1828, Diet. Se. Nat. liii. p. 435, 
