212 On old and new Amphipoda. 
males of two species and females of two species. As is well 
known, in this section of the Amphipoda the females differ 
rather strikingly from the adult males of their respective 
species. Nevertheless there can be little doubt that the sexes 
have been assorted rightly, as there are numerous points of 
resemblance between the specimens which have been classed 
as male and female of the same species, and between the two 
species there is a considerable difference of size to be taken 
into account with other important distinctions. 
Helaide. 
This family at present contains only the remarkable genus 
Neohela, $. 1. Smith, which Sars refers provisionally to the 
Corophiide, and which Della Valle places in the Icilide. 
The latter author rightly remarks that the Neohela serrata of 
the ‘ Challenger’ Amphipoda cannot properly stand in that 
genus, and suggests that 1t comes near to Mera rubromaculata 
in the Gammaride. As soon, however, as the account of the 
species of Melphidippa, Boeck, appeared last year in the 
admirable and masterly work on the Crustacea of Norway by 
G. O. Sars, there could be no hesitation in assigning the 
‘Challenger’ species to that genus; and, though the two frag- 
mentary specimens of what now provisionally becomes Melphi- 
dippa serrata came from Kerguelen Island, far in the south, 
it is not altogether impossible that the new name may be a 
synonym of Melphidippa borealis, Boeck. 
Dulichiidez. 
In this family Sars makes the Cyrtophium Darwinii of 
Spence Bate a synonym of Leatmatophilus tuberculatus, 
Bruzelius. This, however, is an oversight, since in Letma- 
tophilus there are only two pairs of uropods, whereas Cyrto- 
phium, or Platophium as it is more properly called, has three 
ae Platophium Darwinii (Bate) is identified by Della 
alle with Platophium brasiliense, Dana. In any case, 
the species named by Spence Bate is common on the south 
coast of England, and the character of its pleon agrees 
with the figures and description given of it by Bate and 
Westwood (‘ Sessile-eyed Crustacea,’ vol. i. p. 481), although 
{rom the erratic lettering of their figures confusion may easily 
arise. 
