COPEPODS OF THE WOODS HOLE REGION 



27 



segment, forming two to four closely arranged lines of spots, more or 

 less continuous in the second and third segments, but much broken 

 posteriorly. Midway down the sides another marked line of these 

 spots occurs, being continuous from the posterior end of the first 

 segment to the posterior end of the fifth segment. Between the 

 lateral lines and the back are a few scattered and broken series of 

 spots. From the lateral lines to the ventral margins this color forms 

 broad bands at the junction of the segments, and occasional smaller 

 ones between. The mouth appendages are whitish. There is a small 

 internal reddish spot behind the snout and another much larger 

 one farther back, neither of which 

 seems in the right position for the 

 eye (Rathbun). 



Female. — Metasome two and a 

 half times as long as wide; head 

 with a low crest; genital segment 

 swollen both centrally and dorsally, 

 decidedly wider and thicker than it 

 is long. First antennae reaching at 

 least 6 segments beyond the tips of 

 the caudal rami ; fifth legs symmetri- 

 cal, the endopods extending nearly 

 to the center of the last segment of 

 the exopod. Total length, 12-13.5 

 mm. 



Male. — Unknown. 



Remarks. — T h e specimens that 

 served as the types of Brady's spe- 

 cies were obtained from our own 

 Atlantic coast, not far from the two 

 Fish Hawk stations where the pres- 

 ent specimens were found, but in 

 deeper water (1,250 fathoms). 



This is the largest of our copepods and may be recognized by that 

 fact alone ; the first antennae also are nearly one-half longer than the 

 whole body. Brady said of his specimens mentioned above : " I am 

 disposed to think, seeing that all the specimens have been obtained 

 from the dredge, that this species is really an inhabitant of the deep 

 sea." 



Genus NEOCALANUS Sars, 1925 



Head separated from, or fused with, the first segment ; fourth and 

 fifth segments separated; first antennae reaching well beyond the 

 caudal rami. All five pairs of legs biramose, the rami 3-segmented ; 

 anterior surface of basipod of first legs with or without a spine ; end 



t 



FiGUEE 12. — Megacalanus prinoeps: 

 a, Female, dorsal ; h, fifth leg 



