THE ANATOMY OP POLYPTERUS. 335 



Hyrtl : " Ueber den Zusammenhang der Geschlechts- und Harnwerkzeuge bei den Ganoiden." 

 Denksch. der k. Akad. der Wiss., Bd. viii., Math.-naturw. Classe, Wien, 1854. 

 " Ueber die Blutgefiisse der ausseren Kiemendeckel-Kieme von Pohjpterus lapradei, 

 Steind." Sitzungsb. d. k. Akad. d. Wiss. Wien, Math.-naturw. CI., lx. Bd. i. Abth. 1869. 



Jungersen : " Beitriige zur Kenntniss der Geschlechts-Organe der Knochenfische." Arbeit, zool.- 

 zoot. Inst. Wiirzburg, Bd. ix., 1890. 



Kerr, J. Graham : " The External Features in the Development of Lepidosiren paradoxa, Fitz." 

 Phil. Trans. Roy. Soc. vol. 192 B, 1900. 



Lebedinskv : " Ueber die Embryonalniere von Calamoiclithys calabaricus." Arch. mikr. Anat. 

 Bd. xliv. p. 216. 



Leydig : " Histologisehe Benierkungen iiber den Polypterus bichir." Zeitschr. wiss. Zool. 1854. 



Muller, Johannes : ' Ueber den Bau und die Grenzen der Ganoiden.' Berlin, 1846. 



Pollard, H. B. : " On the Anatomy and Phylogenetic Position of Polypterus." Zool. Jahrb. 

 Anat. u. Ont. Bd. v., 1892. 



Semon, R. : " Zusammenhang der Ham- und Geschlechtsorgane bei den Ganoiden." Morpb. 

 .Tahrb. Bd. xvii. 



Steindachner: "Polypterus aus dem Senegal." Sitzb. d. k. Akad. d. Wiss. Wien, Math.- 

 naturw. Classe, Bd. lx., 1869. 



Traqitair : " Cranial Osteology of Polypterus." Journ. Anat. & Phys. vol. v., 1871. 



Traquair : " On the Anatomy of Calamoichthys." Proc. Roy. Soc. Edinburgh, vol. v., 1866. 



Weber, Max: "Die abdominal Poren der Salmoniden, nebst Bemerkungen iiber die Geschlechts- 

 organe der Fische." Morph. Jahrb. Bd. xii. 



XIII. EXPLANATION OF THE PLATES. 



PLATE L. 



Fig. 1. General side view of the posterior part of the viscera in a female Polypterus 

 lapradei (p. 325), showing the course of the oviducts and the anal fin of a 

 female in the breeding-season. 



Fig. 2. General side view of the posterior part of the viscera in a male Polypterus 

 lapradei (p. 324) in which the ureters have been injected blue, showing the 

 testis-ridge and duct running along the ventral external wall of the ureter. 

 The anal fin of a male in the breeding-season is also shown with the 

 anal-fin muscle projecting into the posterior part of the ccelom. 



Fig. 3. A median ventral view of the testis, the kidney, and their ducts of the same 

 male specimen dissected out (p. 324). The ureter, as in fig. 2, is injected 

 blue. Figs. 2 & 3 together give a complete view of the urinogenital organs 

 in the male. 



Fig. 4. Ventral view of the urinogenital sinus in the female (pp. 325, 330), showing 

 the openings of the oviducts upon papillae, the septum of the urinogenital 

 sinus, the narrowness of the anal fin in the female, and the corresponding 



