Vol. 67.] FATTNAL HORIZONS IN THE BRISTOL COALFIELD. 329 



Three examples of A. phiUipsi were obtained from a large Upper 

 Coal-Measure pit-heap at Tyning Batch. In all of them, the shell 

 was excessively thin, with a much wrinkled periostracum. As 

 previously mentioned, the spoil-heap at Tyning Batch receives all 

 the debris from four collieries, namely, Wellsway, Middle, Ludlows, 

 and Tyning collieries : all working in the Upper Coal-Measures, 

 but not all in the same series. The difficulty of localizing the 

 fossiliferous shale is, therefore, insuperable. 



Some examples of this ubiquitous species were obtained from 

 the roof-shales of the Rock or Badger Vein, of the Second or Farring- 

 ton Series of Eadstock. The occurrence of this seam in numerous 

 collieries in the Radstock district has been elsewhere mentioned. 



A few of the examples of A. pliillipsi that have been found are 

 of comparatively large size, somewhat gibbous at the umbo, and 

 possess a much wrinkled periostracum. 



From the foregoing remarks it will be evident that Anthracomya 

 johillipsi is equally abundant in the Lower Coal-Measures of the 

 Bristol district and in the Upper Series of Eadstock. 



Horizons and localities. — Lower Coal-Measures : 

 Vicinity of the Toad Vein and 138 feet below the Bedminster 

 Great Vein, South Liberty Colliery ; roof-shales of the Easton Great 

 Vein, Easton Colliery ; and Speedwell Colliery, Kingswood. 



Upper Coal-Measures: Roof of the High Vein, Coalpit-Heath 

 Colliery ; Writhlington Colliery, Radstock ; Foxcote Colliery, Rad- 

 stock ; and the waste-heap of Tyning Batch. 



Anthracomya lanceolata Hind. (PI. XXVII, figs. 7-9.) 



This species was founded by Dr. Wheelton Hind l upon a single 

 specimen obtained at Glebe Colliery, Fenton (Staffordshire), where 

 a number of seams in the Middle Coal-Measures are worked. 

 Although Dr. Hind failed to find any other example of this species 

 in the collections that he examined, there is no doubt that it 

 is by no means a rare fossil in the Bristol Coalfield. A single 

 left valve 27 millimetres long was found in massive black shale 

 at Ludlow Colliery, Radstock, associated with A. minima. Other 

 examples occur in Lower Coal-Measure shales from the Speedwell 

 Colliery, Kingswood ; and four almost whole and uncrushed 

 examples were found upon the large spoil-heap of Upper Coal- 

 Measure shales at Tyning Batch. The latter specimens lie in a 

 fine black shale which splits very irregularly, and shows no evident 

 lamination or bedding-planes. Finally, from the roof-shales of the 

 Rock or Badger Vein in the Second or Farrington Series of Rad- 

 stock, I obtained quite a numerous suite of specimens — several in 

 very good condition and uncrushed. One of these was submitted to 

 Dr. Wheelton Hind, who confirmed my determination of the species. 

 The numerous examples collected have been subjected to a critical 



1 ' Carbonicola, Anthracomya, & Naiadites' Pal. Soc. Monogr. (1894-96) 

 p. 104 & pi. xv, figs. 11-11 a. 



Q. J. G. S. No. 267. 2 a 



