TKANSACTIONS OF SECTION C. 725 



One, E. coniciis,\s characterised by llie conical form of the body and the very large 

 eyes, which are nearer the marfrin than is usual in Eurypterus, In the other 

 species (J^. cydophthalnms), wliioh is only represented by a single specimen, two 

 inches in length, the eyes are circular and comparative!}- large, the carapace being 

 semicircular and with a distinct border. 



Stylonurus is represented by two species, also new. S. ornatus is a com- 

 paratively large form, about 18 inches in length, and is characterised by the form 

 of the carapace, whicli is horse-shoe-shaped, the possession of epimera on the 

 posterior segments and the abundance and variety of the ornamentation. The 

 second species — Stylonurus marrophthalmus — is much smaller, and the most 

 marked feature is the size of the eyes, which are half as long as the carapace. 



The third genus represented is a new one, to which I have given the name 

 Drepanopterus. The carapace in this form is somewhat of the same shape as in 

 Stylonurus, but broader in propotion to its length, measuring 3 inches by If. 

 The body is short and conical, beirg widest at the third segment. The first seg- 

 ment seems ver)^ much reduced. The ornamentation on the body is reticulate 

 rather than scale-like. Only one limb is preserved, which is 4 inches long and 

 shows the four last joints, of which the first three are subcylindrical find somewhat 

 hour-glass-shaped, decreasing in length from the first to the tliird. The terminal 

 joint is an inch long, expanded and falcate in shape, the posterior margin being 

 slightly concave and the anterior margin strongly convex. The whole limb is 

 covered with punctate markings. ThciC are traces of a second limb, which probably 

 equalled this one in size. The form of the limb seems to be somewhat intermediate 

 between Stjionurus and Eurypterus. 



Iteport of the Committee on Fossil Flnjllopoda. — See Reports, p. 298. 



3. On the Occurrence of Chonetes Pratti, Davidson, in the Carloniferous 

 Bocks of Western Auslralia. By R. BuLnEN Newtox, F.G.8., British 

 Museum {Natural History). 



In this communication the author directed attention to some valves of a 

 Chonetes recently discovered by Mr. Harry Page Woodward, F.G.S., in rocks of 

 Carboniferous age situated in the Irwin River District of Western Australia, which 

 he referred to C. Pratti, a species described and figured by the late Dr. Thomas 

 Davidson in the ' Geologist ' for 185!), plate 4, figs. 9-12, p. 116. As the original 

 description, contained only in the explanation of the plates, is necessarily somewhat 

 brief and imperfect, the following additional characters were submitted : — (1) That 

 the external surface of both valves, besides being ornamented with very fine radiat- 

 ing stria3, possess subimbricating concentric lines of growth ; (2) that the extent 

 of the cardinal margin represents the minimum width of the shell ; (3) that the 

 granular asperities on the interiors of the valves are disposed in lines as they reach 

 the margins, having more or less an elongate appearance resembling short tubular 

 spines ; (4) that the external surface of the ventral valve exhibits a number of 

 small orifices placed at irregular distances, which are probably basal attachments 

 of spines, a character known to exist in Chonetes papilionacea, C. TIardre7isis, &c. 

 The author then gave the dimensions of the Davidson type valves, together with 

 those of the "Western Australian specimens, the latter being somewhat larger. A 

 minute examination of the Western Australian specimens and their comparison 

 with the originals of C. Fratti in the Davidson collection at the British Museum 

 has demonstrated the fact that they are mineralogically as well as structurally the 

 same brachiopod. This fact is of considerable importance, as the Davidson speci- 

 mens at the time of description were unlocalised, and the species, as far as can be 

 ascertained, has never been referred to since either by Davidson himself or by any 

 other writer up to the present time. There is very little doubt that the Irwin 

 River District, besides producing this new material, yielded also the Davidson 



