1862.] SALTER CRUSTACEA. 847 



some formerly obscure points in its structure, and proceeded to de- 

 scribe the E. Scouleri, Hibbert, from the Carboniferous limestone 

 of Scotland, and the Upper Old B,ed Sandstone of Kilkenny ; the 

 E. {Arthrojpleura) mammatus, a new species from the Upper Coal- 

 ineasures near Manchester ; and E. ? {Artliropleura) ferox, sp. nov., 

 from the Coal-measures of North Staffordshire, 



5. On Peltocaris, a netu Gezstus of SiLURiAisr Crtjstacea. 

 By J. W. Salter, Esq., F.G.S., &c. 



(Abstract.) 

 [The Publication of this Paper is unavoidably deferred,] 



Of this form an imperfect individual, from the anthracite-shales 

 (Llandeilo-flags) of Dumfriesshire, was formerly described by the 

 author as Dithyrocaris ? aptychoides. Better specimens have enabled 

 him to distinguish it as a new generic form, still belonging to the 

 Phyllopods, not far removed from Hymenocaris and Dithyrocaris. 

 A fragment of another larger form, from the same locality, is de- 

 scribed by the author as Peltocaris ? Harhnessi. Mr. Salter also 

 explained his views of the relationship of the palaeozoic Phyllopoda 

 among themselves and with the recent forms, and illustrated them by 

 a diagram in which they were arranged in chronological succession. 



6. On a Crtjstacean Track in the Llakdeilo Flags of Chirbury, 

 Shropshire. By J. "W. Salter, Esq., F.G.S., &c. 



(Abstract.) 

 [The Pubhcation of this Paper is unavoidably deferred.} 



This track consists of numerous, short, narrow, oblique, chisel - 

 shaped imprints, on the ripple-ridges of the slab ; and, according to 

 the author, it must have been caused by a large undescribed Crusta- 

 cean with a bifid or two-pronged tail. To a like agency, but to a 

 distinct genus, Mr. Salter refers some curious markings described by 

 M. Brebisson as occurring in the Lower Silurian sandstone of Noron 

 in the Falaise (Normandy). 



June 4, 1862. 



The Rev. David Honeyman, Antagonish, Nova Scotia, and Alex- 

 ander Macdonald, Esq., Aberdeen, were elected Fellows. 



The following communications were read : — 



