318 
GAMMARIDtE. 
ters of N. aquilex , however, given by Schiodte, which 
we have verified and introduced into our specific cha- 
racter, in addition to the remarkably beautiful series of 
details of N, stygius published by Schiodte, leave hut 
little doubt in our minds of the correctness of his views 
in considering the Maidenhead specimens as belonging to 
a distinct species. 
In addition to the Maidenhead locality mentioned 
above, we have received a specimen captured at Wands- 
worth, Surrey, from Mr. W. W. Saunders ; also from 
Mannamead, near Plymouth (where the long and short 
tailed specimens are associated), and have taken it in 
pump water at Leyden, where also Dr. Herklots has 
taken two specimens (preserved in the Leyden Mu- 
seum) ; Caspary found it abundantly at Elberfeld ; 
Hosius at Bonn ; the Baron De la Yallette St. George 
in a well at Cologne in considerable numbers in Novem- 
ber and December; Correnzio at Munich; and Koch 
obtained it from the draw-wells about Zweibrucken. 
Koch’s figure of the animal is coloured of a pale 
greenish grey ; hut Mr. White says, in his History of 
British Crustacea, that it is snow-white. 
