1867.J Geology and Paleontology. 413 



underlying the latter, and also containing a distinct fauna. Three 

 other interesting papers we can merely mention: (1) "On the 

 relative Ages of the Boulder-clays," by Mr. George Maw ; (2) " On 

 the Secondary Cycadean Fruits of Britain," by Mr. W. Carruthers; 

 (3) " On Lower Silurian Fossils," by Mr. H. A. Nicholson. 



In the April number are six papers : Professor M'Coy records 

 the occurrence of the genus Squalodon in the Tertiary deposits of 

 Victoria, Australia, as being a further proof of the Miocene age of 

 those beds ; Mr. Carruthers describes an Aroideous Fruit (Aroides 

 Stutter di) from the Stonesfield slate ; Mr. Powrie gives a descrip- 

 tion of the genus Clieirolepis ; Mr. E. Kay Lancaster describes a 

 new genus of Cephalaspidian Fishes (JDidymaspis) from the 

 Passage beds of Ledbury ; Mr. J. Saunders gives some notes on the 

 Geology of South Bedfordshire, made during examinations of the 

 new cuttings on the Midland Kailway ; and the Kev. Mr. Gunn, in 

 a paper on the Anglo-Belgian Basin, gives a theoretical sketch of 

 the physical features of the country inhabited by the mammals whose 

 remains are found in the Forest-bed of Norfolk. 



In the May number is an important paper by the Bev. 0. 

 Fisher, " On the Ages of the < Trail ' and the < Warp,' " in which the 

 author enters into a discussion of the theories of M. Adhemar and 

 Mr. Croll, which, coming from a mathematical geologist, will be 

 appreciated by all who take an interest in the subject. He con- 

 siders that the Palaeolithic period was more ancient than the 

 formation of the " trail," and formed " some part of the interval 

 between 100,000 and 200,000 [years] before a.d. 1800." Then, 

 after the Glacial era of the " trail," followed a period of equable 

 seasons, of about 80,000 years' duration, ''which would have been 

 that of the submarine forests and their occupants." After this came 

 the period of the " warp " — " a short period of severe winter cold ;" 

 and, finally, the period of the last submergence of our valleys had 

 passed away about 8,000 years ago. The other papers in this 

 number are "On a Cycadean Stem from Potton, Beds," by Mr. 

 Carruthers ; "On the May Hill Sandstone," by Mr. Salter ; and 

 " On Valley Terraces," by Col. Greenwood. 



Amongst the correspondence we notice a continuance of the 

 discussion on Hydrothermalism between Mr. David Forbes and 

 Mr. James Geikie ; and we are glad to find that the former has 

 resolved the doubt which we expressed in our last Chronicle, by 

 stating that " Notwithstanding my distinct statement to the con- 

 trary, Mr. James Geikie seems determined to make the object of 

 my communication appear as a declaration against hythrothermal 

 action." 



