8 MEETINGS. 



Vertebrates and their development, and the different methods 

 of attachment of teeth. Thence he proceeded to speak of 

 some interesting departures from the typical methods of 

 attachment as, for example, in the pike and hake. Examples 

 of dentition amongst fishes next claimed attention, (a) The 

 elasmobranchii, e.g., sharks and rays ; ( b) The teleostii, e.g., 

 pike, salmon, &c. (c) the rostral teeth of the saw-fish, and 

 this was followed by an account of the dentition amongst 

 reptiles, with a detailed description of the poison fangs of 

 snakes, and the parts concerned in striking. The lecture 

 throughout was most interesting, and was illustrated with 

 diagrams previously prepared, and sketches on the black 

 board, together with several specimens illustrative of different 

 parts of the subject. 



Mr. C. De La Mare followed with the concluding portion 

 of his paper on " The correlation and relative age of the rocks 

 of the Channel Islands." The following resume will briefly 

 show the conclusions to which the author arrived as to the 

 probable age and order of the rocks of the islands viewed in 

 the light 01 the recent investigations : — 



(a) That the gneiss and hornblende schists, the diorite, the 

 granites of Herm and Jethou, as well as some of the Guernsey 

 granites, also a large proportion of the dark blue diorite or diabase 

 dykes, and perhaps some of the pink felsites of Guernsey and 

 Alderney are Archoean. (h) That the Jersey argillites, the Jersey 

 and Cobo granites, the remainder of the diabase dykes, the quartz 

 felsites and rhyolites, the Jersey conglomerate and the Alderney 

 grits are comprised within the limits of the Cambrian system, fcj 

 That the mica-trap dykes belong to the Carboniferous period, fdj 

 That with the exception of some superficial pleistocene deposits no 

 newer rocks are found in the Channel Isles. 



The late hour precluded much discussion on the papers. 

 Hearty votes of thanks to the contributors of them brought a 

 most interesting meeting to a close. 



Monthly Meeting held February 12th, 1890, the President of 

 the Society, Mr. T. Guille, in the chair. 



Notwithstanding the inclement weather, the attendance 

 was good. The minutes of the last meeting having been read 

 and confirmed, the Secretary announced that The Report of 

 the Smithsonian Institution (Washington), for 1885, in two 

 large volumes, had been presented to the Society by that 

 Institution. 



