Copepoda taken in the West of Ireland. 131 



curvate, tapering before and beliind. First segment of the 

 cephalotliorax attenuated, nearly equal in length to the follow- 

 ing five segments. Anterior antennee slender, five-jointed, 

 sparingly setose ; posterior antennee comparatively large, three- 

 jointed, the first joint bearing a long secondary branch. The 

 mouth-organs are all extremely small, and similar in structure 

 to those of the Harpactidaj generally ; lower maxillipeds having 

 an ovate hand terminated by two (?) slender claws. Four 

 pairs of swimming-feet long and slender, having both branches 

 three-jointed and of nearly equal length ; fifth pair with three 

 very long and three smaller seta3. Caudal segments very 

 short, each bearing two principal seta?, one of which is short, 

 and the other as long as the body of the animal. Length -^ of 

 an inch. 



Taken in the surface-net by Mr. E. C. Davison in the open 

 sea as follows :— lat. 53° 24' N., long. 15° 24' W. ; lat. 53° 15' 

 N., long. 11° 51' W. ; lat. 51° 22' N., long. 12° 25^' W. ; and 

 at 40 miles off the Skelligs. 



This very minute species appears to diifer from Setella chiefly 

 in the absence of the double falciform rostrum, described as 

 belonging to that genus by both Dana and Glaus, and in the 

 presence of a secondary branch of the lower antenna. The 

 mouth-organs are so excessively minute and crowded together 

 that we have not been able fully to examine the mandibles, 

 nor even to find the maxillae at all. The mandibles probably 

 have a palp, though we have not seen it. 



Euterpe gracilis, Glaus. 



A few specimens taken in the surface-net in Kinsale Harbour 

 l)y Mr. E. C. Davison. 



Genus Paratachidius, no v. gen. 

 Corpus lineare, rostratum. Antennae anticae breves 7-articulatae, 

 apud marem appendicem vesiculiformem gerentes, apicemqiie un- 

 guiculatae ; antennae posticae parvae, ramo secundario minuto bi- 

 articulato. Mandibular maxillaeque lis Tachidii fere similes. 

 MaxiUipedes anteriores parvi, 3-digitati ; posteriores 4-articulati 

 cheHformes. Pedum quatuor parium priorum rami interni 2-, 

 externi 3-articulati ; paris primi ramus internus magnopere 

 elongatus. Pedes quinti paris foUacei. Sacculus ovifer unicus. 



Paratachidius gracilis J n. sp. PI. VITI. figs. 8-16. 

 Body slender, resembling Tachidius in general appearance. 

 Anterior antennse of the female seven-jointed, having a small 



9* 



