18H().] 



MAMMALS IN THE SOCIETY S GARDENS. 



213 



the inferior maxilla. This cavity was filled with pus, but the abscess 

 was limited by fibrous walls of considerable thickness. Feeling con- 

 vinced that this was something more than a simple abscess, the 

 bony walls were dissected and the sac removed and examined in 

 detail. 



This cyst is represented of natural size in fig. 5. Projecting 

 into its posterior aspect are portions of the fangs of two undeveloped 

 teeth. This is sufficient evidence to show that we have to deal with 

 a follicular cyst — that is, the walls of this sac are constituted by 

 the greatly distended follicle of one of the teeth, probably the 

 incisor. From some cause or other suppuration had occurred, and 

 led to the necrosis of the maxilla and absorption of the fangs of the 



Fi£. 6. 



The tunica vagiualis and testis of a Lamb affected with a congenital 

 parenchymatous hydrocele. 



c, creinaster ; d, tunica albuginea ; c, epididymis ; t, secreting-tissue of 

 the testis. 



molar teeth : a remnant of one may be seen projecting into the cyst. 

 T l;e inferior dental nerve, as a mere thread, was closely embedded 

 in the walls of the jaw on the outer side of the sac. The opposite 

 m axilla was affected in a precisely similar manner. 



The last example of symmetrical disease T shall describe in this 

 communication is a singular affection of the testes of a Lamb, 

 which, so far as my knowledge of testicular disease extends, is unique. 

 The lamb was thought to be ruptured on both sides, but on cutting 

 into the supposed hernial sac a large quantity of fluid escaped, but 

 no gut or omentum were found. The remaining testis was removed 

 entire with its coverings and sent to me. The enormously dis- 

 t ended outer covering (fig. 6) is the tunica vaginalis and testis cut off 



