JOUKNAL OF ENTOMOLOGY AND ZOOLOGY 205 



The thoracic feet (Fig. 3) are about 1.5 mm. hi length, eight in 

 number and biramous. The outer margins are heavily covered 

 with hair, while the inner margins are comparatively smooth. The 

 first four abdominal appendages (Figs. 5, 6) are much larger than 

 the thoracic feet, being 2.5 mm. in length, and are used for swim- 

 ming, like those of the copepods. They are also biramous, the 

 back margin and tip having numerous hairs along the edge, while 

 the inner margins are lineci with many plumous hairs. The first 

 appendage (Fig. 5) is somewhat heavier than the fourth (Fig 6), 

 but the hairs anci spines are arranged in the same relative position. 

 The fifth appendage (Fig. 7) is two-jointed uniramous and small, 

 .9 mm. long. The sixth is one jointed and smaller yet. 



The eight abdominal segments taper oft in size and the last bears 

 a pair of caudal styles (Fig. 8) which are lined with sharp spines 

 along their outer margins. The ends of the styles are armed with 

 two long, sharp spines. 



(Contridutioit from tlie Zoological Lahoratorij of Pomona College.) 



