332 University oj California Publications in Zoology. [Vol.6 



half as long as the third. The left blade of the furca is longer 

 than the right. 



The anterior antennae are 22-jointed and a little longer than 

 the body ; the grasping antenna is on the left side and the por- 

 tion distal to the genieulation is 4-jointed. The terminal joint 

 of the inner ramus of the second and third feet has eight bristles. 

 The fifth feet are characteristic and shown in pi. 32, figs. 107, 

 108; the inner ramus of the left foot is 2- jointed. 



Length: 7.3 mm. 



Coloration: Whitish and transparent in formalin. 



Occurrence: Station 1527, vertical from 600 f., sounding 640 f., July 

 2, 1908. 



Genus Augaptilus Giesbrecht. 

 Augaptilus macrodus n. sp. 



PI. 27, fig. 18; pi. 29, fig. 44; pi. 30, figs. 72, 74; pi. 31, fig. S7; pi. 32, 

 fig. 112. 



Adult female. The body is exceedingly robust and the ros- 

 trum very long and heavy; the head is smoothly rounded, and 

 the last thoracic segment (pi. 29, fig. 44) shows a peculiar inden- 

 tation or bay in the posterior border. The cephalothorax is 

 densely covered with fine spines; it is 5-segmented, the head 

 being separated from the thorax ; the head is a little longer than 

 the rest of the cephalothorax (pi. 27. fig. 18). The abdomen is 

 3-segmented and, with the furca, is between one-fourth and one- 

 fifth as long as the cephalothorax; the genital segment is about 

 as long as the second and third together, the second half as long 

 as the third and the furcal blades half as long as the abdominal 

 segments (pi. 29, fig. 44). 



The anterior antennae reach only to the posterior border of 

 the head. The outer ramus of the posterior antennae is longer 

 than the inner ramus and twice the greatest breadth of the sec- 

 ond basal (pi. 30, fig. 72). The blade of the mandible is shown 

 in fig. 74; it has three teeth, two of which are long and curved, 

 the other being shorter and straighter. The bristles of the maxil- 

 lipeds have the cup-like structure of this genus. 



The rami of the feet are 3-jointed. but the third joint of the 

 inner ramus of the third pair has eight bristles instead of six as 



