CRUSTACEA. 



123 



Dynamexe rubra. — Leach, Diet. Sci. Nat., xii, p. 344. — Bate and 

 Westwood, p. 419. 

 Occurs all round our coast. 

 Dynamene montagui. — Leach, Diet. Sci. Nat., xii, p. 344. — Bate 

 and Westwood, p. 423. 

 We have taken it among fuci between tide marks in Cornwall. 

 It is tolerably common associated with, other allied forms all 

 round our coast, on rocky beaches. 



Genus, Cymodocea. — Leach. 

 Like Dynamene, but with a tooth in the centre of the emargin- 

 ation in the middle of the tail. 



Cymodocea emarginata. — Leach, Diet. Sci. Nat., xii, p. 343. — 

 Date and Westwood, p. 428. 

 Dr. Leach took his specimen at Plymouth, under Mount Batten. 

 Mr. John Cranch found specimens less strongly granulose, at 

 Falmouth. 



Genus, N/Esa. — Leach. 

 Like Cymodocea, but with the sixth segment of the body dorsally 

 produced into a strong bidentate process. 



NvEsa bidkntata. — Adams, Trans. Lin. Soc.,vol. v, p. 812,/. 3, 4 

 Date and Westwood, p. 431. 

 Common probably all round the south western coast of 

 England, including the rocky shores of Cornwall, where it has 

 been found. 



Genus, Campecopea. — Leach. 



Six segments, and with a single long dorsal tooth in the male. 



Campecopea iiirsdta. — Montagu, Trans. Lin., vii, p. 71, t. 5,f. 8. 

 Bate and Westwood, p. 434. 

 This species was found by Montagu on the coast of Devonshire. 

 We have taken it in some profusion at Torquay and Polperro, 

 amongst the small dry fuci that exist on the surface of the rocks 

 within reach of the spray of the sea, but where the sun appears 

 to drain off all moisture. 



Campecorea cranchii. — Leach, Diet. Sci. Nat., xii, p. 341.— Bate 

 and Westwood, p. 436. 

 Found with the preceding, and is probably the female. Taken 

 at Falmouth, as well as plentifully mingled with the former 

 species in the localities named. 



