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proximal end of the segment is expanded, and the distal end is slightly contracted. The 

 second segment is one and a half times the length of the third segment. The anal ses/ment 

 is distinctly Ionger than the third segment. The furcal joints are rather short and ovate in 

 shape. The joints are as long as the second abdominal segment. They are furnished with two 

 outer marginal setae and three apical setae (Plate LXVIII, fig. 21). 



The antennules are moderately long and seven-jointed. The second joint is Ionger, and 

 the third joint shorter, than any of the others (Plate LXVIII, fig. 22). 



The antennae are slender and four-jointed. The apex of the fourth joint is furnished 

 with three long slender spines and four setae. The two inner spines are stouter than the outside 

 spine and are fringed on the exterior margin with short hairs (Plate LXVIII, fig. 23). 



The apex of the mandible is stylet-shaped. The basal portion is very broad and its 

 upper margin is coarsely dentate (Plate LXVIII, fig. 24 A). 



The maxillae are rather stout. They are furnished with two marginal setae and two 

 apical setae. 



The apex of the first pair of maxillipedes is produced into a short stout blunt stylet which 

 terminates in a stout spine. The upper margin is armed with six moderately stout teeth. The 

 inner margin of the apical joint is furnished near the base with a strong and finely toothed 

 spine (Plate LXVIII, fig. 25). 



The second pair of maxillipedes is three-jointed. The upper margin of the second joint 

 is furnished with two very stout spines. The outer margin of the proximal spine is armed 

 with eleven moderately long and slender spinules. The distal spine has a fringe of short hairs 

 on the inner margin. The third joint is short. It terminates in one long moderately stout 

 and curved claw and two short spines (Plate LXVIII, fig. 26). 



The exopodites and endopodites of the first three pairs of feet are three-jointed. The 

 exopodite of the fourth pair of feet is three-jointed. The endopodite is one-jointed. 



Male unknown. 



This species bears a close resemblance to Pseurfaiitliessius propinquus T. Scott (1893), 

 but the female is easily separated by the quite different armature of the second pair of maxil- 

 lipedes. The proximal spine on the second joint in Psettdanthessius propinquus has no fringe 

 of long spinules and there is no long apical claw on the third joint. 



Occurrence. — One specimen was obtained from the surface plankton collected at 

 Station 35. 



3. P seudanthessius parvus nov. sp. Plate LXIX, figs. 1 — 7. 



Female — length .9 mm. 



Seen from above, the body appears elongate and narrowly ovate. The frontal margin 

 is narrowly rounded. It is almost angular in outline. The fourth thoracic segment is very little 

 produced and the distal ends are rounded. The fifth thoracic segment is of moderate size with 

 the distal end considerably expanded. 



The abdomen is composed of four segments. The combined length of the abdomen and 



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