55 



were extremely rare in chalk, though common enough in ordinary 

 limestone. It seemed probable that they only occurred when chalk 

 rock had been heated, as had the chalk in this part by the great 

 thrust fault of the Isle of Purbeck. The carbonic acid gas being 

 driven out of the water (with which the chalk was saturated) by 

 this heat engendered by great earth movements, the lime was 

 deposited out of the water very slowly just as fur formed in kettles, 

 only in the form of crystals in cavities in the rock. After walking 

 round the Castle rock, and examining the nearly vertical dip of the 

 strata, some of the party inspected a large slab of Purbeck stone 

 having some reptilian bones exposed on it. A whip round being 

 held this was purchased from the owner, and is now in the 

 Society's collection. Tea was taken at the Banks Arms. 



Both meetings and excursions were very well attended in the 

 past session, the numbers greatly exceeding those present in pre- 

 vious years. 



Many valuable geological specimens have been added to the 

 Society's collection during the past year. Amongst those who have 

 presented gifts are Mr. Sherring, Mr. Carus Wilson, Mr. St. 

 Barbe, and other friends. Dr. Ord gave a fine series of Carboni- 

 ferous Corals and Mollusca from the west of Ireland, also a number 

 of leaves from the Bournemouth Cliffs. Unfortunately quite two- 

 thirds of the collection is packed in cases and cannot at present be 

 displayed or examined. Until larger premises are provided, and 

 some accommodation suitable for museum purposes obtained, this 

 unsatisfactory condition of affairs must continue. 



Chairmen : Dr. Crallan, M.A., M.B., and H. B. Wells, Esq., F.R.M.S. 

 Secretary : J. Omer Cooper, Esq. 



6th Jan., 1912. A meeting was held at Granville Chambers, at 

 which the chair was taken by Mr. Wells. 

 Organisms found and mounted during 191 1 were exhibited and 

 described by the Chairman and other members. 



The Chairman first exhibited Caprella erethizon, found at 

 Swanage. This Caprella was mentioned in the proceedings of the 

 Natural Science Society for 1908-9, as having been found at 

 Totland Bay and Swanage by Mr. Waddington. It was originally 

 met with off the coast of Normandy, and was named and described 

 by Dr. Paul Mayer, of Naples, in 1882, it being a new species. 

 Very few specimens (only 4 or 5) had been found until it was met 

 with at Totland, where it is now fairly abundant. As it has been 

 found by the Chairman and Mr. Cooper at both Totland Bay and 

 Swanage, it would seem to be establishing itself in Bournemouth 

 Bay. 



