80 
very dissimilar in these two families, only the anterior lip exhibiting some approach 
to the structure characteristic of the Campylaspidoe. The genus Spenccbatea of 
Norman may perhaps be referable to the present family; but this genus is as 
yet very imperfectly known, only a solitary male specimen having been procured. 
The genus Diops of Paulson, I regard as identical with Sp. Bate's genus Nanna- 
stacus. In the Norwegian Fauna, only one of the two genera is represented. 
Gen. Cumella, G. O. Sars, 1864. 
Generic Characters. —Body of rather different appearance in the two sexes. 
Carapace in female somewhat compressed, and provided with a dentated crest 
along the middle, in male quite smooth throughout; pseudorostral projection more 
or less produced. Tail in both sexes very slender and mobile, with the last 
segment angularly produced behind. Integuments rather thin, and exhibiting a 
distinctly squamous structure. Eyes confluent to a single organ occupying its 
usual place at the end of the frontal lobe, and much more fully developed in male 
than in female. Superior antennae rather slender, with the inner flagellum biarticulate 
or uniarticulate. Inferior antennae in female biarticulate, with 2 plumose set® inside, 
terminal joint extremely small and tipped with a simple bristle; those in male with 
the penultimate joint of the peduncle well defined, and clothed with unusually long 
sensory filaments. Anterior lip produced in front to a conical prominence. Man¬ 
dibles rather slender, with the cutting part narrowly exserted, and provided with 
only a limited number of spines inside, molar expansion short and thick. Maxillae 
of quite normal structure. First pair of maxillipeds with the terminal joint 
lamelliform, epipodal part of branchial apparatus in female quite simple, in male 
provided with a limited number of digitiform gill-elements. Second pair of maxilli¬ 
peds with the basal joint much shorter than the remaining part, and carrying 
inside 2 unusually strong plumous setae; 3rd pair with the basal and meral joints 
produced at the outer corner, the former carrying 2, the latter 1 strong ciliated 
seta. First pair of legs with the basal joint comparatively short and thick, ter¬ 
minal part slender; 2nd pair normal; the 3 posterior pairs successively diminishing 
in length. Uropoda moderately slender, with the rami shorter than the stem, the 
inner one the larger and spinulous inside. 
Remarks. —This genus, established by the present author in the year 1864, 
is at once distinguished from Nannastacus of Sp. Bate by the eyes being confluent 
