THE ANATOMY OF POLYPTERUS. 335 
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XII]. 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. 824) 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 coelom. 
_ 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 papille, the septum of the urinogenital 
sinus, the narrowness of the anal fin in the female, and the corresponding 
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