Walker — Oreensand Brachiopoda, 405 



Waldlieimia tamarindus, Sow., var. magna. Plate XIX., Figs. 9 and 

 10. — This species varies considerably in form. Some specimens are 

 more globose than others ; some assume a somewhat pentagonal 

 shape. Most of the varieties found in the Isle of Wight occur at 

 Upware, but the nature of the latter locality appears to have been 

 favourable to their greater development. Mr. E. E. Lankester 

 and Mr. Meyer having kindly given mo numerous specimens 

 of this species from the Isle of Wight, I have been enabled to 

 compare them with the Upware specimens, which to differ only 

 in their larger size. I have figured two forms. Dimensions of figured 

 specimens: length, 1*04 inches and 1"08 inches; width, '97 inch; 

 thickness, '69 to '63 inch. This species is the one which occurs at 

 Potton, in the greatest abundance, where it attains its greatest size. 



Waldheimia celtica, Morris. — I am not certain that any true 

 specimens of this species have yet been found at Upware, but I 

 have one or two which somewhat resemble it. 



Waldheimia 'pseudo-jiirensis, Leym. PI. XVIII., Figs. 8, 9, 10, 

 and 11. — The sj)ecimens which I have referred to W. pseudo-jurensis, 

 have recently been found at Upware, in considerable abundance. 

 This species varies in thickness, shape of the front margin, etc. 

 The specimens appear to agree closely with Leymerie's figures. 

 Mr. Meyer informs me that he has found specimens of a shell some- 

 what resembling this at Godalming, but he had referred it to T. 

 Bouhei, d'Arch. I have figured two or three varieties. Dimensions : 

 length, -875 inch to 1 inch ; breadth, -625 inch to -66 inch ; thick- 

 ness, -44 inch to "5 inch. 



Waldheimia? Davidsoni, nobis. (Geol. Mag. Vol. IV., p. 454, 

 PI. XIX., Fig. 4.) — Mr. Meyer informs me that he has found 

 specimens of this species at Godalming, in Surrey. He has 

 succeeded in obtaining a good view of the loop, and says that it 

 is doubly attached, " but differs slightly from the ordinary form of 

 Terehratella, in that the extremity of the reflected portion of the 

 loop almost touches the septum." The species will, therefore, pro- 

 babl}^ have to be named Terehratella Davidsoni. 



Terehratella Fittoni, Meyer. — This shell is extremely abundant at 

 Upware. It varies in form, in the degree of convexity of the dorsal 

 valve, in the beak being more or less recurved, and in the fineness 

 and closeness of its ribs. The Godalming specimens appear to be 

 generally more coarsely ribbed than those from Upware. 



Bhynchonella. — Of this genus, I have identified the following 

 species : — B. Gihhsiana, Sow. ; B. parvirostris, Sow. ; B. depressa, 

 Sow. ; B. antidichotoma, Buv. ; B. lata, d'Orb. 



I have arranged them in the inverse order of their rarity. At 

 Potton B. antidichotoma and, I think, B. depressa and B. lata occur. 



Besides these species which I have determined, there are some 

 doubtful forms. This bed is indeed very remarkable for the number 

 of species, and also for the abundance of individual specimens found 

 in it; the latter circumstance is associated with very considerable 

 amount of variation, and the specimens generally attain a large size. 

 This is due, no doubt, to the nature of the deposit, as a large supply of 



