^Yal1ieT — Greensand Brachiopoda» 403 



T add the following notes on the other species of Brachiopoda, 

 which have been found in this deposit. 



Terebratula pralonya, Sow. (Geol. Trans., 2nd series, vol. iv., 

 pi. xiv., fig. 14). — PL XIX., Fig. 1. This species was found not 

 uncommonly in 1867, but appears to be rare in the field that is 

 at present worked. The largest specimen that I have obtained of 

 this species measures: length, 2*08 inches; breadth, 1.08 inches; 

 thickness, 1-125 inches. 



T. Diitempleana, d'Orb. — I have obtained some specimens which 

 appear to belong to this species. 



T. MoiUoniana, d'Orb. PL XVIII., Fig. 6. — This species appears 

 to be the true T. Mouioniana, d'Orb. Mr, E. R. Lankester, in the 

 Geologist, vol. vi., p. 414, stated that he had identified a fossil from 

 the Lower Greensand of the Isle of Wight as belonging to this 

 species, which has since been described by Mr Meyer as Waldheimia 

 Morrisii, in the Geological Magazine for June (p. 268). The true 

 T. Mouioniana of d'Orb. being a Terebratula. 



The following is a translation of d'Orbigny's description of this 

 species, with which my specimens agree : — '' Shell oval, depressed, 

 elongated, narrowed, and obtuse in the cardinal region, widened and 

 truncated in the pallial region, entirely smooth, or with radiating 

 striae; superior valve (ventral valve) larger and more convex than the 

 other, much arched, with the apex strongly recurved and truncated, 

 the sides not keeled; its pallial region is slightly prominent as 

 if truncated. Inferior (dorsal) valve convex in the middle, de- 

 pressed at the sides. Foramen large, furnished with a very short 

 deltidium. Lateral commissure of the valves much arched, recurved 

 towards the base at its extremity. Pallial commissure very sinuous 

 to the middle, which is nearly straight, then elevated laterally to be 

 again depressed." This species, according to d'Orbigny, is most 

 nearly allied to T. sella, from which it differs in the want of the 

 double folds at its pallial extremity. It differs from. T. extensa in its 

 greater convexity, and the dej^ression of the sides of its dorsal valve, 

 and by its width being greater in proportion to its length. From T. 

 Meyeri, it may be distinguished by its dorsal valve being depressed 

 at the sides, and more unequally convex, by its beak being longer 

 and not so broadly truncated. It is easily distinguished by its short 

 loop from W. Morrisii, which is also a flatter shell. I have observed 

 on some few specimens traces of the stri93 which d'Orbigny states 

 occasionally occur. Deformed specimens are sometimes met with. 

 Dimensions: length, 1-3 inches; breadth, -875 inches; thickness, 

 •75 inches. 



Terebratula sella, Sow. PL XVIIL Fig. 7.— This shell abounds 

 at Upware, where several varieties are met with. I have figured one 

 of these, which occurs in great numbers in this deposit. No speci- 

 mens of this shell have yet been found in the Potton conglomerate. 



Terebratula depressa, Lamk. — The specimen here figured, PL XVIIL 

 Fig. 2, agrees in all respects with those obtained from Tournay. 

 This species attains to a very large size at Upware. I possess a 

 specimen which measures in length 2*8 inches ; breadth, 2-5 inches ; 



