REPORT ON THE COPEPODA. 85 



organs generally as in Pontella; apical portion of the posterior foot-jaw six-jointed. 

 Inner branches of the swimming feet two-jointed. Fifth pair of feet in both sexes con- 

 sisting of one branch only. Abdomen of the female two, of the male five-jointed. 

 Rostrum cloven ; eyes two, small, closely approximated, near the base of the rostrum. 



The smaller number of joints in the anterior antenna, and the unbranched 

 character of the fifth pair of feet in both sexes are perhaps characters sufficiently 

 important to warrant the retention of the generic name originally applied by Dana to 

 this species, though on different grounds. Dana describes two sets of eyes, an inferior 

 and superior, both very minute. In my spirit specimens I have been able to detect only 

 the superior. 



1. Calanopia elliptica, Dana (PI. XXXIV. figs. 1-9). 



Calanopia elliptica, Dana, Crust. U. S. Expl. Exped., p. 1132, pi. lxxix. fig. 6, a.h. 



Length, l-14th of an inch (2 mm.). Cephalothorax elongated, ovate, tapering and 

 rounded off in front, posterior lateral angles sharply spined ; anterior antennae (fig. 2) 

 slender, about as long as the cephalothorax, eighteen-jointed, third and sixth joints 

 extremely short, tenth, eleventh, twelfth, and thirteenth long and slender ; sparingly 

 setose towards the apex, more densely on the proximal half; the principal serrated 

 plate placed on the proximal side of the hinge (fourteenth joint) ; armature consisting of 

 very fine, closely-set setse (fig. 4). The upper' half of the fifteenth joint is also very 

 faintly pectinated, the serrations not being visible except with a high power of the micro- 

 scope. Last joint of the right fifth foot in the male (fig. 7) stout and claw-like, its basal 

 portion expanded, concave margin very irregularly rugose and dentated ; terminal joint 

 on the left side simple, cylindrical, marginally setose near the apex, bearing two apical and 

 three lateral spines, the outer angle of the penultimate joint produced into a strong spine. 

 Fifth pair of feet in the female simple, elongated, cylindrical, penultimate joint bearing 

 a strong apical spine, last joint with three ciliated spines. The second segment of 

 the male abdomen is produced on the right side into an acute angle, the last joint is 

 extremely short ; the caudal stylets about thrice as long as broad and more than equal in 

 length to the last two abdominal segments ; the two central tail setse much longer than 

 the rest, — about equal to the length of the abdomen. 



Habitat. — Off Sibago Island, Zebu Harbour, and at other points off the Philippine 

 Islands. Mr. Dana's specimens were taken in the Straits of Banca, east of Sumatra. 



Pontellopsis, n. gen. 



Head distinctly separated from thorax ; abdomen of female two-jointed (?), and 

 having a pouch-like protuberance on the left" side. Anterior antennae eighteen-jointed ; 



