CRTJSTACEA. 495 



Genus, Geaya. — Spence Bate. 

 Approaches Phoxus, but with, the eyes large and conspicuous. 

 GnAYA IMBE.ICATA. — Spence Bate. — Bate and Westtoood, vol. i, p. 

 152. 

 Taken in Falmouth Harbour. 



Genus, Westwoodilla. — Spence Bate. 

 Head (Cephalon) produced in front, eyes confluent, antennae 

 subequal. First pair of legs subchelate, second not so. 

 Westwoodilla c^oula. — Spence Bate. — Bate and Westwood, vol. 

 i., p. 155. 

 Taken in the trawl off the Eddystone. Mr. Edward has sent 

 it to me from the Moray Frith. 



Westwoodilla hyalina. — Spence Bate, Cat. Amps. Brit Mus., p. 

 103, pi. vii,fig. 5. — Bate and Westwood'' s Sessile Eyed Crust, 

 p. 158. 

 This species was procured from trawl refuse which had been 

 taken near the Eddystone Lighthouse. 



These two species may be only male and female. In general 

 form they are not very dissimilar, but there is a considerable 

 variation in the microscopical structure of the dermal tissues. 



The former species W. ccecula is undoubtedly a female, having 

 been taken with ova. The latter we have not determined. 



Genus, Acanthonotus. — Owen. 

 App. to Ross., Scd. voyage N.W. Passage, p. xc. 



Cephalon anteriorly produced slightly, antennae simple, sub- 

 equal. Hands feeble, subchelate. Telson single, cleft to the 

 apex. 



Acanthonotus owenii. — Spence Bate. — Bate and Westwood, p. 

 232. 



This species is pretty generally distributed from the Shetland 

 to the coast of Cornwall, it has been dredged at Falmouth, and 

 found in trawl refuse brought in from the Channel off the Cornish 

 coast. But all the specimens were taken from the back and gill 

 chamfers of the Corwich crab [Maia squinado). They appear to 

 live among the thick fur on the back of this spider crab, as if it 

 was their natural habitat, their prehensile legs being pecu- 

 liarly adapted for holding themselves on that animal. 



