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Show 1903.] MR. F. P1CKARD-CAMBRIDGE ON NEW SPIDERS. 151 adult animals) nothing more than a local variety produced by comparatively unfavourable conditions. In considering the probability of the existence of local races of Elk, it must be remembered that 110 northern mammal, except perhaps the reindeer, has such wandering habits ; and though a race might become temporarily isolated in an area which was entirely surrounded by a large extent of country providing no suitable food, yet there is no doubt, in my mind, that when their favourite food had become partially exhausted, they would migrate many hundreds of miles, and thus prevent the establishment of local races. A very interesting paper 011 the former existence of the Elk in the Thames Valley in England, with a plate showing the great similarity of its horns to those now existing, is published by Mr. E. T. Newton, F.R.S., in the Quarterly Journal of the Geological Society, vol. lix. (1903), and I am much indebted to that gentleman for sending it to me. February 17, 1903. Dr. H en r y W o o dw a r d , F.R.S., Vice-President, in the Chair. Mr. R. E. Holding exhibited and made remarks upon an adult skull of a Collie Dog, indicating a displacement of the incisors caused by the closing of the left lower canine upon the third incisor of upper jaw, and which apparently retarded the development of the second incisor of that side. The skull also showed a supernumerary canine which could in 110 way be mistaken for a retained milk-canine. Mr. Holding also exhibited portions of three Rabbits' skulls having " over-shot" incisor teeth. In one specimen the abnormality had caused a deviation from the median line of the anterior portion of the skull; and in another the incisors, after leaving the premaxilla, had formed a complete circle and grown into the palate, causing starvation and death of the animal. The following papers were read :- 1. On some new Species of Spiders belonging to the Families Pisauridce and Senoculidce ; with Characters of a new Genus. By F r e d e r ic k P i c k a r d -C a m b r id g e , B.A., F.Z.S. [Received January 10, 1903.] (Plates X IV . & X V .1) While working out the Spiders of the two families Pisauridce and Senoculidce of Central America for the ‘ Biologia,' opportunity was kindly offered by Mr. R. I. Pocock for an examination of the material in the British Museum Collection, with the result 1 For explanation of the Plates, see p. 168. |
