Copepoda taken in the West of Ireland. 131 



curvate, tapering before and behind. First segment of the 

 cephalothorax attenuated, nearly equal in length to the follow- 

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

 sparingly setose ; posterior antennas 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 Harpactidse 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 setae. 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 V W. ; and 

 at 40 miles off the Skelligs. 



This very minute species appears to differ from Setella chiefly 

 in the absence of the double falciform rostrum, described as 

 belonging to that genus by both Dana and Claus, 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. 



Genus Euterpe, Claus. 

 Euterpe gracilis, Claus. 



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

 by Mr. E. C. Davison. 



Genus Paratachidius, nov. gen. 

 Corpus lineare, rostratum. Antennae anticae breves 7-articulata3, 

 apud marem appendicem vesiculiformem gerentes, apicemque un- 

 gaiculatse ; antennae posticae parvae, ramo secundario minuto bi- 

 articulato. Mandibulae maxillaeque iis Tachidii fere similes. 

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

 cheliformes. Pedum quatuor parium priorum rami interni 2-, 

 externi 3-articulati ; paris primi ramus internus magnopere 

 elongatus. Pedes quinti paris foliacei. Sacculus ovifer unicus. 



Paratachidius gracilis, n. sp. PL VIII. figs. 8-16. 



Body slender, resembling Tackidius in general appearance. 

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



9* 



