36 IMMUNITY IN HEALTH 



A few ungulates, e.g., Peccary (Dicotyles), Fig. 11; 

 Tapir (Tapirus Americayius), Fig. 12. 



Same marsupials, e.g., Vulpine Phalanger (Tricho- 

 sums Vulpinus), Fig. 13 ; Koala* {Phascolarctus 

 Cinereus), Fig. 14 ; Wombat (Phascolymis Wom- 

 bat), Fig. 15. ^ 



Most lemurs, e.g.. Lemur Macaco (Figs. 16 and 17). 



All the anthropoid apes, Orang (Fig. 18) ; Gibbon 

 (Fig. 19); Chimpanzee (Fig. 20); Gorilla (Fig. 

 21). Man (Fig. 22). 



A less well developed appendix also occurs in many 

 other animals, such as the Puma, the Civet, and the 

 Ichneumon. 



* It must be admitted that the presence of lymphoid tissue has 

 not been demonstrated in every instance in this Hst so far as I am 

 aware. That the apex of the caecum contains lymphoid tissue in its 

 walls in almost all mammals has however been shown by Berry. 

 Stapley, on the contrary, declares that the koala's ca?cum (in which 

 term he includes the appendix) contains no lymphoid tissue. He also 

 failed to find lymphoid tissue in two out of three wombats' appen- 

 dices which were sectioned. He does not, however, mention vhethcr 

 the wombats were old or young, and in this connection the atroph\ 

 of lymphoid tissue after puberty and its fibrosis following inflamma- 

 tion must be borne in mind It should perhaps be added that 

 Staplev's general conclusions as to the form and nature of the 

 appendix are quite opposed to those supported here. 



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