503 Zoological Society. 



appearance ; in fact, the frequency of the remark made by persons 

 seeing these animals for the first time confirms this opinion. 



Apart, however, from this, the whole structure of this animal is 

 well worthy of consideration : the sides of the rump, and also from 

 the top of the shoulders downwards, are thick folds of skin, which 

 are much harder on those parts than elsewhere, and hang about in the 

 same position and manner as the plates on the same parts of the 

 Indian Rhinoceros. 



Having placed with the male of this animal two or three young 

 sows of the Berkshire breed, I have succeeded in obtaining a mixed 

 race. These half-bred pigs very closely resemble the male, being 

 black with white feet, and exhibit the wrinkles on the face, but in a 

 less degree. 



In what way our domestic breed of pigs has been produced 

 it is difficult to imagine. It is, however, very remarkable that in 

 the Wild Boar of Europe, Africa, and Asia the young are always 

 striped at birth, and in no instance is this marked character found 

 in any of our domestic breeds ; but the colour and markings that 

 appear at birth continue during life unaltered. Not so with the 

 wild species, whose young, although striped at first, gradually lose 

 these markings as they grow to maturity. 



The skeleton of this animal has not, at present, been examined. I 

 can say, however, that the form of the skull is strikingly different 

 from that of any of the species of Sus that I have seen. 



June 25, 1861.— Dr. J. E. Gray, V.P., in the Chair. 



Notice of the Occurrence of Sclerostoma equinum ? 

 IN THE Testicle of the Horse. By W. Baird, M.D., 

 F.L.S. 



The entozoon known by the name of Sclerostoma equinum or ar- 

 matum has long been known as infesting the Horse. According to 

 Rudolphi, Dujardin, and Diesing, it is very common at all seasons 

 of the year in the large intestines of that animal, as well as in the 

 Ass and Mule. It occurs also, though more rarely, in the duodenum 

 and pancreas ; and a smaller varity is not uncommon in the aneu- 

 rismal sacs of the mesenteriac and coeliac arteries of these animals, 

 which appear to be liable to that disease. As far as I am aware, 

 however, this parasitic worm has only been once observed (and that 

 by Gurlt) as occurring in the testicle of any of these animals. This 

 author has recorded his having found it in the tunica vaginalis of the 

 Horse. Lately a specimen of what appears to be another variety of 

 this species was received by Professor Owen from a gentleman who 

 had taken it from the substance of the testicle of a young colt which 

 had just been gelded. Only one individual was sent — a female ; and 

 though it differs somewhat from the ordinary specimens of the Scle- 

 rostoma equinum in the horse as characterized by the authors men- 

 tioned above, I am unwilling to describe it from a single individual as 

 a distinct species. The specimen is about an inch in length, and is 

 strongly marked with transverse rings, which encircle the body, but 



