145 



fig. 13). The second and third segments are of a-bout equal length. The anal segment is equal 

 to two-thirds of the length of the third segment. The furcal joints are one and a half times 

 longer than broad. They are slightly longer than the third abdominal segment. The second 

 and third inner setae are each furnished with a dense tuft of dark coloured hairs. The ova are 

 few in number and are verv larsfe. 



The antennules are composed of twenty joints and are of nearly equal length. The 

 left antennule extends to the end of the fourth abdominal segment. The terminal joint of the 

 right antennule only is furnished with two densely plumose setae (Plate XLIII, fig. 14). 



The antennae, mandibles, maxillae and maxillipedes are somewhat similar to those of 

 Arietellus setosus. 



The first four pairs of feet are also similar to those of that species. 



The fifth pair is slightly asymmetrical. Each foot consists of a single joint. There is no 

 distinctly defined basal part. The proximal portion of the outer margin is furnished with a 

 moderately long seta. The setae on the right foot is longer than the one on the left foot. 

 The distal portion of the outer margin bears two very small hairs. The apex is furnished with 

 one long plumose seta (Plate XLIII, fig. 16). 



Male — length 3,37 mm. 



The male resembles the female in general appearance, but the abdomen is composed 

 of five segments. The first and third segments are larger, and the second is smaller than the 

 others. The fourth and fifth segments are of about equal length. 



The left antennule is modified for grasping. It is composed of eighteen joints. The 

 eleventh, twelfth and thirteenth joints are distinctly enlarged. The fifteenth, sixteenth and 

 seventeenth joints are furnished on the upper edge with a narrow hyaline plate. The hinge is 

 situated betueen the sixteenth and seventeenth joints (Plate XLIII, fig. 18). 



The mouth organs and swimming feet are nearly similar to those of the female. The 

 inner margin of the second joint of the endopodite of the antennae is fyrnished with a long 

 seta (Plate XLIII, fig. 15), which appears to be entirely absent in the female. 



The fifth pair is large and prehensile. The second joint of the right exopodite is lamelliform. 

 It is much dilated at the middle. The apex is narrow and sinuous. The inner margin of the 

 joint is distinctly notched. The second joint of the left exopodite is broadly triangular in outline. 

 It is well supplied with muscles. The apex of the joint bears two moderately long curved spines. 

 The spines are rather shorter than the joint. The distal end of the inner spine is sickle-shaped. 

 The apex of this spine is distinctly bifurcate (Plate XLIII, fig. 19). 



This species appears to come very close to Wolfenden's type species {Paraugaptilus 

 buchani) and I was inclined at first to regard it as identical. Dr. Wolfendex, to whom I 

 submitted copies of the figures now given, is of the opinion, however, that it is distinct. The 

 fifth pair of the female of the present form differs from Wolfexdex's species, in having two 

 small outer edge hairs near the distal end of the joint. The male of the genus has hitherto 

 been unknown. 



Occurrence. Males and females were found in the plankton collected at the 



follouïngr stations. 



145 



SIROGA-EXPEDITIE XX Xa. 19 



