184 University of California Publications in Zoology [Vol. 11 



(pi. 10, fig. 25). The last segment of the thorax is rounded at 

 the sides and the dorsal margin of the segment is slightly concave 

 (pi. 10, fig. 2). The abdomen is 4-segmented; the genital seg- 

 ment is nearly as long as the second, third, and fourth together ; 

 the fourth segment is short, about one-tenth the length of the 

 first segment (pi. 10, fig. 2). 



The anterior maxilliped has four pencillate sensory append- 

 ages ; the others are vermiform. The outer ramus of the fir.st 

 foot is shown in plate 12, figure 64. The fifth foot is 3-jointed; 

 the distal margins of the first two joints have rows or groups of 

 fine spines ; the third joint carries a long heavy spine on the 

 inner margin and a shorter one on the di.stal end, both set with 

 small teeth or spines (pi. 12, fig. 63). 



Length: 1.8 mm. (cephalothorax 1.35 mm.). 



Coloration: Translucent in formalin. 



Occurrence : Haul 2567. 



Scolecithrix obscura n. sp. 



PI. 10, figs. 18, 21; pi. 11, fig. 35; pi. 12, figs. 53, 57 



Adult female. The head is smoothly rounded and distinctly 

 crested; the rostral filaments are exceedingly delicate (pi. 10, 

 fig. 21). The last segment of the thorax ends on each side in a 

 minute point which is located on the ventral border (pi. 10, fig. 

 18). The head is fused with the first thoracic segment. The 

 abdomen is 4-segmented and the segments and furca are of about 

 equal lengths (pi. 10, fig. 18). 



The anterior maxilliped, as shown in plate 11, figure 35, bears 

 four vermiform appendages and five with tufts at the end. The 

 first foot has a 3-jointed outer ramus, the second joint bearing a 

 very minute spine at the distal end of the outer margin; the 

 third joint has a heavy and much longer spine in that position 

 (pi. 12, fig. 53). The fifth foot is 3-jointed; the third joint has 

 two large spines (one on the inner margin and one at the end) 

 and two minute spines, of which one is at the end of the joint, 

 the other at about the middle of the outer margin (pi. 12, fig. 57) . 



Length: 2.5 mm. (cephalothorax 1.95 mm.). 



Coloration : Rather opaque and without pigment in formalin. 



Occurrence : Haul 2134. 



