ROBERTS ON THE UPPER LUDLOW TILESTONES. 119 



that substance of osseous character, supposed to belong to that Onchus, 

 the spines of which {0. Micrchisoni and 0. tenuistriatus) are common 

 in this bed. I beUeve, however, that these once supposed fish- 

 defences will settle down into spines from the trifid tail of a crus- 

 tacean ; possibly the same Ceratiocaris 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 hone 

 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 P. 

 prohlematiais 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 character is so far 

 destroyed by carbonization that little or nothing can be made of 

 them. Some of them may have had a growth in 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 Lycopodiacese, 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. 



