28 



BRITISH OOLITIC AND LIASIC BRACHIOPODA. 



2d Section. 



Loop simply attached 

 to crura, and extending 

 to less than half the 

 length of the valves. 



Beak uncompressed late- 

 rally, beak ridges soon be- 

 coming more or less in- 

 distinct; surface smooth 

 or incompletely plicated. 



"Terebratula punctata. 



v. 





— 



subpunctata. 





— 



indentata. 



1 



— 



Buckmanii. 



7 



— 



Lycettii. 





— 



insignis. 



1 



— 



simplex. 



1 



— 



ovoides. 





— 



maxillata ; var. submaxillata 





— 



perovalis. 





— 



intermedia. 





— 



Phillip sii. 





— 



globata. 





— 



bucculenta. 





— 



sphaeroidalis. 





— 



globulina. 





— 



pygmia. 



? 



— 



Bentleyii. 





— 



coarctata. 





— 



plicata. 





— 



fimbria. 





— 



flabellum. 



f 1 : 



21. Terebratula quadrifida, Lamarck. Plate III, figs. 8 — ]0. 



Terebratula quadrifida, Lamarck. 1819. Anim. sans Vertebres, vol. vi, p. 35. 



— — Deslong champs. Soc. Lin. de Normandie, 1837. 



— — V. Buch. Mem. Soc. Geol. de France, vol. iii, p. 190, 



pi. xvii, fig. 3, 1838. 



— — Bronn. 1849. Index Palseont., p. 1247. 



— — If Orb. 1849. Prodrome, p. 240. 



— — Dav. Annals and Mag. of Nat. Hist., vol. v, 2d Series, 



pi. xiv, fig. 35. {Notes on an examination of Lamarck' 1 s 

 Fossil Terebratula.) 



Diagnosis. " Testa triangulari-depressd, dilatatd Icevi superne quatuor angiitis acutis 

 instructd, nati brevi." (Lamarck.) 



Shell inequivalved, broader than long, irregularly pentagonal, depressed, variable ; 

 valves almost equally and slightly convex, with four rounded ridges, extending from the 

 umbo and beak to the front, and three corresponding sinuses on each valve ; the hinge 

 margin is convex, extending to a considerable distance, and forming nearly half the 

 circumference of the shell, the remaining portion being well nigh equally divided into 

 three concave portions; beak small, with acute lateral ridge, continued along the side, 

 without recurving to join the hinge-margin, forming a well-defined marginal and false 

 area ; beak slightly compressed, foramen entire and of moderate size, separated from the 

 umbo by an obtuse triangular deltidium in two pieces. Loop of imperforated valve simply 



