224 THE ZOOLOGIS'r. 
Yorkshire. Dr. Day’s fourth specimen was got off the Island of Skye. 
This Argentine, nevertheless, extends from Norway to the Mediterranean, 
being found in the latter all the year round, and is stated to be a deep-sea 
fish. Besides its rarity in British seas, a further interest is attached in the 
fact that Mr. Clarke has figured and described a new species, A. decagon, 
as inhabiting New Zealand; but his unique example, in all essential 
particulars, agrees with the European species. Has the latter, therefore, 
such a wide geographical range is a problem yet to be solved ? 
March 18.—Prof. Artmay, F.R.S., President, in the chair. 
Messrs. W. Duckenfield Scott (Wimbledon) and Wardlaw Ramsay 
(Portsmouth) were elected Fellows of the Society. 
The President said that before entering on the ordinary business of 
the meeting, it became his melancholy duty to announce the death of 
Professor Thomas Bell, at the age of eighty-seven. Prof. Bell was the 
oldest Fellow of the Society, having been elected into it in 1815. He had 
held the Presidential Chair for many years, and under his judicious and 
able guidance the Society had marvellously advanced in prosperity. He 
was a distinguished zoologist, and by his researches had largely advanced 
our knowledge of the Fauna of the British Isles. His labours have left 
their mark on the Zoology of Britain, and it is hard to say who can take 
his place in the department of Natural History in which he had shown 
himself so loving and conscientious an observer. He was known per- 
sonally to many present, and by reputation to all of us, and the meeting 
will receive with sorrow the sad announcement that he has his place no 
longer among the Fellows. 
There was exhibited, for Mr. John T. Carrington, a male and female 
example of the Northern Stone Crab (Lithodes arctica), which had lived in 
the Westminster Aquarium. The peculiar symmetry of the abdominal 
segments in the female was adverted to, and for this and other reasons an 
affinity with the Hermit Crabs pointed out. 
In the absence of the author, the Secretary read a communication from 
Prof. Westwood, ‘On a supposed Polymorphic Butterfly from India.” The 
author observed that when a species is connected with problems of biclogical 
interest,—such as modifications it may undergo through variations of food, of 
temperature, and of geographical distribution, or the possibility of two or 
more species being proved to be only dimorphic or polymorphic forms of a 
single species,—the investigation assumes a sufficiently widened interest to 
warrant ample discussion. Proceeding on this basis, he discussed the 
peculiarities of two supposed species of Lepidoptera, Papilio Castor and 
P. Pollux, from Assam and Silhet. He admitted that the variation in size 
and marking of the sexes of the same species of the genus Papilio is 
puzzling. As regards P. Castor and P. Pollux, he showed that authors are 
