CET7STACEA. 
89 
feel sure tliat tlie variations between the several forms are de- 
pendant upon habitat. Those of the Arctic and more northern 
forms having the spines more strongly developed. 
Pound occasionally on stony ground in about 20 fathoms of 
Water. 
Ceangon teispinostjs. — Three-spined shrimp. Bell, Stalk-eyed 
Crust., p. 2&b. 
PontophiLus trispinosus. — Hailstone, Mag. Nat. Hist, viii.ji. 261, 
%. 26. 
I have taken four specimens of this spiecies in Bigbury bay, 
on the north coast of Devon. Strictly this is not Cornish, but 
I can hardly imagine that an animal can be found as near, and 
yet not existing on the coast of Cornwall, the conditions being 
so similar. 
Gestus, Nika. — R ^ sso . 
Pirst pair of antennm two branched ; first pair of legs dissimi- 
lar, one chelate, the other simple; second pair long multi 
articulate, minutely chelate. 
Nika edulis.— Crust, de Nice, p. 85; Bell, Stalk-Eyed 
Crust., p. 275 ; Edwards, Hist. des. Crust., t. ii,p. 364. 
We have taken it occasionally on stony ground in about 30 
fathoms of water. 
Nika Couchii. — Bell, Stalk-Eyed Crust., p. 278. 
We have taken this in the same locality as the other. 
With all due deference to the ability and a cute observation 
of the author of the work cited, I must insist that this is nothing 
more than a variety of N. Edulis. It was first found by Mr. 
Couch and sent to Professor Bell, who never saw but this one 
specimen. 
Gbxxjs, AuTOXOM-EA. 
“Eyes on short footstalks, projecting from beneath the border 
of the carapace. The snout scarcely passing beyond the eyes. 
The inner antennae double, one filament much longer than the 
other. Outer antennce slender, and much longer than the body, 
first pair of hands only with fingers.” 
A^utomoiiea olitii. — Milne Edwards, Hist, des Crust., t. ii,p. 361. 
“ This species has been hitherto unknown as British, but I have 
oxainincd several specimens taken from the stomachs of fishes, 
from the depth of 15 or 20 fathoms. Some of these were of 
