268 MB. W. BATESON ON A CASE of [Mar. 20, 



Thomson's gazelles, and bushbucks lived healthily and well, though 

 they were confined in the Fort Square, where for weeks together 

 their feet and legs were never dry. Thomson's Gazelle bred for 

 two generations in the Fort Square, and then all the animals died 

 of rinderpest. This is a curious point, as none of these species 

 suffer from rinderpest in their wild state. 



From what I have seen of game, with the exception of elephant 

 and rhinoceros, I am of opinion that they are not naturally timid. 

 A railway train does not alarm the majority of animals, their 

 curiosity at first draws them quite close to it ; but within a few days 

 of the establishment of a railway in a district, trains may pass 

 noisily through a herd of game and few of them will even cease 

 grazing. It would seem that animals, and antelopes in particular, 

 are only afraid of what they have, in past experience, found to be 

 dangerous. In most districts they have learnt that human beings 

 represent danger, but in the country of the Masai, who do not 

 hunt, the game take little or no notice of man. When horses 

 were first brought to the country, in districts where game was 

 constantly hunted, a mounted man could approach wild animals 

 closely, but the moment he dismounted they fled. It is probable 

 that antelopes only distinguish man under certain conditions ; 

 they apparently recognize him as an animal that walks erect, with 

 a small head, and no neck or horns. In proof of this, it has been 

 noticed that a man with a large load on his head can approach 

 antelopes much nearer than a man without one ; to their view, the 

 man with the load, perhaps, seems to be a thick-necked animal whose 

 head is out of all proportion to his body, and whom they have had 

 no cause to fear. I have seen lions standing within 50 yards of a 

 train, showing neither sign of fear nor intention of retreating, until 

 the train pulled up and one or two men alighted. Seeing their 

 well-known enemies close to them, the lions turned and trotted 

 away. 



The slides now exhibited are from photographs taken by me 

 of animals in their natural surroundings. Those of the dead 

 animals, with perhaps one exception, were taken without disturbing 

 or arranging them in any way. 



The following papers were read : — 



1. On a Case of Homoeosis in a Crustacean of the Genus 

 Asellus — Antennule replaced by a Mandible. By W. 

 Bateson, M.A., F.R.S., F.Z.S. 



[Eeceived March 20, 1900.] 



The subject of this note is a male specimen of Asellus aquaticus 

 (an Isopod Crustacean) in which the left antennule is represented 

 by a mandible. 



The specimen was noticed when alive by Mr. J. J. Lister among 



