122 ON A VARIETY OF ANTHOCHARIS EUPHENO. [Feb. 2, 
and in the Arctic Ocean; it appears therefore to be correlated in 
some way which is not understood with a low temperature of the 
water. 
The majority of the deep-sea Isopoda are entirely blind, or have, 
at most, rudimentary eyes devoid of pigment ; of the deep-sea species 
obtained by the ‘ Challenger ’ only 25 p.c. have well-developed eyes, 
and all these species but three belong to the Arcturidz, which form 
avery striking exception to the general rule. In every instance 
but one the genera which are confined to the deeper waters are blind ; 
and it is just possible that the presence or absence of eyes may he 
an indication of the time which the species has inhabited the deep 
sea. 
It is commonly believed that the deep-sea species are larger than 
their shallow-water allies; the examination of the ‘ Challenger’ 
Isopoda lends some support to this view. Of the families Serolide, 
Munnopside, Areturide, Asellidee, and Munnide the deep-sea 
species are certainly the larger. 
With regard to the range in depth, the greatest depth at which 
any species has been met with is 2740 fathoms; the species 
obtained at this great depth is Hurycope intermedia. Only a few 
species descend below the 2000-fathom line, indeed only three to any 
extent. The majority of the deep-sea forms were dredged in the 
intermediate zone of 1000-2000 fathoms—twenty-three species out of 
a total of forty-four, and this does not include five species which 
were dredged just below the 1000-fathom limit, viz. in 1000-1070 
fathoms. I hope to discuss more fully the distribution of the deep-sea 
Isopoda in my forthcoming Report. 
5. On a Variety of Anthocharis eupheno, from Mogador. 
By J. H. Lescu, F.Z.S. 
[Received January 18, 1886.] 
During a recent excursion to Mogador I obtained examples of a 
new form of orange-tip Butterfly, which I propose to call 
ANTHOCHARIS EUPHENO, var. ANDROGYNE. 
The male of this variety differs from the typical A. eupheno in its 
larger size, and in the fainter markings of the underside of the hind 
wings, which are rarely strong enough to be discerned from the upper 
side. 
The female is much larger than typical specimens of 4. eupheno, 
agreeing with the male in markings and in the shape and greater 
depth of the fore wings. The orange blotch, instead of being con- 
fined to the tip of the fore wing in the usual manner, extends as far 
asthe discoidal spot and is bounded (usually) on its inner margin by a 
black band, which sometimes suffuses the whole tip of the wing. 
The ground colour of the fore wing varies from pure white to pale 
