nUACIUOI'ODA. 71 



c. Beak InternUy keeled; dorsal valve with a loiujitudiual depres- 

 sion in the centre. 



TiTihratiilji- Ciirinatir iiciit;r, Bnrli. 



Teiebratula; ImpicssiL-, Queiist. 1851, lland/j. p. IGO. 



4'K W.Vr.DllEIMIA IMl'RESSA. B.M. 



.S'/(r// siihcircviliir. polislied ; siiialk'r valve flat, depressed in the 

 middle in front ; ventral valve eonvex ; luak reeurved, witli la- 

 teral ridtres; foramen minute ; deltidiuni double ; loopelouf^ated, 

 reflected, lamella very broad ; septum nearly as long as the 

 valve. Lon. I* or 10, lat. 9, alt. 5 lines. 



Terebratula inipressa, Buck, 1832, Ueber Terehrateln, M6n. Soc. 

 Ge'ol. France, I ser. \). 22(i. pi. 20. f. /, 1838. 

 Ziefen, l\"urt. Verst. \). 53. pi. 3!). f. 11. 

 Daridsoii, Mon. Ool. Brack, p. .33. pi. 4. f. 8-10. 

 Quenst. Uandb. p. 4()8. t. 3/. f. 36, 3?. 

 Fossil. Inferior Oolite. Dorset ; Cheltenham. 



Oxford Clay. Huntingdonshire ; Germany. 



50.? Waluheimia Beknardixa. 



" Shell like T. pala, but oval-obround, truncated in front, 

 enlarged in the middle; small valve much depressed, with a 

 furrow in the middle." 



Terebratula Beniardina, D'Orb. 1850, Prod. i. p. 377. 

 Fossil. Oxford Clay. France. 



51. ?Waldheimia labiata. 



Shell smooth, round or oval, depressed, truncated in front, or 

 with the front of the little valve sunk, foiming a deep sinus in 

 the larger valve. 



Terel)ratula labiata, D'Orb. 1850, Prod. i. p. 377. 

 Fossil. Oxford Clay. France. 



.52. ? Waldheimia Chauviniana. 



Shell oblong; obtuse in front; beak pointed; small valve 

 nearly flat, the other ventricose. 



Terebratula Chauviniana, D'Orb. Prod. i. p. 344. 

 Fossil. Kelloway Rock ? France. 



