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 Arcturidse, which form 

 a very 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 be 

 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 tbis view. Of the families Serolidae, 

 Munnopsidse, Arcturidae, Asellidse, and Munnidse 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 Eiirycope 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 ] 000-2000 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. Leech, 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 A. 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 

 as the discoidal spot and is bounded (usually) on its inner margin by a 

 black band, which sometimes suffuses the whole tip of the wing. 

 TJie ground colour of the fore wing varies from pure white to pale 



