482 PEOCEEDINGfS OF THE GEOLOGICAL SOCIETY. [June 7, 



notice of it will be found in tlie Geological Magazine for December, 

 1864. 



"With it, and illustrating the remarkable character of the abbre- 

 viated outer cheek, was noticed, but not described, a new species of 

 Olenus which had been found at Malvern, the 0. Pecten. This belongs 

 to the section Sphcerophtlialmus of that genus. As it has been fully 

 described, and only imperfectly figured, in the Decade 11, Geol. Survey, 

 pi. 8. figs. 12, 13, there is no need to give a full description here, 

 but I figure the very perfect head in connexion with some body-rings 

 and the tail-piece (figs. 4 & 5). Both exhibit the very extreme of ano- 

 malous and extravagant characters in the appendages, and might have 

 prepared us to expect some such form as Anopolenus, in which the 

 characters of Paradoxides are reversed as regards the pleurae. 



3. On some New Species of Chxjstacea belonging to the Okdek 

 Etjrtpteeida. By Henky Woodwakd, F.G.S., F.Z.S. (of the 

 British Museum). 



(Plate XIII.) 

 Having last year visited, in company with Mr, James Powrie, F.G.S., 

 certain localities in the vicinity of Forfar, Arbroath, and Dundee, 

 noted for the occurrence of Devonian Crustacea, I am now enabled, 

 through the kindness of my friend, to describe some interesting re- 

 mains of two new species of the genus Stj/lonitrus. 



This genus was proposed by Mr. David Page in his paper read 

 before the British Association, at Glasgow, 1855, and the name was 

 published in his ' Advanced Text-Book of Geology,' 1856, where he 

 also figured and named the then only known species belonging to 

 that genus — Stylonurus Poiuriei (after its discoverer), but without 

 giving any description. 



Since that date much better materials for the illustration of this 

 genus have been afforded by the labours of Messrs. James Powrie 

 and Kobert Slimon, 



1. Sttlonitrxis Powriei, Page. 



This species occurs in the Old Red Sandstone of the Turin Hill 

 range, near Pitscandly, in Forfarshire. The most important cha- , 

 racters by which the genus is distinguished are the peculiar form of 

 the carapace, the great length of the telson or terminal joint (in S„ 

 Poiuriei one-third the length of the entire animal), and the substitu- 

 tion of two pairs of long, slender, oar-like jaw-feet, instead of the 

 single pair of broad, short natatory organs more usually met with 

 in this group. 



The impression and counterpart of ;S^. Poivriei (Page), being only 

 on sandstone, and, in all probability, the interior side of the upper 

 surface, do not afford such good material for description as the speci- 

 mens of the other species to be hereafter mentioned. 



Dimensions. — The carapace measures 2 inches 3 lines across at its 

 posterior border and 2 inches Tlines in its greatest breadth, and2 inches 

 in length. It is bordered in front by a deep groove ^th of an inch 

 from the external margin, which gradually unites with it halfwav 



