﻿CRETACEOUS BRACHIOPODA. 



51 



laterally the shell presents a pinched-in appearance, the margin being flexuous and 

 curved in front. Surface smooth, marked by concentric lines of growth : loop long 

 extending to within a short distance of the front before becoming reflected. 

 Length 12, width 9, depth 7 lines. 



05s. In 1870 Mr. Walker found it necessary to alter the name he had originally 

 given to the species to that of Juddii, from its having been discovered that the designa- 

 tion of rhomboidea had been previously applied by Biondi in 1855 to an Italian Tertiary 

 species. Its nearest allies are Wald. Morrisi and W. tamarindus ; but from both of 

 these it seems distinguishable by its more elongated form, as well as by the pinched-in 

 appearance of the frontal portion of the shell. Internal casts show a deep slit in the 

 dorsal valve, extending to a little in advance of one third of the length of the valve. 

 The loop is similar to that of W. Morrisi. 



Position and Locality. — Very abundant in the Lower Greensand at Upware ; Mr. 

 Meyer found it at Godalming associated with T. externa, and also in the Sponge-gravel 

 at Faringdon. 



65. Waldheimia Wanklyni, Walker. Sup., PI. VII, figs. 22 — 28. 



Waldheimia mutabilis, Walker. Geol. Mag., vol. v, p. 400, pi. xix, figs. 4, 5, 1868; 



and vol. vii, p. 562, 1870. 



Spec. Char. Much elongated, oval ; valves moderately convex, somewhat flattened, 

 with hardly any fold or sinus, deepest and most convex near the umbo ; greatest breadth 

 of the shell about the middle, tapering towards the extremities. Beak short, slightly 

 rounded, and truncated by a rather small foramen, separated from the hinge-line by a 

 wide deltidium in two pieces ; beak-ridges sharply defined, leaving a flattened space 

 between them and the hinge-line ; front margin nearly straight, edges sharp. Surface 

 smooth, marked by concentric lines of growth. Loop long. Two specimens measured : 

 Length 21, width 15, depth 7 lines. 

 >> 21 „ 17 „ 7 ,, 



Obs. Mr. Walker describes what he considers to be two varieties of this species 

 under the designations of var. ellijjtica and var. angusta. The first (figs. 22 — 25) is the 

 largest and most ovate ; the second (figs. 26 — 28) very much elongated and narrow, 

 when compared with its length ; but they seem to merge one into the other. A very fine 

 series of specimens may be seen in the Woodwardian Museum, Cambridge. 



Position and Locality. This species occurs in the Lower Greensand at Upware, and 

 has likewise been found by Mr. Meyer in the "Eolkstone beds" at Shanklin and 

 Godalming, also in the Sponge-gravel at Faringdon. A specimen of the var. angusta in the 

 Woodwardian Museum shows that the loop was exactly similar to that of the var. elliptica. 



