Echinoidca, Brackiopoda, and Lamcllibranchia 



15 



BRACHIOPODA. 



THECIDEA (LACAZELLA), sp. 

 Text-figure 2. 



The ventral valve is deep, more or less conical but sometimes 

 rather irregular, and either slightly curved or nearly straight. The 

 area is large and triangular, with a raised pseudo-deltidium. On the 

 exterior of the shell are growth-ridges parallel to the margin of the 

 valve. In the interior of the valve are narrow longitudinal ridges. 



A 



B 



C 



D 



E 



G 



FIG. 2. Thecidca (Lacazella), sp. A, B, C, three views of the same specimen ; 

 D, G, a ventral valve seen from the cardinal side (D) and from the dorsal 

 surface (G) ; E, P, two dorsal valves. All x 3. 



The thin median septum is joined by a short branch on each side 

 near the cardinal margin. This valve is deeper and less curved than 

 in most examples of Thccidea vermicularis (Schlotheim), :;c but is not 

 so deep as in T. longirostre, Bosquet. | 



* For figures and references see Geinitz, Das Elbthalgeb. in Sachsen (Palffionto- 

 graphica, vol. xx., pt. 1, 1872), p. 162, pi. xxxv., figs. 35-38. Bosquet, Brach. 

 Terr. Cret. Super, de Limbourg (1859), p. 26, pi. Hi., figs. 4-11. Posselt, Brach. 

 danske Kridtformat. (Danmarks geol. Undersog., N r 6, 1894), p. 53, pi. iii., 

 figs. 23-25. 



t Bosquet, op. cit., p. 33, pi. iv., figs. 4-6 



