CRUSTACEA. 



121 



Occasionally taken all round our coast. A colony of young 

 animals was taken, attaching themselves to the spines of 

 Echinus sphccrus, off Plymouth. The young of these animals for 

 some time cling to the parent, hanging mostly about the antennas. 



ID OTEIDJE. 



Genus, Idotea. — Fabricius. 



Body long and narrow, legs subequal ; posterior portion of the 

 body united into one segment, having no tail appendages poster- 

 iorly projecting. 



Idotea tricuspidata. —Desmarest, Cons. Crust., p. 289. — Bate 

 and Westivood, p. 381 . 

 All along the coast. Among the largest specimens that we 

 have seen — one inch and a quarter long — were some taken off the 

 Dudman. 



Idotea pelagica. — Leach, Lin. Trans., xi, p. 365. — Bate and 

 Westivood, p. 384. 

 All round our coast, amongst weed. In Cornwall it has been 

 taken near the Eddystone. 



Idotea emarginata. — Fabricius, Fnt. Syst. ii, p. 508. — Bate and 

 Westivood, p 387. 

 Common among weeds all round the coasts of Europe. On the 

 coast of Cornwall it was found among trawl refuse, and in the 

 stomach of fish. 



Idotea linearis. — Pennant, Brit. ZooJ. (1777), iv, 118, /. 2. — 

 Bate and Westivood, p 388. 

 This species is not uncommon on many parts of the British 

 coast. We have dredged it near Plymouth, where it is not un- 

 common. I received it from Falmouth. It generally assumes 

 the colour of the weed on which it feeds. 



Idotea parallella. — Costa, d } Regno cV Napoli Crust, pi. xi, fig. 2. 

 — Bate and Westivood, p. 391. 

 This rather rare species has been taken at Falmouth and at 

 Polperro. It bears a close resemblance to CI cant is linearis, of 

 Dana, which was taken from the stomach of a fish in Rio Negro, 

 North Patagonia. 



Idotea acuminata — Leach, Fdin. Fncij., vii, 488, — Bate and 

 Westivood, 394. 



