TRANSACTIONS OF THE SECTIONS. 103 



In a paper by Messrs. Hancock and Atthey, published in the Northumberland 

 and Dui'ham Natural-History Society's Transactions, they describe similar bodies, 

 which they found attached to patches of shagreen, and much resembling those 

 found in the Scottish beds. 



As some of the forms described by Professor Owen agree in detail with the sec- 

 tions made by himself, the author felt much puzzled at finding the different forms 

 distributed over and attached to the same shagreen ; in order to arrive at a some- 

 what satisfactory conclusion, he examined a number of the recent Rays. 



Founding on the analogy of existing rays his conclusions are : — 



1st. That the two spines of Ctenacanthus belonged to the same animal, both pro- 

 bably spines of dorsal fins, the smaller being the anterior. 



2nd. That the animal was provided with the teeth known as Cladodus of Agassiz, 



3rd. That the body of the animal was covered with fine shagreen. 



4th. That among this fine investure were scattered large structures of i)(^Mi«s of 

 authors, which stand to the shagreen in the same relation as does the placoid ar- 

 mature to the fine denticulate tubercles of existinir Rays. 



5th. That among the living forms the sexual differences are to be noticed in the 

 dermal development, differences which find their probable coimterpart in the fossils. 

 The dermal characters in the fossils are those of Rays. 



Whether the views here stated be accepted or rejected, the author hopes the 

 identification attempted may serve as a basis for further observation. 



On the distribution of shattered Chalk Flints and FlaTces in Devon and 

 Cornwall. By N. Whitley. 



On the Occurrence of Stylonurus in the Cornstone of Hereford. 

 By H. WooDWAED, F.G.S. 



The author exhibited drawings of the great Sfyhmirus Scoticus and of the smaller 

 S. Pown'ei, both which species have been obtained in a nearly perfect state in the^ 

 Old Red Sandstone of Forfarshire. 



He referred to the finding of S. Symondsii in Herefordshire, a species agreeing 

 in size with the S. Pown'ei of Forfarshire, and showed that in the new species we 

 have evidence in Herefordshire of a crustacean belonging to the Merostomata and 

 to the genus Stylonurus as large as the great S. Scoticus. The specimens (which 

 were exhibited) were discovered by Dr. M'CuUough of Abergavenny. 



On the Discovery of a large Myriapod of the genus Euphoberia in the Coal- 

 measures of Kilmaurs. By H. Woodward, F.G.S. 



The author referred to the original discovery of a Mvriapod (Xijlobius Sigillarice) 

 in the coal of Nova Scotia by Dr. Dawson in 1859*, and to its subsequent disco- 

 very by Mr. Thomas Brown in the coal-measures of Kilmaui'S, near Glasgow, in 

 1866, or earliert- 



He mentioned the discovery of a much larger form of Mjiiapod in the Illinois 

 coal-field, described by Messrs. Meek and Worthen in the ' Geology of Illinois,' 

 vol. iii. (1866), and stated that one equally fine (4 inches in length) had been foimd 

 at Kilmaurs by the late Mr. Thomas Brown, which he referred to the same genus 

 as that from Blinois (Eujihohcria), and named it, after its discoverer, Euphoheria 

 Broiotni. This new Mj^iapod, of which a specimen and drawings were exhibited, 

 like Xylohius, occurs in the ironstone-nodule bed of the Coal-measures. 



Freshivater Deposits of the Valley of the River Lea, in Essex. 

 By H. WooDWAHD, F.G.S. 

 The author based his communication upon the observations made during the 



* Quart. Journ. Geol. See. 1860, vol. xvi. p. 272. 



t H. Woodward on Xylobius, Trans. Geol. See. Glasgow, 1867, vol. ii. pt. 3. p. 234. 



