Vol. 69.] THE PEMBROKESHIRE COALFIELD. 267 



width, curving at its broken termination. The pedicel expands gradually 

 into a fusiform body, 5 mm. across at its broadest part, which, in a similar 

 manner, gradually contracts into a beak that is not shown in the fossil. It is 

 ornamented with very fine bands which run parallel to the long axis of the 

 fossil and present no evidence of a spiral arrangement. Both the body and 

 pedicel show to a marked degree the " central vertical suture " mentioned by 

 Mackie l and again emphasized by Mr. J. W. Jackson 2 in his description of a 

 Lancashire specimen. 



' This specimen is by far the smallest that has come to hand. The fine bands 

 or strise are similar to those of Vetacapsula johnsoni, 3 but the two differ 

 markedly in size — V. johnsoni measuring 20 mm. across. In size it approaches 

 most nearly to a specimen found by Mr. Hemingway 4 in rock below the Haigh- 

 Moor Coal at Brightside, Sheffield (now in the possession of Dr. B. Kidston) ; 

 but in that specimen the bands were much broader, being about 1 mm. in width, 

 whereas in the present specimen about four bands would be found in 1 mm. 



' It might be best to consider this as Vetacapsula sp. indet. until more 

 material is forthcoming ; or, possibly, to give it the non-committal name of 

 Vetacapsula minima. 



'With regard to the "median vertical suture," it seems to occur so per- 

 sistently in all the specimens that it is difficult to assume that it is due to 

 crushing; and it is possible that it may be found subsequently that the fossil 

 was not truly cylindrical, but that it had two, or possibly four, angles in the 

 contour of its transverse section.' 



Since the above description was written, Dr. Moysey has stated 

 in a letter :— 



' The more I think of it, the more convinced I am that it must be a new 

 species, which might be called Vetacapsiola minima.' 



IV. Pal^iobotanical Evidence as to the Horizon of the Beds. 



The following table (pp. 268-69) embodies first, the complete list 

 of the species collected from the coalfield ; secondly, it shows the 

 vertical distribution of each through the so-called 'Millstone Grit,' 

 the Lower Coal Series, and the ' Pennant Grit ' of Pembrokeshire ; 

 and, thirdly, it gives a comparison of the fossil plants with those 

 of the Upper, Transition, Middle, and Lower Coal Measures of 

 other British coalfields, in order to show the relationship of the 

 horizons met with in Pembrokeshire to the four recognized divisions 

 of the Coal Measures. 



The number of records from the beds of the so-called ' Millstone 

 Grit ' is naturally less than that from those of the Lower Coal Series. 

 Since the ' Millstone Grit ' contains a much smaller proportion of 

 shales than sandstones, well-preserved plants could only be obtained 

 from a small number of localities. Likewise, the number of records 

 from the ' Pennant Grit ' is also less than that from the Lower 

 Coal Series, the plants being obtained from a smaller number 

 of localities and horizons than those obtained from the Lower 

 Coal Series. 



1 Mackie (1865-67). 2 Jackson (1911). 



a Moysey (1910) p. 333. * Ibid. p. 336. 



