CALIGOIDEA. 137] 



to the antennae with a sucker disk, behind four-lobed, the two inner 

 lobes narrow, curved and subacute. Second segment transverse, 

 laterally subacute. Wings of third segment slightly longer than 

 broad, about half as long as the abdomen, a little the broadest 

 behind, angles rounded, posterior margin hardly sinuous, oblique 

 transverse. First segment of abdomen profoundly two-lobed, second 

 quadrate. Caudal stylets large, subovate, extending a little beyond 

 the extremity of the abdomen, setae very short. 



Plate 95, fig. 4 a, dorsal view of animal, enlarged ; 6, ventral view; 

 vn, third pair of natatories ; n 9 laminae of fourth pair ; o, last abdo- 

 minal segment ; p, caudal stylets. 



From the body of a shark, taken south of Tongatabu, Pacific Ocean. 



Length, half an inch. Body greenish in part, or subtransparent. 



The front is obsoletely emarginate. The carapax is scarcely as 

 long as broad, and the inner lobes behind are curved under the outer 

 lobes. The wings of the third segment are nearly trapezoidal in form, 

 and very slightly longer than broad ; and in the specimen seen, they 

 were not quite in contact on the medial line. The second and third 

 segments belong to the third and fourth pairs of natatories. 



The abdomen (as seen below) is rather longer than the carapax. 

 The caudal lamellae have a rounded apex, and bear five minute setae, 

 two near middle of posterior margin, one a little more exteriorly, and 

 two on the outer margin, near its middle. 



The posterior antennae have a slender, recurved, pointed apex, as 

 usual in the Caligi. The first pair of legs has the basal portion nearly 

 as long as the following, and the furcation very short. The second 

 pair is large, and has an acute moveable fiuger plying against a broad 

 and low, flat-topped prominence, answering to an immoveable finger. 



The first pair of natatories have two short branches, furnished w;th 

 very short setae. The setae of the second pair are also short. 



This species is near D. affinis (Hist. Nat. des Crust., par M. Milne 

 Edwards, iii. 465, Plate 38, figs. 15-18), but the inner lobes to poste- 

 rior part of carapax are subacute ; the caudal lamellae extend beyond 

 the extremity of the abdomen ; the abdomen is considerably narrower 

 than the carapax j the form also of the second segment of the body is 

 different. 



