150 DR. CHARLES CHILTON ON THE SUBTERRANEAN 
Wrzegniowski. The slight differences of the two gnathopoda in 
the form of the carpus have hitherto received little attention. 
I do not propose to enter into any points of internal anatomy, 
but, as the question of the degree of the degeneration of the 
eyes is of special interest, I may call attention to a recent 
paper by Vejdovsky, in which he criticises the accounts pre- 
viously given, and, after a careful examination by means of serial 
sections, comes to the conclusion that m none of the species 
specially dealt with is there any organ present corresponding to 
a normal Arthropodan eye; and that only in WV. puteanus, Koch, 
is it possible to speak of a true eye-rudiment, and that even here 
the degeneration has gone so far that the cells of the “ Augen- 
anlage’? have been modified into a tendon-like bundle that serves 
to attach the large brain-ganglia to the walls of the head 
34. p. 10}. 
The chief points by which the present species differs from 
other species of the genus appear to be :— 
The body is slender. 
The four anterior side-plates are not so deep as their segments. 
The upper antenne are not more than half the body-length. 
The gnathopoda have the basos broad, the carpus not longer 
than the propodos, the propodos rather broader than long, the 
dactylos with only one seta on its convex margin and only 
three or four very small ones on the concave margin. 
The first three segments of the pleon have the postero-inferior 
angle broadly rounded. 
The outer branch of the third uropod has the two joints 
of nearly the same length in the male, and in fully-grown 
specimens the last joint bears only few very short sete. (In 
younger males the terminal joint, though of about the same 
length as the first, may be more abundantly supplied with 
sete, and these may be longer than is shown in Plate 16. 
ur. 3.) 
Niepareus Kocuranus, Spence Bate. (Plates 16 and 17. 
figs. 2 & 3.) 
1859. Niphargus Kochianus, Spence Bate, Proc. Dublin Univ. Zool. & 
Bot. Assoc. i. p. 239, figs. 1 and 1a; Nat. Hist. Rev. vol. vi. 
p. 165, fig. 1. 
1859. Niphargus Kochianus, Hogan, Nat. Hist. Rev. vol. vi. pp. 166-169, 
1861. Niphargus Kochianus, Hogan, Rep. Brit. Assoc. (1860) pp. 116-117. 
