REPORT ON THE COPEPODA. 91 



one minute joint. The last joint of the abdomen is in both sexes (figs. 14, 15) very small, 

 shorter than the caudal stylets, which are about as broad as long; terminal setae 

 subequal, as long as the abdomen, and alike in both sexes. Eyes three, the upper pair 

 large and closely approximated. 



Habitat. — Pacific, 400 miles south of Hawaii, and north of the Sandwich Islands, 

 moderately abundant ; Atlantic off Buenos Ayres ; and off St. Vincent, Cape Verde. 



The type specimens of this species were taken in various parts of the Pacific, and are 

 evidently identical with those here described. Dana's figures of the female fifth foot, 

 however, do not agree with mine, nor, as usual, do our measurements coincide, the 

 length of the types being given as 1-1 2th to 1-1 6th of an inch. The colour is said 

 by Dana to be, like most of the Pontellce. bluish ; but this I have no means of con- 

 firming, spirit specimens only having come under my notice. 



3. Pontella acutifrons, Dana (PL XXXV. figs. 1-13), 



Pontellina acutifrons, Dana, Crustacea, U. S. Exp]. ExpecL, p. 1149, pi. lxxx. fig. 11, a.-h. 



(1852). 

 Pontella bairdii, Lubbock, Ann. and Mag. Nat. Hist., second series (1853), vol. xii., p. 117, pi. v. 



figs. 1-6. 

 1 Pontia edwardsii, Kro'yer, Nat. Hist. Tidskr., 2 Raakke, Bind ii. (1846-9), p. 599, pi. vi. 



figs. 8-11. 



Length, l-6th of an inch (4*2 mm.). Cephalothorax elongated, cylindrical, tapering 

 towards each extremity, posterior lateral angles produced and acutely angular, head 

 pointed in the middle, transversely sulcate, rostrum of moderate length and furcate. 

 Anterior antennae as long as the cephalothorax (fig. 3), twenty -four-jointed, third to 

 twelfth joints densely clothed with long hairs on the outer and finely setose on the inner 

 margin ; right antenna of the male (figs. 4-7) moderately swollen in the middle, two 

 denticulated plates terminating above and below in very long free extremities ; the 

 upper of those curved processes bites against a small tooth attached to the base of the 

 preceding antennal joint (fig. 6) ; inner branches of all the swimming feet two-jointed ; 

 marginal spines of the outer branches lancet-shaped and duplicated (fig. 8), terminal 

 spines as in Pontella detruncata. Fifth pair of feet in the male (fig. 10) having the 

 third joint of the right side irregularly quadrate, and produced at the base so as to form 

 an immovable claw, bearing at the apex a stout subpyriform claw ; the basal joint of the 

 left side has a peculiar twisted and laciniated appendage (penis V) ; the terminal joint 

 finely setose and bearing two small apical claws. Fifth pair of feet in the female (fig. 9) 

 simple, last joint elongated and trifid at the apex, penultimate joint bearing a rudiment- 

 ary one-jointed internal branch. The first segment of the female abdomen (fig. 12) is 

 usually very tumid, the caudal segments not much longer than broad, and often much 

 projected laterally (perhaps a distortion), that of the right side bearing two spines on 



