94 DR RICHARD J. A. BERRY. 



only, the apical portion, which is differentiated from the basal 

 portion by means of a slight constriction. When it is remem- 

 bered that the rabbit, with a caecum and a very delinite appendix 

 containing large masses of lymphoid tissue, also belongs to this 

 group, it is evident that the Rodentia furnish some most impor- 

 tant and significant information. 



Carnivora. 



Of the Carnivora, the cat forms the type, and has already been 

 described. The other carnivorous animals examined are : — 



Hycena st7'iata, the striped hyasna. 

 Canis domesticus, the dog. 



The cj€cal apex of the striped hyicna very closely resembles 

 the type. It is depicted in PI. XL 19. The apex is practically 

 a mass of lymphoid tissue, forming distinct germ centres. This 

 specimen is further remarkable for the number and large size 

 of the macrophages which it contains. They are not, of course, 

 visible in the plate, which is only a low-power view. 



The appearances presented by the caecum of the dog are 

 shown in transverse section in PI. XI. 20. The appearances 

 very closely resemble those of ordinary large intestine, that is 

 to say, Lieberkiihn's follicles cut in various directions, with a 

 small amount of lymphoid tissue between these follicles. At 

 certain places there are, however, both at the ctecal apex and 

 also at other parts of the ciecum, large and very definite areas 

 of lymphoid tissue situated in the submucosa. 



The carnivora examined closely resemble the type. — the cat 

 — and fully support the constantly recurring fact that lymphoid 

 tissue is the characteristic feature of the ca3cal apex. 



Insectivora, — EriTiaceus Europeus, the Hedgehog. 



Of the insectivorous animals, the hedgehog, a hibernating 

 animal, was the only one which could be obtained, and probably 

 proved one of the worst of its order, inasmuch as it possesses no 

 caecum. Sections were made from the junction of small and 

 large intestine. There is little or no lymphoid tissue. 



