Obituary — Eugene Eudes-Deslongchamps. 95 



under water. There is no justification for making separate sub- 

 divisions ; the series consists of alternating beds of tuff of varying 

 colour and basicity, the prevailing tints being dark green, red-grey, 

 and light sea-green. In the upper beds there is an increasing 

 amount of sedimentary material, and more rounded pebbles are found. 

 Basic lava-flows occur, for the most part, in the upper beds. Detailed 

 work, laid down on the 6-inch Ordnance Map, appears to establish 

 a series of three folds — a northern anticline, a central syncline, and a 

 southern anticline — folded over to form an isocline, with reversed 

 dips to the S.E. The axis of folding is roughly parallel to the axis 

 of St. David's promontory. The total thickness is from 12<)0 to 

 1500 feet. The author had failed to find the alleged Cambrian 

 overlap. " The probabilities are that it is by step-faults between 

 Ehoson and Porth Sele, and not by overlap, that the displacement 

 of the conglomerate has there been effected." Also at Ogof Goch 

 it does not rest upon the quartz-felsite breccia and sheets (group 

 C of Dr. Hicks), but is faulted against them. A section was devoted 

 to the felsitic dykes, and it was suggested that they may be volcanic 

 dykes of Cambrian age. 



The Relation of the Pebidian to the Dimetian. — The author has 

 not been able to satisfy himself of the existence of the Arvonian as 

 a separate and distinct system. He notes the junction of Pebidian 

 and Dimetian in Porthlisky Bay and the Allen Valley at Porth 

 Clais, at neither of which places are there satisfactory evidences of 

 intrusion. At Ogof Llesugn the intrusive character of the Dimetian 

 was strongly impressed upon him. He criticized the mapping 

 of Dr. Hicks, and pointed out the difficulties which present them- 

 selves in the way of mapping the Dimetian ridge as Pre-Cambrian. 

 He pointed out that not a single pebble of Dimetian rock, such 

 as those now lying on the beach in Porthlisky Bay, is to be found 

 in the conglomerate. He concluded that the Dimetian is intrusive 

 in the southern limb of the isocline, and that there are no Archasan 

 rocks in situ. 



OBITTJAEY. 

 EUGENE EUDES-DESLONGCHAMPS. 



born 1830 ; died 1889. 



We regret to have to record the death of M. Eugene Eudes- 

 Deslongchamps, which occurred at Chateau Matthieu, Calvados, on 

 the 21st of December, 1889. M. E. Eudes-Deslongchamps, who 

 was born in 1880, early took an interest in scientific pursuits, and at 

 the age of twenty-three joined the Linnean Society of Normandy, of 

 which his father M.J. A. Eudes-Deslongchamps was one of the original 

 founders ; he became at once a regular contributor to the Society's 

 Bulletin, and though he commenced work with ornithology, this 

 group did not long monopolize his attention, his writings at this 

 period dealing with Jurassic Geology, the Cirripedia, Mollusca, 

 Brachiopoda, and an elaborate memoir on the Fossil Mammalia of 

 Caen. In 1856 he published, in conjunction with his father, a 

 French translation of the Introduction to Davidson's British Fossil 



