92 brachiopoda, 



17- Terebratella Vanuxemiana. 



Shell suborbicular, ornamented with unequal radiating ribs ; 

 each valve with a central furrow, bordered by more prominent 

 ribs ; beak not prominent ; area widely triangular ; foramen 

 large ; deltidium incomplete. Lon. 8, lat. 7, alt. 4 hues. 



Terebratula Vanuxemiana, Forbes, 1844, Proc. Geol. Soc. p. 308 



(figiu-ed). 

 Terebratella Vanuxemiana, D'Orb. Prod. ii. p, 259. 

 Fossil. Chalk. New Jersey, U.S. 



18. ? Terebratella Parisiensis. 



Shell small, round, very inequivalve, ornamented with broad, 

 keeled, dichotomising ribs. 



Terebratella Parisiensis, D'Orbigny, 1850, Prod. ii. p. 259. 

 Fossil. Chalk. France. 



19. Terebratella spathulata. B.M. 



Shell smooth, with concentric lines of growth ; ventral valve 

 semicircular, strongly curved, ti-uncated at the hinge-line, toothed 

 at the angles ; dorsal valve nearly flat, smooth, oblong, rounded 

 in front ; hinge-line straight, as wide as the shell ; dental sockets 

 at the angles of the hinge-line ; cardinal process obtuse ; hinge- 

 plate broad, divided into four concave spaces ; median septum 

 narrow ; loop (indicated at the hinge and septum) doubly at- 

 tached. Lon. 10-15, lat. 10-12, alt. 8-10 lines. 



Anomites spathulatus, Wahlenberg, 1821, Act. Ups. viii. p. 62. 



t. 4. f. 10, 11. 

 Terebratula spathulata, Nilsson, Petr. Suec. p. 35. t. 3. f. 15. 



Bronn, Index, p. 1251. 

 Rhynchora spathulata, Dalman, 1828, Vet.Akad. p. 136. 



Hisinger, Leth. Suecica, t. 20. 

 Fossil. Chalk. Sweden; Belgium. 



20. Terebratella Davidsoniana. B.M. 



Shell wedge-shaped, semicircular, truncated at the hinge-line ; 

 surface ornamented with lines of growth and rachated with ])ro- 

 minent punctations ; dorsal valve flat, with a narrow mesial fold ; 

 hinge-line straight, bordered by a plate with four cavities (for 

 the pedicel-muscle) and with a small dental pit at each angle ; a 

 single prominent septum in the middle : ventral valve a simple 

 bent plate, with a narrow mesial groove externally, a slight mus- 

 culai' ridge inside, and a tooth at each angle of the hinge-line. 

 Lon. 4, lat. 6 lines. 



