Copepoda taken in the West of Ireland. 137 



Genus Nitokra, Boeck. 



Nitokra tenuicornis (Claus). 

 Dactylopus tettuicornis, Claus, Die frei-lebend. Oopepod. 



On Laminaria saccharina in Clifden Bay ; taken also in 

 the surface-net in Westport Bay, and more abundantly in 

 Koundstone Bay. 



Genus Mesochra, Boeck. 

 Mesochra Lilljeborgii, Boeck. 



One specimen, apparently referable to this species, and 

 agreeing closely, so far as our observation extended, with 

 drawings kindly sent to us by M. Boeck, was taken in the 

 surface-net in Westport Bay. M. Boeck doubtfully identifies 

 the present species with that figured by Lilljeborg as Cantho- 

 camptus Stromii. This reference may possibly be correct, 

 seeing that that author shows the inner branch of the second 

 pair of feet as consisting only of two joints ; but the descriptions 

 of Baird and Claus refer to a species in which both branches 

 of the second, third, and fourth, pairs of feet are said to be 

 three-jointed — not, therefore, to any species of the genus 

 Mesochra. 



Genus Asellopsis, nov. gen. 



Corpus depressum, segmentis caudalibus laminatis, rotundatis. 

 Pedum primi paris rami ambo biarticulati, interni elongati, valde 

 uncinati, externi perbreves ; quinti paris rami ambo subaequales : 

 ceterum Laophonti omnino similis. 



Asellopsis hispidus, n. sp. PI. IX. figs. 6-10. 



Body elongated, much depressed, lower thoracic segments 

 distinctly narrowed, the margins of the first three abdominal 

 segments produced downwards at the sides in an imbricated 

 manner. Anterior antennas short, densely setose, seven-jointed, 

 first two joints not much longer than broad, third about the 

 same length but much narrower, fourth very short and broad, 

 fifth about twice as long as the fourth, sixth and seventh equal 

 and very small, the proportionate lengths of the joints, beginning 

 at the base, being as follows — 9, 9, 9, 3, 5, 2, 2 : posterior 

 antennas nearly as large as the anterior, biarticulate, bearing a 

 very small one-jointed secondary branch. Mouth-apparatus 

 as in Laophonte ; second pair of maxillipeds three-jointed, with 

 an oval hand and long slender claw. First pair of feet having 

 the inner branch very long, biarticulate, the first joint much 

 elongated, terminal claw thick and strong ; outer branch also 

 biarticulate, the entire length being less than half that of the 



