CRUSTACEA. 



Hi) 



feel sure that the variations between the several forms are de- 

 pendant upon habitat. Those of the Arctic and more northern 

 forms having the spines more strongly developed. 



Found occasionally on stony ground in about 20 fathoms of 

 water. 



Crangon trispinosus. — Three-spined shrimp. — Bell, Stalk-eyed 

 Crust., p. 265. 



Pontophilus trispinosus. — Hailstone, Mag. Nat. Hist, Yiii.p. 261, 

 fig. 25. 



I have taken four specimens of this species 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. 



Genus, Nika. — Risso. 

 First pair of antennae two branched ; first pair of legs dissimi- 

 lar, one chelate, the other simple ; second pair long multi 

 articulate, minutely chelate. 



Nika edulis. — Risso, 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. 



Genus, Autonomea. 



"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 antenna} slender, and much longer than the body, 

 first pair of hands only with fingers." 



Automomea olivii. — Milne Edwards, Hist, des Crust., t. ii,p. 361. 



" This species has been hitherto unknown as British, but I have 

 examined several specimens taken from the stomachs of fishes, 

 from the depth of 15 or 20 fathoms. ISome of these wore of 



