Bennet M. Allen — 91 
system we have some melancholy examples of the futility of making 
rash hypotheses unsupported by a sufficient array of facts. Still it is 
of interest to consider the possible interpretation that may be placed 
upon these structures when they are viewed from the standpoint of 
phylogeny. 
I am inclined to consider the funnel-cords as modified sex-cords. The 
fact that their distal extremities contribute to the formation of the 
adrenal bodies does not conflict with this interpretation, because that is 
also true of undoubted sex-cords. The funnel-cords arise just laterad of 
the true sex-cords and in a very similar manner. The fact that they 
arise from the peritoneal funnel would not be contrary to this view if the 
R 2 
eee 
lee : UMM HH 
fe AIP 
WD M 
Text Fic. F. Diagram to show essential structures of the mammalian 
sex-gland. 
M.—Mesonephros. S. O.—Sex-cord. 
MP.—Malpighian corpuscles. V.—Vestigial portion of genital 
R.—Rete-region. ridge. 
R. C.—Rete-cord. W. D.— Wolffian duct. 
S.—Sex-gland region. 
funnels could be shown to be mere recesses of the peritoneum, and similar 
to the latter in histological character. A more careful study of the 
origin of the sex-glands in the Amphibia is much to be desired as it might 
throw new light upon this question. It will be of interest to compare 
the results of this paper with those of a previous paper upon the same 
structures in the pig and rabbit. Allen, 04. 
The very schematic diagram of the testis of the pig (Text Figure Ff), 
shows the following points seen in a sagittal section passing through the 
genital ridge and the mesonephros. The genital ridge may be divided 
into three regions: (1) rete, (2) sex-gland, (3) rudimentary sex-gland 
ridge. The rete-cords are homodynamous with the sex-cords, being formed 
at the same time and in the same manner as the latter, and occupying 
