'a taken in the West of Ireland. 129 



anterior margin with hairs of moderate lengtli ; right antenna 

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

 joint : posterior antenna 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 setse and 

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

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

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

 extremities of which spring solitary short hairs. Fifth pair 

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

 witli a few short transverse rows of minute setge ; 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 



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 -g^ of 

 an inch. 



P. ohtusatus was taken, but iw no great numbers, by the 

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

 1871. 



Subfam. PONTELLINJE. 



Genus Anomalocera, Templeton. 

 Anomalocera Pater sonii^ Tempi. 

 Often in great abundance in the open sea. 



Genus PONTELLA, Dana. 

 Pontella brevicornisj 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 Clifden Bays. 



Fam. Cyclopidae. 

 Genus Cyclops, O. F. Miiller. 

 C^clojjs fequoreusj Fischer. 

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



Genus Thorellia, Boeck. 

 (?Euryte, Philippi, Wiegmann's Archiv, 1843.) 



Thorellia hnrntieay Boeck. 

 Taken sparingly in the surface-net in Westport and Ventry 

 Ann. it Mag. N. H. Scr. 4. To/, xii. 9 



