Copepoda taken in the West of Ireland. 129 



anterior margin with hairs of moderate length ; right antenna 

 of the male swollen in the middle, but having no true hinge- 

 joint : posterior antennae four-jointed, with a large biarticulate 

 secondary branch springing from the basal joint. Mandible- 

 palp large, having a uniarticulate secondary branch. First 

 four pairs of swimming-feet stoutly built, with short setae and 

 broad marginal lancet-shaped spines ; branches subequal, tri- 

 articulate ; the setae of the inner margins are peculiar, con- 

 sisting of short, slender, abruptly truncated rods, from the 

 extremities of which spring solitary short hairs. Fifth pair 

 in the female having the inner branch very short, and beset 

 with a few short transverse rows of minute setae ; those of the 

 male largely developed, each formed apparently of two modified 

 three-jointed branches, the outer branch on each side forming 

 a strong terminal spine, and on the left (?) having also a very 

 large falciform claw ; the remaining processes form a number 

 of irregularly laciniated plates. Abdominal segments short ; 

 caudal segments scarcely twice as long as broad ; the longest 

 tail-seta about equal in length to the abdomen. Length -^ of 

 an inch. , 



P. obtusatus was taken, but in no great numbers, by the 

 surface-net in Roundstone Bay, on a moonlight night in July 

 1871. 



Subfam. Pontellinjs. 



Genus Anomalocera, Templeton. 

 Anomalocera Pater sonii, Tempi. 

 Often in great abundance in the open sea. 



Genus Pontella, Dana. 



Pontella brevicomis, Lubbock. 



Taken sparingly in the surface-net in Westport Bay and 

 Kinsale Harbour ; also amongst Zostera and other weeds near 

 low-water mark in Westport and Olifden Bays. 



Fam. Cyclopidae. 

 Genus Cyclops, O. F. Muller. 

 Cyclops cequoreus, Fischer. 

 In a pool near high-water mark, south of Clifden. 



Genus Thorellia, Boeck. 

 (?Eu.ryte, Philippi, "Wiegmann's Arctiv, 1843.) 



Thorellia brunnea, Boeck. 

 Taken sparingly in the surface-net in Westport and Ventry 

 Ann. <£• Mag. N. H. Ser. 4. Vol. xii. 9 



