124 THE VOYAGE OF H.M.S. CHALLENGER. 



than twice as long as broad ; two short setae on the outer margin, and two at the external 

 apical angle; internal apical angle produced into a distinct tooth. Lateral eyes closely 

 approximated, and Bituated quite on the front of the head; pigment bodies dark blue. 

 In some specimens, as shown in fig. 2, the integument contains numerous bead-like rows 

 of rounded vesicular or glandular bodies, and these are symmetrically disposed on each 

 side of the body. 



Habitat. — Taken in the towing-net in many places: — Off Kandavu, Fiji; between 

 Api and Cape York ; south of Papua ; between the Arrou Islands and Banda ; at several 

 Stations amongst the Philippine Islands; in lat. 30° 32' S., long. 132° 52' W. (Station 

 287); in lat. 32° 24' S., long, 13° 5' W. (Station 335); off St. Vincent, Cape Verde 

 Islands; in lat. 25° N., long. 33° W. 



Though not unfrequent in the Challenger gatherings, the specimens which came under 

 my notice were, almost without exception, females, and I am therefore doubtful as to the 

 accuracy of some parts of the foregoing description of the male. Having had the oppor- 

 tunity, since the plate was lithographed, of examining further specimens, I am disposed to 

 think that fig. 1 has been drawn from a young individual. Adults are longer, the 

 proportion of length to breadth being as two and a half to one. The margins of the 

 abdominal segments are sometimes very minutely serrated, and the front of the head is 

 always rounded. The lateral angles of the abdominal segments in the male are some- 

 times minutely mucronate. 



2. Saphirina incequalis, Dana (PL XL VIII. figs. 1-5). 



Saphirina incequalis, Dana, Crust. U. S. Expl. Exped. (1852), p. 1211, pi. lxxxvii. tig. 7. 



,, tl<<jiui.< (9), Lubbock, On some Oceanic Entomostraca collected by Capt. Toynbee, 



Trans. Linn. Soc, vol. xxiii. p. 12, pi. xxix. figs. 18, 19. 

 ,, nitens ( <J ), Lubbock, loe. fit. 



Female. — Length, 1-1 0th of an inch (2"55 mm.) The third cephalothoracic seg- 

 ment is much narrower (from side to side) than the first two, but the fourth is again 

 wider, and is produced at the angles into two more or less obtusely triangular projections ; : 

 the fifth segment is very short and narrow, scarcely wider than the first abdominal seg- 

 ment. The five abdominal segments are of nearly equal length, but the first is not so 

 wide as either the second or third, and is not " lunate " ; the second, third, and fourth are 

 lunated, and the fifth abruptly truncated. The caudal lamellae are quite twice as long as 

 1 in tad, ovate, scarcely at all toothed at the inner apical angle, which bears a small seta ; there 

 are two apical and two external lateral setae. The whole length of the abdomen, inclusive 

 of caudal lamellae, is equal to about half that of the cephalothorax. The first cephalo- 



1 In the figure (PI. XLVIII. fig. 2) the fourth segment is drawn as wide as the third ; this is sometimes the case, 

 but in the majority of instances it seems to be as described in the text. 



