120 BRACHIOPODA. 



Thecidium curvirostre, Sow. Genera, f. 4, 5. 

 Desk. ed. ham. vii. p. 349. 



Fossil. U. Chalk. France. 



5. Thecidium hippocrepis. B.M. 



Shell ovate-orbiciilai', smooth, attached by the truncated 

 umbo ; dorsal valve concave ; interior with broad striated mar- 

 gin, impressions curved, slightly digitated on their inner sides, 

 separated by a wide space. Lon. 3^, lat. 3 lines. 



Thecidea hippocrepis, Goldfuss, Petr. ii. p. 289. t. 161. f. 4. 



D'Orb. ProcZ. ii. p. 260. 

 Thecidea vermicularis, Bronn, Index, p. 1267. 

 Terebrat\dites vermicularis, Schl. Taschb. 1813, vii. 1. 113. 

 ? Thecidea prisca, Munster MS. Jura, Thurnau. 

 Fossil. Chalk. Maestricht ; Essen. 



6. Thecidium hieroglyphicum. B.M. 



Shell ovate-orbicidar, smooth, attached by the truncated apex 

 of the produced umbo ; interior of ventral valve exhibiting two 

 reniform vascular impressions in front of the retractor scars; 

 dorsal valve Hat ; internally with a broad striated border ; bra- 

 chial impression palmate, 6-lobed, converging. Lon. 5, lat. 4^ 

 lines. 



Thecidea hieroglvphica, Defrance, Diet. Sc. Nat. liii. 435. 



Gold/. Petr. U. p. 290. t. 161. f. 6. 

 Terebratula hieroglvphica, Kefst. Natg. ii. p. 68(). 

 Thecidium pumilum, G. Sow. Genera of Shells, f. 1, 2 (not Ter. 



pumila, Lamk.). 

 Fossil. Chalk. Maestricht. 



7. Thecidium digit.\tum. B.M. 



Shell irregular, smooth, attached by the truncated apex of the 

 ventral valve ; ca\nty of the ventral valve striated ; retractor im- 

 pressions large, deep and smooth ; dorsal valve transversely oval, 

 with a wide hinge-line ; internally with a broad margin, and two 

 diverging, symmetrical, palmated and 5-lobed impressions. Lon. 

 5, lat. 6 lines. 



Thecidium digitatum, G. Sowerby, Genera, no. 20. f. 3. 

 Thecidea digitata, Bronn, Lethtea, p. 664. t. 30. f. 4. 



Gold/. Petr. u. p. 290. t. 161. f. 6. 

 Thecidea Essensis, Rcemer, Kreid. p. 36. 



D'Orb. Prod. ii. p. 173. 



Fossil. U. Greensand. Westphalia. 



