BY T. THOMSON FLYNN, B.SC. 155 



incnt of middle portion of the adult clitoris (Fig. 7) is 

 directly derivable from that in the iDouch young by the 

 conversion of the upper portion of the median septum, and 

 the lateral septa into grooves. The growth of the middle 

 fold so formed, the completion of the lateral septa, and the 

 appearance of secondary lateral septa, lead to the arrange- 

 ment at the apex of the adult organ, while the further de- 

 velopment of the median septum, and after it a groove, in 

 the -middle portion, with the dwindling away of the lateral 

 portions, presents us with the arrangement shown in the 

 cranial portion of the adult clitoris (Figs. 5 and 6). 



BIBLIOGRAPHY. 



l.^A. Brass. Beitrage zur Kenntniss des weiblichen 

 Urogenital system der Marsupialen. Leipzig, 

 1880. 



2. — Van den Broek, A.J.P, On the Relation of the 

 Genital Ducts to the Genital Gland in Mar- 

 supial.?. Konink. Akad. von Wetersh. ts 

 Amsterd., 1906. 



3. — Van den Broek, A.J.P. Untersuchungen liber die 

 weiblichen Geschlechtsorgane der Beutel- 

 tiere. Petrus Camper, Bd. III., 1907, p. 221. 



4. — Owen, R. Comp. Anat. and Phvs. of Vertebrates. 

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5.— Hill, J. P. Contrib. to the Morph. and Devel. of 

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 N.S.W., 1899. 



6.— Hill, J. P. Do., Nos. II.-V. PL.S., N.S.W., 1900. 



7. — Hill, J. P. Contributions to the Embryology of the 

 Marsupialia. Q.J.M.S. Vol. 40, 1897. 



8. — Stirling, E. C. On Some Points in the Anatomy of 

 the Female Organs of Generation of the Kan- 

 garoo. P.Z.S. London, 1899. 



9. — Wiedersheim and Parker. Comp. Anat. of Verte- 

 brates. London, 1907. 



