1088 



CRUSTACEA. 



with it is straight and nearly half this length. The posterior antennas 

 have the branches nearly equal, the apical joint of longer branch about 

 half the first joint of same, and the setse at apex are not quite as long 

 as branch. The joints of the shorter branch are subequal. The 

 ovarian sac contained, ten eggs, and was attached below to the first of 

 the four abdominal joints. 



In the male, the front is low triangular, there being a sub-obtuse 

 angle in the margin at the posterior angle of the antennse, and the 

 centre of the front being prolonged a little and acute. The antennse 

 differ from those of the above, in being a little bent at the eleventh 

 joint from the apex, but without a geniculating joint, and also slightly 

 bent near base ; the setse at apex are hardly longer than the apical 

 joint, and the posterior penult is very short. The genital feet are very 

 long, extending as far as the beak. One is three-jointed ; the first joint 

 very broad and short; the second long, subcylindrical ; the third long 

 subulate ; there is also articulated with the first, a straight and sub- 

 cylindrical joint (the other branch), nearly as long as second joint. 

 The other leg is five-jointed ; the second joint longer than first or 

 third; the third and fourth nearly equal, the former arcuate; the fifth 

 long subulate. 



Figure 3, Plate 77, represents the young of one of the oceanic 

 Calanidse, and we believe of the above species, as it was found 

 abundantly in the ocean where that was common. The body is sub- 

 acute at each extremity, with no distinction of abdomen, and the seg- 

 ments are indistinct. There are three pairs of appendages, each three- 

 jointed. The anterior is stout, with the second joint longest; and the 

 last have a few short blunt setse on the posterior side, which have 

 the appearance of longer hairs broken off. The second pair has a 

 two-jointed base, and two one-jointed branches, with a few setse at 

 apex. The third pair is simple, and has a few setse at apex. 



Length, one-twenty-fourth to one- thirtieth of an inch. Colourless, 

 or a little red about the joints. Abundant, November 3, 1838. 

 Atlantic, latitude 0° 40' north, longitude 18° west. 



EUCH^ETA CONCINNA. 



Cephalothorax nvdus, ellipticus, capite lateraliter arcuatus, angulU 

 posticis paulurn productua et obtusus; feminse l-articulatus, mans 



