SEVEN STAGES OF LARVAL LIFE 265 
neglecta (Kroyer), and that Thysanoessa tenera, Sars, 
should be named T'hysanoessa longicaudata (Kroyer). 
The latter species was supposed by Sars to belong to his 
genus Boreophausia, on the faith apparently of Kréyer’s 
figires drawn from a defective specimen. Both neglecta 
and longicaudata are known from British localities. 
Nematoscélis, Sars, 1883, agrees in many respects with 
Thysanoessa, but has the second maxillipeds, or first legs, 
as Sars calls them, far more remarkably elongated and 
almost filiform. In the type species, Nematoscelis meqalops, 
Sars, they are described as having little or no armature, 
except a bunch of peculiar spiniform sete at the apex. 
But Norman points out that in British specimens the 
fourth joint has several hooked spines, which look as if 
they might hold the sixth joint when bent back upon the 
fourth. Should this form hereafter prove distinct, he pro- 
poses for it the name borealis already published, but with- 
out description, in 1372. The genus is distinguished by the 
enormous development ofthe eyes, ‘ of larger size, perhaps, 
than in any other known form of Podophthalmia,’ the re- 
mark applying to the actual eyes, and not to the stalks 
which are quite short. 
Stylocheiron, Sars, 1883, has the third maxillipeds, or 
second legs, greatly produced, the two terminal joints 
being armed with spiniform bristles and spines, and the 
two forming together a kind of grasping organ. The last 
pair of legs are quite rudimentary, and the two preceding 
pairs are incomplete. In this genus the mandibles have 
no ‘palp,’ the first maxille no exopod, and the first 
maxillipeds no epipod. ‘The ovisac is single. One of the 
species, Stylocheiron longicorne, Sars, has been taken both 
in the Mediterranean and south of the Cape of Good 
Hope. Chun notes that in his mastigophdrum the lumi- 
nous organs are bright red. 
Messrs. G. Brook and W. E. Hoyle follow up the 
labours of Claus, Metschnikoff, and Sars, by tracing the 
Euphausid larva through seven stages—(1) the Nauplius, 
with body oval, unsegmented, median unpaired eye, first 
antennz (long) simple, second antenns (long) and man- 
