326 University of California Publications in Zoology. [Vol. 6 



The first foot has a 3-jointed outer ramus, the first joint with- 

 out a spine mi the outer margin. None of the feet are heavily 

 spinose on the faces ; the largest spines are on the inner ramus 

 of the second foot and there are none at all on the fourth foot. 

 The fifth fool i pi. 31, fig. 91), is 3-jointed, broader at the distal 

 end than at the proximal, and with three spines on the terminal 

 joint. 



Length : 3.42 mm. 



Coloration: Translucent, with orange pigment in the basals of the feet, 

 in the mouth-parts, anterior antennae and abdomen. 



Occurrence: Station 1134, vertical from 285 f., June 26, 1906. 



The structure of the fifth feet and the presence of a -crest are 

 distinctive characters for this species. 



Genus Onchocalanus Sars. 



I refer the following species to the above genus on account of 

 the resemblance of the anterior maxilliped to Xanthocalanus 

 (Onchocalanus) similis (Esterly, 1906, p. 69, pi. 12, fig. 60). 

 X . similis closely resembles .Y. cristatus Wolfenden, and that 

 species is transferred to the genus Onchocalanus by Farran 

 (1908, p. 49). I found no trace of a fifth pair of feet in my 

 specimen but that was through multilation in dissecting. 



Onchocalanus latus n. sp. 



PL 29, fig. 47; pi. 30, fig. 70; pi. 31, fig. 97. 



Adult female. The body is rather .strongly depressed. The 

 head is rounded both in dorsal and side views and the last thor- 

 acic segment is rounded at the sides. The eephalothorax is widest 

 just behind the suture between the head and thorax (pi. 29. fig. 

 47). The abdomen is 4-segmented ; the genital segment is about 

 twice as long as the second, which is as long as the third; the 

 anal segment is about one-third as long as the preceding one. 



The anterior antennae are as long as the eephalothorax and 

 24-jointed. The inner ramus of the posterior antenna reaches 

 about to the distal end of the second basal of the latter. The 

 anterior maxilliped has one vermiform and six pencillate append- 

 ages; of the latter, four are slender and two very heavy (pi. 30, 

 fig. 70). 



