CYRTOPHIUM. 195 



retreat, and seize the marine animalcules on which they 

 feed. The Coropkium, which runs very quick, wages war 

 on these Annelids, and pursues them relentlessly. Numbers 

 of them may be seen attacking sea-worms ten or twenty 

 times their size, and even small fish and mollusca that come 

 in their way are eaten by them. Millions of them may 

 sometimes be seen beating the mud with their large antennae, 

 in pursuit of their food. In their turn, they become the 

 prey of many birds and fishes. 



Although Mr. Bate does not appear to have met with 

 any species of Say's genus Unciola, we may mention that 

 Mr. Gosse found the Unciola irrorata of the American na- 

 turalist in our seas.* 



Gen. 91. CYRTOPHIUM, Dana. 



The first to the seventh joints after the head, inflated; the 

 following joints compressed. The last false feet rudimentary. 

 Telson scale-like. 



Cyrtophium Darwinii, Spence Bate. — Dorsal surface 

 imbricated ; the fourth false foot longer than the fifth. 



* Mr. Gosse has figured this species in the first part of his excellent 

 Manual of the Marine Zoology of the British Isles, p. 141 (fig. 256, on 

 p. 139). 



