392 J. C. Dalton, Jr., on the Proteus anguinus. 
following are the longitudinal measurements of the brain of a 
Triton cristatus, 61 inches long, and that of a Proteus anguinus 
: 
1 . ‘ 
87 inches long: 
Triton. Proteus. 
Hemispherical lobes, 5 millimetres. 43 millimetres. 
Tubercula Quadrigemina, 23 a 24 eee 
Cerebellum, . . 1 ff 14 it 
The two brains could hardly be distinguished from each other, 
except for the fact that the olfactory nerve in the Proteus runs 
forward for some distance as a trunk along the inner side of the 
membranous olfactory canal, while in the Triton it breaks up 
into branches immediately on leaving the anterior extremity of 
the brain (fig. 5). : a 
It will be seen that the suppression of the visual organs in 
these animals is not, by any means, complete. There are, how- 
ever, other creatures existing in the same localities with the Pro- 
teus, in which the eyes are altogether absent. ‘T'wo species of 
Crustaceans are found in the caves of Carniola, viz: Palemon 
There is much resemblance, in regard to the condition of the 
eyes, between the Proteus and Lepidosiren Paradoxa. In the 
two specimens of Lepidosiren, dissected by Prof. Bischoff, and 
described by him in a monograph on the subject, the eyes a 
“hardly a line in diameter,” though one of the animals measure 
over three feet in length. The opening of the eyelids 1s wanit- 
ing, also, in Lepidosiren as in Proteus, and the eyeball vce vase 
pletely covered by the integument. So little is known, hones 
of the mode of life of Lepidosiren, that it is impossible to deter 
mine whether the cause of the imperfection be the same 1 b 
animals. 
that 
a gland which exists elsewhere only in the oviparous species 
the Proteus, 
the naked Amphibia; so that the Proteus is probably also © 
rous. But nothing more definite has been discovered. One 
man observer (yon Schreibers) endeavored to ascertain this Peles 
by examining specimens of Proteus, taken from their cave td 
vipa- 
Ger- 
