32 RICHARD ASSHETON AND THOMAS G. STEVENS. 
in the transference of this pigment into the maternal blood 
stream. 
5. The subcircular bodies of Owen we find as described by 
him and Turner, though we note the presence of minute villi 
on their outer surface. 
6. We confirm the opinion of previous writers that the 
zonary band in part is a “deciduous” form of placenta, 
although there is not much maternal tissue except the blood. 
It is not correct to speak of the after-birth being composed 
of a “much hypertrophied mucosa layer of the uterus.” 
7. The placenta of the elephant shows by its long villi, 
which tend to remain embedded in the uterus wall, a resem- 
blance to the condition found in the Sirenia; by the villous 
patches at the poles and other villi which come out from the 
uterus, either with or without their trophoblastic covering, 
but with no maternal cells attached, a resemblance to the 
ungulata vera of the Perissodactyl type; by the invasion of 
the trophoblast—if such it is—by the maternal blood stream, 
a resemblance to the Discoplacental type, although'the actual 
manner by which this invasion occurs would seem to be—so 
far as our very limited material affords us opportunity of 
observation—unlike anything hitherto described.! 
8. The resemblance, at first sight obvious enough to the 
zonary placenta of the carnivora, is superficial. The ele- 
phant’s placenta differs from that of the carnivora in (a) con- 
sisting of three areas of attachment instead of one, two of 
which are wholly in the non-deciduous type, the other partly 
deciduous, partly non-deciduous. (b) There is nothing 
formed comparable to an angio-plasmode. (c) The maternal 
capillaries do not directly become the maternal vessels of the 
after-birth. 
1 There is a very marked resemblance to the conditions found in the 
sheep’s placenta during the final stages of development. This I hope to 
describe in detail in a paper now in preparation.—R, A, 
