316 University of California Publications in Zoology. ["Vol.6 

 Aetideopsis divaricata, n. sp. 



PI. 28, figs. 27, 29, 31, 32; pi. 31, figs. 88, 102. 



Adult female. This species closely resembles the preceding 

 one, but is easily distinguished from it by the form of the head 

 ii ml rostrum (pi. 28, figs. 29, 32). The rostral prongs are very 

 long and strong; they curve backward somewhat and are set far 

 apart at the base, from which they diverge but little (pi. 28, fig. 

 32). The last thoracic segment is produced laterally into strong 

 points (pi. 28, fig. 31). This species also shows the distinct line 

 between the fourth and fifth thoracic segments (pi. 28, fig. 31). 

 The abdomen is 4-segmented and, with the furca, is from one- 

 fourth to one-fifth as long as the eephalothorax ; the genital seg- 

 ment is as long as the next two together, and the third and fourth 

 segments are of equal lengths (pi. 28, fig. 31). 



The anterior antennae are 24-jointed and extend back to 

 about the middle of the abdomen. The other cephalic appen- 

 dages are not unusual; the posterior maxillipeds are much like 

 those of A. pacifica (pi. 32, fig. 113). The first foot has a 3- 

 jointed exopodite, each joint with an outer marginal spine (pi. 

 31, fig. 88). The inner ramus of the second foot is 1-jointed but 

 there is some indication of a line of fusion between two joints; 

 the inner rami of the third and fourth pairs are 3-jointed. The 

 teeth on the terminal spines of the outer rami second to fourth 

 pairs of feet are long and more closely apposed for the greater 

 part of their length than in A. pacifica (pi. 31, figs. 102. 103). 



Length: 3.36mm. 



Coloration: Opaque white in formalin. 



Occurrence: On the same stations as A. pacifica. 



Genus Gaidius Giesbrecht. 

 Gaidius tenuispinus Sars. 



PI. 28, fig. 26; pi. 29, fig. 64. 



Chiridius tenuispinus, Sars (1900), p. 67, pi. IS; (1903), p. 30. pi. 18 

 (female). 



Gaidius tenuispinus, Sars (1903), p. 162. pi. IS and supp. pi. 6. 



Adult male. Similar to G. pungens Giesbrecht but distin- 

 guished from it by the much longer and more slender spines on 



