BRACIIIOPODA. 121 



S. ThECIDIL'M RUGOSUM. 



Shell irri'friiliir, nttiiclicd by tlie trnnciitcd apex of the ventral 

 vnlve ; vi-iitnil valve striated leiij^tliwise and squaniose with lines 

 of growth ; dorsal valve round, slightly truncated by the hinge- 

 line, sniootli, furnished internally with a granulated margin and 

 two .'J-l()l)ed impressions, the lobes straight and diminishing in 

 length inwards. Lon. 2J hues. 



Thecidea rugosa, irOrblqny, 184/, Ter. Cr^t. p. 153 (" T. hippo- 

 cr<>/)iA-")pl. 5J2.f. S-i4. 



Fossil. V. Greensand. France. 



!>. THECIDIIM TETR.VGONUM. 



iShell roundish, attached by the truncated apex of the ventral 

 valve, smooth, with obscure lines of growth ; hinge-line wide ; 

 ventral valve witli two, nearly symmetrical pahnate, 4-lobed im- 

 pressions, the right side largest. Lon. 2\ lines. 



Thecidea tetragona, Ra-mer, 1839, Ool. t. 18. f. 4. 



D'Orb. Ter. Cret. iv. p. 152. t. 522. f. 1-/. 

 Fossil. Neocomian. Hanover; France. 



10. Thecidium Moreanum. 



Shelf minute, rounded, trigonal, equilateral, with an acute 

 apex ; dorsal valve convex, concentrically substriated, tubercu- 

 lated near the front margin ; ventral valve attached by its whole 

 breadth, area triangular, interior with a longitudinal ridge. Lon. 

 and lat. i. line. 



Thecidea Moreana, Buvignier, 1852, Geol. de la Meuse, p. 26. 



pi. 20. f. :i0-32. 



Fossil. Coral Rag. France. 



10*. ? Thecidium Corallinum. 



She'll like T. antiqua, but triangular, and much narrower at 

 the hinge-line. 



Thecidea Corallina, D'Orbigny, 1850, Prod. ii. p. 25. 

 Fossil. Coral Rag. France. 



11. ? Thecidium cordiforme. 



Shell oval ; beak pointed ; front bilobed. 

 Thecidea cordiformis, D'Orbigny, 1850, Prod. i. p. 344. 

 Fossil. Kelloway Rock ? France : attached to Ammonite!;. 



G 



