1903. | MR. F. PICKARD-CAMBRIDGE ON NEW SPIDERS. 151 
adult animals) nothing more than a local variety produced by com- 
paratively unfavourable conditions. In considering the probability 
of the existence of local races of Elk, it must be remembered 
that no 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 on 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. Henry Woopwarp, F.R.S8., Vice-President, 
in the Chair. 
Mr. R. EK. 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 develop- 
ment of the second incisor of that side. The skull also showed a 
supernumerary canine which could in no 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 abnor- 
mality 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 Pisauride and Senoculide ; with Characters of 
a new Genus. By Freperick PicKARD-CAMBRIDGE, 
B.A., F.Z:S. 
[ Received January 10, 1903. ] 
(Plates XIV. & XV.") 
While working out the Spiders of the two families Pisauride 
and Senoculide of Central America for the ‘ Biologia,’ oppor- 
tunity 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. 
