GENERATION AND DEVELOPMENT. 



801 



seals and whales, and traces of this lobulation being visible in the human 

 foetus at birth. In the adult all the lobules are fused into a compact 

 solid organ. 



wwa, 



FIG. 462. Diagrams showing the relations of the female (the left-hand figure o) and of the male 



(the right-hand figure o ) reproductive organs to the general plan (the middle figure) of these organs 

 in the higher vertebrata (including man). C I, cloaca; R, rectum; B I, urinary bladder; 17, ureter; 

 K, kidney; Uh, urethra; G, genital gland, ovary or testis; W, Wolffian body; W d, Wolffian duct; 

 M. Miillerian duct; P s t, prostate gland; Cp, Cowper's gland; Csjo, corpus spongiosum; Cc, cor- 

 pus cavernosum. 



In the female. V, vagina; Ut, uterus; F p, Fallopian tube; G t, Gaertner's duct; Pv, parova- 

 rium; A, anus; Cc, C s p, clitoris. 



In the male.Csp, C c, penis; [/", uterus masculinus; Fs, vesicula seminah's; Fd, vas defer- 

 ens. (Huxley.) 



FIG. 463. Transverse section of a developing Malpighian capsule and tuft (human). From a 

 foetus at about the fourth month; a, flattened cells growing to form the capsule; 6, more rounded 

 cells, continuous with the above, reflected round c, and finally enveloping it; c, mass of embryonic 

 cells which will later become developed into blood-vessels. X 300. (W. Pye.) 



The supra-renal capsules originate in a mass of mesoblast just above 

 the kidneys; soon after their first appearance they are very much larger 



