BRACHIOPODA. 
121 
8. Thecidium rugosum. 
Shell irregular, attached by the truncated apex of the ventral 
valve ; ventral valve striated lengthwise and squamose with lines 
of growth ; dorsal valve round, slightly truncated by the hinge- 
line, smooth, furnished internally with a granulated margin and 
two 3-lobed impressions, the lobes straight and diminishing in 
length inwards. Lon. 2^ hnes. 
Thecidea rugosa, D'Orbigny, 1847, Ter. Cre't. p. 15.3 (“ T. hippo- 
crepis ”) pi. 522. f. 8-14. 
Fossil. U. Greensand. Franc^ 
9. Thecidium tetragonum. 
Shell roundish, attached by the truncated apex of the ventral 
valve, smooth, with obscure lines of growth ; hinge-line wide ; 
ventral valve with two, nearly symmetrical palmate, 4-lohed im- 
pressions, the right side largest. Lon. lines. 
Thecidea tetragona, Ramer, 1839, Ool. t. 18. f. 4. 
D'Orb. Ter. Cre't. iv. p. 152. t. 522. f. 1-/. 
Fossil. Neocomian. Hanover; France. 
10. Thecidium Moreanum. 
Shell minute, rounded, trigonal, equilateral, with an acute 
ajiex ; dorsal valve convex, concentrically substriated, tubercu- 
lated near the front margin ; ventral valve attached by its whole 
bi’eadth, area triangular, interior with a longitudinal ridge. Lon. 
and lat. i line. 
Thecidea Moreana, Buvignier, 1852, Ge'ol. de la Meuse, p. 26. 
pi. 20. f. 30-32. 
Fossil. Coral Rag. France. 
10*. ? Thecidium Corallinum. 
Shell like T. antiqua, hut triangular, and much narrower at 
the hinge-line. 
Thecidea Corallina, D’Orbigny, 1850, Prod. ii. p. 25. 
Fossil. Coral Rag. France. 
11. ?TheCIDIUM CORDIFORjME. 
Shell oval ; beak pointed ; front hilobed. 
Thecidea cordiformis, D'Orbigny, 1850, Prod. i. p. .344. 
Fossil. Kelloway Rock ? France ; attached to Ammonites. 
G 
