﻿340 DR. L. MOTSEY ON FAYOLIA FROM THE [Allg. I9IO,. 



delicate ' collerette,' pierced by or possibly carrying the spines,, 

 arising from the second coarse striation, and more nearly applied 

 to the cylindrical body, which has become impressed on the body 

 during fossilization. That the ornament is not due to the 

 application to the fossil of the first-mentioned ' collerette ' is 

 proved by the fact that the encasing nodule shows the ' collerette ' 

 with its crenulate margin, projecting at an angle from the body,, 

 and at the same time a corresponding portion of the fossil shows 

 its crenulate ornamentation. It is worthy of note in this connexion 

 that in Prof. Zeiller's figure of Fay cilia grandis l an exactly similar 

 ornamentation is shown, but is not mentioned in the text. 



This specimen approaches nearer to Fayolia grandis (Renault & 

 Zeiller) than to any other described species, agreeing fairly well in 

 the size of the scars, their distance apart, and the dimensions of 

 the ' collerette.' But the fact that it is much larger, that the fine 

 striations appear to be more coarse than in the described species, 

 and also that the 4 collerette ' possesses a crenulate margin, all 

 seem to show that we are here dealing with a new species. The 

 choice of a specific name naturally falls on crenulata : thus 

 carrying on the same principle of differentiation as that adopted by 

 Prof. Zeiller in his Fayolia dentata. 



The fragment of an even larger specimen shows no special features 

 worthy of notice, and agrees so exactly with the previously described 

 specimen that there is no hesitation in ascribing it to the same species. 



"With regard to the nodule containing crushed fragments, how- 

 ever, the scars are placed much closer together, in fact they are 

 almost touching. The margin of the ' collerette ' appears to be 

 entire, and the fine striations on the valves are less marked. The 

 specimen rapidly diminishes both in width and in thickness, and is 

 evidently a fragment of a specimen nearing its basal termination. 

 It agrees closely with Fayolia sterzeliaua (Weiss), but is in too 

 fragmentary a condition for accurate determination. 



The small compressed example shows several points of interest. 

 It is spindle-shaped, 5 cm. long and 1*5 cm. broad, showing its 

 apical termination in the form of a blunt point, while its basal end 

 is truncated by the margin of the nodule. Its spine-scars are rela- 

 tively large and are placed 1 mm. apart, so that four can be counted 

 in the space of 10 mm. No details as to its ' collerette ' can be 

 distinguished, but near the apex on the left of the figure (PI. XXYII, 

 fig. 2) can be made out a sharp, finely striated, straight spine, 

 4*5 mm. long ; a little farther away can be seen the point of another 

 embedded in the matrix. The details of the fossil are obscured by 

 the presence on the same nodule of a plant-stem, and the pinnule 

 of a Sphenopterid fern. The fossil is in too imperfect a state of 

 preservation for accurate specific determination, but agrees fairly 

 closely with Fayolia dentata, Renault & Zeiller, and should pro- 

 visionally be placed near that species. 



1 ' Flore Fossile (Terrain Houiller de Comnier.try) ' pt. i (1883) pLxlii, fig. o. 



