LIST OF LITERATURE 44S 



A central hypogastric ganglion lying dorsal to the neck of the bladder is connected with 

 the lumbo-genital nerve by a plexus in the inguinal region. 



An account of the structure of the kidney has been given. The main features are: 

 i. The kidney is a composite organ, oval in shape and triangular in cross-section, 

 made up of a great number of small unipyramidal kidneys (renculi) grouped together in 

 lobules of four to six renculi. The lobules are again grouped together in larger aggrega- 

 tions or lobes. As the renculi increase in size the lobules tend to become obliterated as 

 architectural units of the kidney. Finally the lobes tend to become obliterated also. 



2. The renculi drain into a main urinary duct running through the centre of the 

 kidney by tertiary, secondary and primary branches. 



3. The arterial supply to the renculi is afforded by renal arteries, which branch 

 within the kidney and run to the renculi. The veins from the renculi drain either into 

 a system of main veins within the kidney, or into a superficial network which ramifies 

 within the fibrous investments. The two systems — the deep and the superficial — join 

 outside the kidney to form the renal veins. 



4. There are two fibrous investments to the kidney: an outer serosa, and an inner 

 capsula fibrosa which extends into the organ among the lobules. Each renculus is 

 covered by its own tunica albuginea. 



5. A slit running down the mesal face of the kidney represents the hilus. 



A short comparative summary has been given and it has been demonstrated that 

 while the genital system of the Cetacea shows many primitive features, which suggest 

 affinity to some near-insectivore group, there are, nevertheless, reasons for comparing 

 the genital system of the Cetacea with that of the Ungulates (especially the Perisso- 

 dactyles). 



LIST OF LITERATURE 



Anderson, ] ., 1878. Anatomical and Zoological Researches: comprising an account of the zoological results of the 



two Expeditions to the Western Yunnan in 1868 and 1875. 2 vols. Quaritch, London. 

 Anthony, R., 1922. Recherches anatomiques sur Vappareil genito-urinaire male du Mesoplodon et des Ce'taces en 



general. Mem. Inst. Esp. Oceanogr. Madrid, 3 mem., 2, pp. 35-116, 5 pis., 64 text-figs. 



1926. Les Affinites des Ce'taces. Ann. Inst. Oceanographique (2), vol. Ill, pp. 93-134, pi. i, 25 text-figs. 



Beauregard and Boulart, 1882. Recherches sur V appareil genito-urinaire des Balaenides. Journ. de l'Anat. 



et de la Physiol., Annee xvm, pp. 158 et seq. Paris. 

 Benham, W. B., 1901. The Anatomy of Kogia breviceps. Proc. Zool. Soc. London, vol. 1, pp. 278-98, 4 pis. 

 Bouvier, E. L., 1889. Les Ce'taces Souffleurs. These du i er Mai, 1889. ficole Superieure de Pharmacie de 



Paris, Sect. Hist. Nat. et Pharmacie. Lille. 

 1892. Observations sur /'Hyperoodon rostratus. Annales des Sciences Naturelles Zoologiques, serie 7, 



tome xin, nos. 4-5, pp. 259-320, 2 pis. 

 Daudt, W., 1898. Beitrdge sur Kenntnis des Urogenitalapparates der Cetaceen. Jen. Zeitschr. Naturwiss., 



Bd. xxxii, pp. 232-310. 

 Delage, Yves, 1885. Histoire du Balaenoptera musculus echoue sur la Plage de Langrune. Arch, de Zool. Exp. 



et Gen. (2 me Serie), tome in bis, pp. 1-152. 

 Eschricht, D. F., 1849. Zoologisch-anatomisch-physiologische Untersuchungen iiber die Nordischen Wallthiere. 



Leipzig. 

 Gregory, W. K., 1910. The Orders of Mammals. Bull. American Mus. Nat. Hist., vol. xxvn, pp. 419 et seq. 



