ROBERTS — ON THE UPPER LUDLOW TILESTONES. 
119 
that substance of osseous character, supposed to belong to that Onchus, 
the spines of which (0. Murchisoni and 0. tenuistriatus) are common 
in this bed. I believe, however, that these once supposed fish- 
defences will settle down into spines from the trifid tail of a crus- 
tacean J possibly the same Ceratiocai'is whose curious structure, as 
displayed by the Lesmahago specimens, has been still further elu- 
cidated from the Upper and Lower Ludlow beds of Leintwardine 
and Burrington (near Ludlow). So that the fragments of solid bone 
given us by this deposit will have to look out for a new alliance. 
Trimpley has been justly celebrated for its Pterygoti. The figures 
in the forthcoming Monograph by Mr. Salter (Geological Survey, 
Decade 10, pi. xiv. figs. 11, 12, 13), are taken from Trimpley 
specimens, valuable as giving portions of this remarkable Phyllopodous 
Crustacean not met with elsewhere. Pterygotus Ludensis and F. 
problematicus are the species of which I have found remains. Patches 
of the carbonized skin of Eurypterus I have also met with. 
The plant remains are abundant, but their characteT is so far 
destroyed by carbonization that little or nothing can be made of 
them. Some of them may have had a growth situ, upon the 
dimly seen shores of that ancient estuary, but of the greater portion 
of the remains we can speak but in the words of Hugh Miller, who 
describes their Scotch equivalents as being drifted from highlands of 
the period, " irregularly grooved stems, branching into boughs at 
acute angles, seeming miniature resemblances to the trunks of gnarled 
oaks and elms." There is nothing certain about them, and no special 
character visible. The spores of Lycopodiacere, however, are well 
preserved, and have such pretty polished surfaces that casual observers 
have carried away from the quarries all they could find. All that I 
have seen are identical in form. 
This ends my list of Trimpley fossils. I should be glad to learn 
the fossil fauna and flora of their equivalent beds in other districts. 
