208 General Notes. [Fe 
in which the eye-stalk is but slightly produced, appearing 
form. Sometimes, i in others, we find a slight notch in tł 
in place of the deep one found in the short-eyed form, dep 
thus somewhat from the long-eyed form and approach” 
to the short-eyed. 
_Of these various features, the eyes form the most impor 
beginning with the long-eyed to the short, The extraordi 
Jength of the eye-stalk beyond the eye proper, is to be accou 
for either *as representing an embryonic form or as the fu 
differentiation of the normal eye. Viewed in the former ligh 
may be supposed to have originated as an appendage upon) 
basipodite the ocular differentiation has taken place. Int 
spect it accords with Professor Huxley’s view, in so far that 
eye is considered as an appendage, while it differs from the 
of Claus and F. Miller, who deny the appendicular cha 
it. Whatever the views may be, we are quite certain that h 
these forms we see the specific differentiation going on before 
eyes. We do not ete a the specimens before us W 
all these various for ome from a single parent, or W 
Ws had a parent like itself —C. Ishikawa, University of 
apan. 
HETEROGENESIS IN THE COPEPOD CRUSTACEA.—Ina font 
Cyclopoiclea, with the view to discover if similar condi 
The standard books upon the non-parasitic forms of t 
_ poda by Claus! and Brady? enumerate many species, b 
agree entirely in synonymy, nor does it seem probable 
who alone has done most of the anatomical and emb y 
work in this section, has followed the egret of any’ 
a si proportion of the species name 
It _ he been nee aati that the marine forms of Copep ep 
occur in the Mediterranean on North seas, over all 
the British Isles. Certain ra, as Calanus and 
seem to extend through all Te of latitude from the 
the most northern seas. 3 
A confirmation of these facts may be sought in the} 
1C. Claus : _ Frei Lebenden Copepoden 86 
opepoden. Leipsig, 1803. 
1G, S. Brady: € eg pi of British islands, Roy. Soc, 1878-9. 
* Claus ; pei cit., pp. 83-86, 
