Henry Woodivard — On British Fossil Arthrojjoda. 109 



The remaining specimens (Woodcut Figs. 2 and 3) have been re- 

 tained to represent Salter's species, which is referred provisionally to 

 M. Jordan's genus as Artliropleura mammata, Salter, sp., about the 

 affinities of which we cannot, however, at present speculate with 

 much certainty, although there are grounds for believing that 

 Artliropleura may eventually prove to be a part of a giant Arachnide ! 



In the mean time it is interesting to record the discovery, by W. 

 Gr. M'Murtrie, Esq., of Camerton, of three tuberculated epimeral 

 pieces, so exactly resembling that marked p in the accompanying 

 woodcut. Fig. 9 B, that except for the variation in the wart-like 

 tubercles, two of them might at once be mistaken for M. Jordan's 

 type. There is the same deep groove in each, the same falcate 

 border, the same admixture of large and small tubercles, upon the 

 surface of each, occupying relatively the same positions. 



The third specimen is more waved along its anterior curved 

 border, and the hinder border is straighter than in Jordan's figure. 

 They were obtained by Mr. M'Murtrie from the roof-shale of " Top- 

 Little-Yein," Camerton Collieries, and, like the Manchester specimens, 

 are from Plant-shale, and are associated with remains oiNeuropteris, 

 Pecopteris, etc. Now that its occurrence has been noted from two 

 English localities, wide apart, we may hope for further specimens to 

 turn up, throwing more light on this curious Carboniferous Arthropod. 



Species 2. — " Eu^-ypterus'? (Euplioheria) ferox, Salter; H. Wood- 

 ward, Pal. Soo. Mon., 1872, part iv. p. 171. 



Eurypterus? {Artliropleura) ferox, Salter, 1863. Quart. Journ. Geol. Soc, vol. 

 xix., p. 86, woodcut fig. 8. 



Insecta, Caterpillar ? J. 0. "Westwood, in Brodie's Fossil Insects in the Secondary 

 Eocks of England, 1845, p. xvii., p. 115, pi. i., fig. 11. 



Accompanying Mr. Salter's die^Gv'v^iiorLof Eurypterus {Artliropleura?) 

 mammatus ^ is a notice of another form named by him Eurypterus 

 {Artliropleura) ferox. The specimen described forms Fig. 8 of the 

 woodcut reproduced on p. 105 from Mr. Salter's paper, and was 

 obtained by Mr. Charles Ketley (of Smethwick) from the Clay Iron- 

 stone nodules in the shale over the " thick coal " of the Coal-measures, 

 Tipton, Stafi"ordshire, associated with abundance of fossil plants. 



Mr. Salter observes, " At first sight it would strike an entomolo- 

 gist as a fossil Caterpillar of the genus Saturnia, so strong is its 

 resemblance in size, form, and ornament to the larvee of that group. 

 Unlike most Crustaceans from the old rocks, it is extravagantly 

 ornamented with long forked spines." Such spines are found on the 

 carapace of Litliodes, and also on the segments of the abdomen of the 

 " Murray Eiver Cray-fish," Potamobius astacus. 



Mr. Salter considers von Meyer's Arthropleura armata (already 

 referred to) to belong to Eurypterus (see Woodcut, Figs. 1-7), and 

 thinks it possible to assign both his E. mammatus and E. ferox to 

 the same group. 



In a " History of Fossil Insects of the Secondary Eocks of England," 

 by the Eev. P. B. Brodie, M.A., F.G.S., Svo. published in 1845, some 



^ Quart. Journ. Geol. Soc, vol. xix. p. 86, and woodcut fig. 8, p. 84. Eeproduced 

 in this Article at p. 105. 



