BRACHIOPODA. 



101 



Fig. 13 

 i 



Bouchardia tulipa. 



Fig. M. 



f 



Fip. 13.— Interior of dorsal valve: j. cardinal process ; p. hinge-plate; /. loop; 

 s. septum. 



Fir. II.— Interior of ventral valve: /. foramen; t. teeth; «, adductor scar: 

 p. peduncle scars ; r. retractor scars. 



The great muscular impressions in Producta, which correspond 

 to these retractor scars, have been mistaken for points of attach- 

 ment of the peduncle. 



I. Bouchardia tclipa. 



B.M. 



Shell oblong-oval, rather depressed, thick, smooth, pale rosc- 

 red, with darker rays ; margins even ; beak rather produced, 

 straight ; perforation very small, entire ; hinge-area rather wide ; 

 deltidia united; dorsal valve oval, Hattish ; cardinal fulcrum 

 (figs. 13, 14). 



Terebratula tulipa, Blainv. Diet. Sci. Nat. liii. 144, 1828. 

 Terebratula rosea, Mawe, Introd. Conch, t. . f. 



Sow. Gen. f. 4 ; Thes. Conch, vii. p. 357. t. 71. f. 74-77. 



Desk, in Laink. Hist. ed. 2. vii. p. 350. 



Kinf/, Ann. S,- Mag. N. H. xviii. 34. 38. 1846. 

 Pachyrhynchus rosciis. King, Permian Fossils, p. 70. 

 Bouchardia rosea, Davidson, Bull. Soc. Ge'ol. France, 1849, pi 1 



f. i-(;. ^ 



King, Permian Fossils, p. 81. 

 Hab. Brazil (Rio, 13 fathoms, J. M'Gillivray). 



7*. WALTONIA? 



Shell oval, smooth, jnmctate ; valves conve.\ ; margins si- 

 nuated ; beak truncated by a large, incomplete foramen ; deltidia 

 separate ; loop reduced to two simple lamellae, furnished with 

 oral processes, and attached to a prominent central septum. 



Waltonia (Valenciennii), Dav. 1850, Ann. Nat. Hist. v. p. 475 ■ 

 1852, p. 372. 



