organs oj generation of the Mexican Proteus. 421 
place between the external parts of the male and female, 
those of the male appear to surround and enclose those of 
the female, contrary to what happens in other animals. 
The female organs, in their developed state, are beautifully 
shown in the annexed drawings ; and from the appearance of 
the ova, they probably pass out singly. 
Now that the three different kinds of Proteus are ascer- 
tained to be perfect animals, Mr. Rusconi’s attack upon Mr. 
Hunter’s want of sagacity, published at Milan in 1821, 
in his work, entitled “ Amours des Salamandres Aquatiques," 
will revert upon himself and his friend Mons. de Lacepede, 
who too hastily concluded them to be larvae. 
EXPLANATION OF THE PLATES 
Plate XXI. 
Shows the external appearance of the organs of generation. 
Fig. 1. The male organs. 
Fig. 2. The female organs ; both of the natural size. 
Plate XXII. 
Shows the male organs in the different stages of develope- 
ment. 
Fig. 1. The male Proteus laid open to show the heart, 
lungs, and gills in situ, as well as the organs of generation. 
For an explanation of these, take the letters of reference 
annexed to Fig. 2. 
Fig- i = is of the natural size. 
Fig. 2. The organs of generation removed from the body : 
magnified two diameters. 
a a. The external orifice composed of plicae. 
