1863.] SALTER — CRUSTACEAN FROM GLASGOW. 519 



the deltidium (e), which is rather prominent, may be said to occupy 

 a little more than the middle third of its surface. It only remains 

 to be remarked that the originally attached part in all my specimens 

 is indicated by a longitudinal groove on the inferior surface of 

 the ventral valve, — being evidently moulded upon a stem or branch 

 of some dendritic animal or algal form (fig. 1), and often extending 

 to within a third of the anterior margin. I have named the species 

 after my friend Dr. Leith Adams, of the 22nd Regiment, who first 

 pointed it out to me in an evening ramble. 



5. On the Sandstones and Shales of the Oolites of Scarborough, with 

 Descriptions of new Species of Fossil Plants. By J. Leckenby, 

 Esq., F.G.S. 



[The Publication of this Paper is deferred.] 



(Abstract.) 



The true position of the well-known Plant-bed at Gristhorpe Bay, 

 below the grey limestone, was first pointed out by Prof. Williamson, 

 and afterwards by Dr. Wright ; and Mr. Leckenby showed that all 

 the Plants hitherto referred to the Upper Sandstone, Shale, and Coal 

 belong to the Lower Sandstones and Shales, but few Plants having 

 been found in the true Upper Sandstones and Shales overlying the 

 grey limestone. The author gave lists of fossil Plants occurring in 

 the two sets of strata, as well as of those occurring at the separate 

 localities ; and he concluded by describing some new and some im- 

 perfectly known species of Ferns. 



6. A Monograph of the Ammonites of the Cambridge Greensand. 



By H. Seelet, Esq., F.G.S. 



[The Publication of this Paper is deferred.] 



(Abstract.) 



The excavations in the Upper Greensand of Cambridge have furnished 

 Mr. Seeley with an opportunity of examining a great number of 

 specimens of the different species of Ammonites occurring in that* 

 formation, and he now communicated the results of his examinations 

 to the Society, giving detailed descriptions of the species. 



7. On a new Crustacean from the Glasgow Coal-field. 

 By J. W. Salter, Esq., F.G.S., A.L.S. 



In a previous memoir* I endeavoured to collect together what was 

 known of the long-tailed Malacostraca of our coal-fields, — fields, it 

 may be observed, almost untrodden by the palaeontologist. My 

 friend Mr. James Russell has since found a new species, which I 

 call Palceocarabus Rnssellianus. 



It is from the Palace Craig " Black band," in the Upper Coals, 

 * Quart. Journ. Geol. Soc. vol. xvii. p. 528. 



