24 ON ENIOMOSTKACA COLLECTED IN THE SOLWAY DtSTEICl 



water species, but with the exception of Tachidius hrevicornis 

 and T. littoralis M. Canu does not mention any of the species 

 associated with Nannopus at Seaton Sluice. 



Perhaps even more interesting than the mud-inhabiting species 

 are those found in the littoral sub-brackish pools already referred 

 to. In these pools there was an abundant and varied vegeta- 

 tion, the precise constituents of which I did not take accurate 

 note of, not being aware, in fact, that I had anything in my net 

 more than the usual inhabitants of such localities. All that I 

 can now say is that among the vegetable contents of the pools 

 were green Algae — probably Enteromorpha — and many of the 

 ordinary amphibious plants and grasses. Amongst the microzoa 

 were several species of Cyclops, some of the commoner Cypri- 

 didcB, numerous Notonectce, and Collembola (Isotoma aquatilis, 

 Miiller). The most interesting Copepoda were those now de- 

 scribed, Itunella suhsalsa, nov. gen. and sp., and Canthocamptus 

 subsalsus, nov. sp. 



Family CANTHOCAMPTIN^. 

 Genus ITUNELLA,* nov. gen. 



Body Bubcylindrical, straight or only very slightly sigmoid, 

 scarcely at all tapered backwards, no constriction or distinct de- 

 marcation between thorax and abdomen : antennae and limbs 

 extremely short in proportion to the size of the animal. Anten- 

 nules seven -jointed; secondary branch of antennae small, con- 

 sisting of one joint only. Outer branches of the swimming feet 

 three- join ted : inner branch of the first foot two- jointed, of the 

 second, third, and fourth one-jointed. Posterior footjaw forming 

 a prehensile unguiculate hand. 



The mandibles and mouth-organs generally are so extremely 

 small that I have not been able to observe them satisfactorily, 

 nor have I been able to detect any eyes. 



Itunella subsalsa, n. sp. (Plate I.). 



Female. — Antennule very short, scarcely more than half as 

 long as the first cephalo-thoracic segment, seven- jointed, rather 



* liuna, the Roman name of the Solway. 



