I:m| Esterly: Copepoda of tht San Diego Region. 325 



so that the rostral filaments arc covered. The filaments are deli- 

 cate, not situated on a prominence, and widely separated at the 

 base. The last thoracic segment ends in a small, pointed pro- 

 jection (pi. 29, fig. 53). The cephalothorax is 4-segmented, the 

 head being fused with the first thoracic segment. The ahdomen 

 is 4-segmented; the genital segment is as long as the second and 

 third together and the anal is very short (pi. 29, fig. 53). 



The anterior antennae are 24-jointed and from one-fifth to 

 one-sixth of their length longer than the body. The outer ramus 

 of the posterior antennae is one and one-half times tin. length of 

 the inner ramus. The anterior maxillipeds have eight vermiform 

 appendages. The first four pairs of feet are of the usual form; 

 the second joint of the inner ramus in the second, third and 



fourth pairs has a proximal row of thr r four long spines and 



a few short ones, and a distal row of from three to five short 

 spines; the joints of the outer rami are not spinose on the flat 

 surfaces. The fifth foot (pi. 31, fig. 95 I . is .3-jointed, the terminal 

 joint with four heavy spines, two of which are on the distal mar- 

 gin of the foot. 



Length : 4.25 mm. 



Coloration: Whitish and translucent in formalin. 



Occurrence: Station 146S, vertical from 290 f., sounding 330 f., June 

 19, 1908. 



Xanthocalanus pulcher n. sp. 

 PI. 29. Bgs. (in. 61; pi. 31, fig. 91. 



Adult female. The head has a long, low crest, and the ros- 

 trum consists of two slender filaments i pi. 29. fig. til). The last 

 thoracic segment ends laterally in a small, sharp projection (pi. 

 29. fig. lid ) . The genital segment of the abdomen I pi. 29, fig. 61), 

 has a slight ventral convexity, and the segment is as long as the 

 third and fourth together; the second and third segments are of 

 equal lengths, and the fourth is the shortest of all. 



The anterior antennae are 23- jointed and as long as the 

 cephalothorax. The maxilla has nine bristles on the outer ramus, 

 five on the second basal, eight on the inner ramus and four on the 

 second lobe of the inner margin. The anterior maxillipeds have 

 six vermiform and two pencillate appendages. 



