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



rather stiff and carried on a projecting lamella that can be seen 

 from the side (pi. 28, fig. 36). 



The cephalothorax is about three times as long as the abdo- 

 men and Eurca; the genital segment is somewhat longer than 

 the second and third segments together, and the furca is as long 

 as the genital segment and half the second one; the third seg- 

 ment is half as long as the genital (pi. 26, fig. 8). 



The anterior antennae exceed the length of the body by their 

 four terminal joints. The posterior maxilliped is very long and 

 slender, the two basal joints being just one-fourth the length of 

 the body. The other appendages do not show any noteworthy 

 characters. 



Length : 4.4 mm. 



Coloration: Semi-transparent and without pigment. 



Occurrence: Station 1252, tow at 310 f., sounding 345 f., July 11, 1906. 



The appearance of the head and rostrum of this species is 

 distinctive. 



Genus Disseta Giesbrecht. 



Disseta, Giesbrecht (1892), p. 63, 369; (1898), p. 112. 

 Disseta, Esterly (1906), p. 71. 



Disseta maxima n. sp. 



PI. 29, figs. 54, 58; pi. 30, fig. 79. 



Adult female. This species resembles D. grandis (Esterly, 

 1906, p. 71), but is larger. The head (pi. 29, fig. 54), is smoothly 

 rounded, as is the last thoracic segment (pi. 29, fig. 58). The 

 abdomen is 4-segmented; the genital segment is as long as the 

 other three together, and the anal segment is less than one-third 

 the length of the genital; the genital eminence is at the middle 

 of the segment (pi. 29, fig. 58). The left furcal blade is longer 

 than the right by about one-third the length of the latter. 



The anterior antennae are very long and slender, one-fifth of 

 their length longer than the body. The fifth feet (pi. 30, fig. 

 79) are of the usual form, but the spine of the second joint of 

 the. outer ramus is unusually long and heavy. It is nearly two- 

 thirds the length of the third joint of the ramus, and from its 



