ON SOME NEW AND RARE COPEPODA FROM THE CLYDE 227 



having found it not unfrequent in some dredged material 

 from Ayr Bay. Delavalia cemula has both branches of the 

 first pair of swimming feet three-jointed, the second and 

 third joints of the inner branches being subequal and 

 together rather longer than the first joint ; and, though in 

 this respect the species does not agree with the generic 

 definition, it is nevertheless a typical Delavalia, and there- 

 fore we prefer to leave it in the genus to which it was first 

 assigned. 



(?) DELAVALIA, sp. 



This is another interesting aberrant species of Delavalia, 

 also from the Clyde, but we have not yet had time to 

 prepare a description of it. It is apparently a typical 

 Delavalia, except that, like Delavalia cemula, the inner 

 branches of the first pair of swimming feet are three- 

 jointed ; it differs, however, from that species in having the 

 first joint of the inner branches long and slender, nearly 

 equal to the entire length of the outer branches, while the 

 second and third joints, though distinct, are very short. In 

 this respect it resembles some of the species of Dactylopus. 



DELAVALIA (?) ROBUSTA, Brady. 



A Delavalia, which appears to be identical with D. 

 robusta, except in the form of the principal terminal seta of 

 the inner branches of the first pair of swimming feet, was 

 comparatively frequent in one or two of the Clyde dredg- 

 ings recently collected, and especially in a dredging from 

 Kilbrennan Sound. In these Clyde specimens the principal 

 terminal seta of each of the inner branches of the first feet 

 is stout at the base, but is otherwise long and slender, 

 and is, so far as we have observed, invariably curved forward 

 in a falcate manner : the concave margin of the seta is also 

 furnished with a dense fringe of delicate cilia. The form of 

 this seta appears to be the only point of difference between 

 the Clyde specimens a/id Delavalia robusta as described and 

 figured by Dr. Brady. Delavalia robusta has not previously 

 been recorded for Scotland, Dr. Brady's specimens having 

 been obtained off the coasts of Durham and Yorkshire. 



