42 



BRACHIOPODA. 



Terebratula diphyoides, D'Orb. 1847, Ter. Cret. iv. p. 87. t, 509 ; 

 Prod. ii. p. 108. 



Fossil. Neocomian. France. 



91. Terebratula ? auADRiPLECTA *. B.M- 



Shell pentagonal, with four prominent rounded ribs to each 

 valve ; ribs sometimes blending or becoming obsolete ; mai'gins 

 strongly sinuated; dorsal valve prominent in the centre, de- 

 pressed at the sides, with two subcentral and two remote lateral 

 ribs, occasionally a small fifth rib in the mesial furrow, interior 

 furnished with a prominent cardinal process having a dental pit 

 on each side ; ventral valve with two distinct or blended sub- 

 central and two lateral ribs ; beak small, laterally compressed, 

 curved, truncated by a minute apical foramen ; area small, flat, 

 triangular, bounded by prominent beak-ridges; deltidium an- 

 gular, sunk. Lon. 6, lat. 5, alt. 3i lines. 



Terebratula quadriplecta, Miinst. 1841, Beitr. Petref. iv. p. 58. 



pi. 6. f. 9, 10. 

 Terebratula quacbicostata, Braun, 1841, Id. pi. 9. f. 5. 

 Terebratula contraplecta, Braun, 1841, Id. pi. 9. f. 2 ?. 

 RhjTichonella quadriplecta et contraplecta, D'Orb. 1849, Prod. 



i. p. 203 (eiToneous). 

 Spirigera quadricostata, D'Orb. Id. p. 204. 

 Fossil. Trias. St. Cassian, Tyrol. 



92. Terebratula? TRicosTATA. B.M. 



Shell suborbicular, depressed, trilobed, smooth ; dorsal valve 

 with a prominent middle lobe bounded by shallow furrows ; ven- 

 tral valve with a deep central and obscm-e lateral furrow ; beak 

 small, acute ; foramen minute. Lon. 3, lat. 3, alt. li line. 



Terebratula tricostata, Miinst. 1841, Beitr. iv. p. 57. pi. 6. f. 7- 

 Terebratula triplecta, Klipstein, MS. 

 Spirigera tricostata, D'Orb. Prod. i. p. 204. 

 Fossil. Trias. TjtoI. 



93. Terebratula? bipartita. B.M. 



Shell oval, smooth, depressed, with a longitudinal furrow in 

 the centre of each valve ; front slightly truncated, sides depressed ; 

 beak small, prominent, ti-uncated by a small round foramen. 

 Lon. 7, lat. 5 lines {Miinst er). 



* Most of the Triassic and Palceozoic Terebratulae were probably 

 furnished with internal spires, and belong to the genera Athyris, M'Coy, 

 and Retzia, King. (Woodward, MS.) 



