1062 MR. R. I. POCOCK ON 
The cord was still attached to the mother, but was soon brqken 
‘after she had swum 20 yards or so. 
After the birth of the young, which was a still-born male, ihe 
mother was much easier, and before long was swimming about 
normally. After about five hours, the first signs of the after- 
birth appeared and was suecessfully passed 44 ‘hours later. As 
described to me by the superintendent who witnessed it, the after- 
birth was ‘a chamois leather-like paunch” and weighed 13 lbs, 
Unfortunately it was thrown away. There were slight straining- 
movements during the passing of the placenta, but very little 
bleeding. 
The young weighed 7 lbs. approximately and measured 2 feet 
2 inches. It was perfectly formed, and its skin was soft, 
resembling a kid glove. 
The mother died on Wednesday, 10th June—probably, if she 
had been allowed to remain in the sluice for a time, the fetus 
would have turned successfully, and both mother and young 
would have been saved. On the journey between Lewes and 
Brighton the mother passed a certain amount of foaming blood 
through her nostrils, but when placed in the tank seemed to 
be perfectly fit. 
The mother and young are at present at Brighton to be mounted 
for the local Museum. 
Pine and Beech Martens. 
(Text-figures 1-4.) 
Mr. R. I. Pocock, F.R.S8., F.L.S., F.Z.S., Curator of Mammals, 
gave an exhibition, illustrated by lantern-slides, to show some 
newly noted points of difference between the Pine Marten (J/artes 
martes) and the Beech Marten (Jartes foina) and remarked :— 
“The cranial and dental differences between these two species, 
pointed out by Mr. E. R. Alston in 1879 (P. Z. 8. 1879, p. 468), 
are well known, and have been recently restated by Miller (Cat. 
Mamm. Western Europe, 1912). Alston scarcely dealt with 
external characters, and Miller, when deseribing J/. foina, dis- 
missed them as follows: ‘‘ external form as in J/. martes, but fur 
of less fine quality ; colour usually more greyish or drab than 
in IW. martes and seldom with the rich brown tints of [that] 
species, the throat patch never strongly tinged with yellow.” 
From this it might be inferred that the only external differences 
between the two species are found in the texture and colour of 
the fur. That the differences in the structure of the ears and 
feet I am about to describe were overlooked by Miller, must 
presumably be attributed to his working with dried skins and 
not with specimens preserved in alcohol. The material upon 
