Remarks on certain Islands in the New Hebrides. 467 



igneous rocks, and suggest that the peculiar phenomena may be due 

 either to the injection of igneous material between the layers of the 

 stratified series near the surface of the sea-bed while deposition was 

 going on, or possibly to the flow of a submarine lava. 



The forms of the radiolaria observed in the deposit, and also their 

 mode of preservation, are described in an Appendix by Dr. G. J. 

 Hinde. 



3. " Note on a Radiolarian Rock from Eannay Bay, Port Darwin, 

 Australia." By G. J. Hinde, Ph.D., V.P.G.S. 



4. " Notes on the Geology of the District west of Caermarthen." 

 Compiled from the Notes of the late T. Roberts, Esq., M.A., E.G.S. 



To the east of the district around Haverfordwest, formerly de- 

 scribed by the author and another, an anticlinal is found extending 

 towards Caermarthen. The lowest beds discovered in this anticline 

 are the Tetragraptus-heds of Arenig age, which have not hitherto 

 been detected south of the St. David's area. They have yielded 

 eight forms of graptolite, which have been determined by Prof. 

 Lapworth. The higher beds correspond with those previously 

 noticed in the district to the west ; they are, in ascending order : 

 (1) Beds with ' tuning-fork ' Didymograpti, (2) Llandeilo limestone, 

 (3) Dicranograptiis-sliales, (4) Robeston Wathen and Sholeshook 

 Limestones. 



Details of the geographical distribution of these and of their 

 lithological and palaeontological characters are given in the paper. 



February 22nd.— W. H. Hudleston, Esq., M.A., E.R.S., 



President, in the Chair. 



The following communications were read : — 



1. " On the Microscopic Structure of the Wenlock Limestone, 

 with Remarks on the Eormation generally." By Edward Wethered, 

 Esq., E.G.S., E.R.M.S. 



2. u On the Affinities (1) of Anihracoptera, (2) of Antliracomya." 

 By Dr. Wheelton Hind, B.S., F.G.S. 



3. " Geological Remarks on certain Islands in the New Hebrides." 

 By Lieut. G. C. Erederick, R.N. 



As far as can be judged from the soundings obtained, the New 

 Hebrides are probably situated on a bank lying from 350 to 400 

 fathoms below the surface of the ocean and running in a N.N.W. 

 and S.S.E. direction, with a deep valley between it and New Cale- 

 donia. The only two soundings obtained between these two groups 

 are 2375 and 2730 fathoms, the former within a short distance of 

 the New Hebrides. 



Of the islands, Tanna is volcanic — an active volcano, apparently 

 consisting entirely of fragmental material, being situate on it's 

 eastern side. Efate has some volcanic rock, but is chiefly of coral 

 formation. It rises to a height of 2203 feet, and in some parts has" 

 a terraced appearance, the terraces denoting distinct periods of 





