PROCEEDINGS OE GEOLOGICAL SOCIETIES. 



851 



Sandstone of Malta is a small Thecidium, nearly allied to T. Mediterranean, 

 but much smaller than that species, and, on close inspection, having 

 other and very decided specific distinctions. Mr. Macdonald gave a de- 

 tailed description and figures of this new species, and proposed for it the 

 name of Thecidium Adamsii. 



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

 descriptions of new Species of Fossil Plants." By J. Leckenby, Esq. 



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

 low the grey limestone, was first pointed out by Professor 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 con- 

 cluded by describing some new and some imperfectly known species of 

 Ferns. 



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

 By H. Seeley, Esq. 



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. 



In a previous paper the author collected together what was known of 

 the Macrurous Crustaceans of the British Coal-fields ; since then, Mr. 

 James Russell has discovered a new species, remarkable on account of the 

 antennules being larger than the antennse, and which Mr. Salter now de- 

 scribed in detail. 



8. " On the Occurrence of a Bituminous Substance near Mountgerald, 

 Scotland." By Dr. G.Anderson. 



The section exposed by some deep cuttings for the Boss-shire Bailway, 

 two miles north of Dingwall, exhibits a grey, micaceous, and almost hori- 

 zontal conglomerate, traversed by fissures containing a black bituminous 

 substance, which the author stated might have infiltrated down from a bed 

 of bituminous schist which apparently overlies the conglomerate. 



9. " On the Occurrence of Albertite at Mountgerald, Scotland." By 

 A. C. Mackenzie, Esq. 



In making a drain on a farm near Mountgerald, a fissure w~as discovered 

 which contained a bituminous substance very similar to the Albertite of 

 ISTew Brunswick ; a deposit of a similar nature was also discovered in 

 making a cutting through " The Crag," near Mountgerald. The author 

 described the stratigraphical and lithological characters of the rocks met 

 with in making this cutting, and stated that as many as thirty-six veins 

 containing this mineral were passed through. 



10. " On the Occurrence of Bocks of Upper Cretaceous Age in Eastern 

 Bengal." By Dr. T. Oldham. 



During the years 1851-52, the author examined the rocks of the Khasi 

 Hills, in Eastern Bengal, and made a collection of the fossils occurring 

 there. These fossils were mostly from a J^ummulitic Limestone, and were 

 evidently of Eocene date ; but some were obtained from a sandstone 

 underlying this limestone, and appeared to be of Cretaceous rather than 



