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The antennules are twenty-jointed and extend to the end of the thorax. 
The antennae, mandibles, maxillae and maxillipedes are similar to those of Poztellopsis 
armata. The apical portion of the second maxillipedes is composed of four joints. 
The four pairs of swimming feet are also similar to those of Poxtellopsis armata. 
The fifth pair of feet is asymmetrical. The inner margin of the right exopodite is produced 
into a strong spine. The exopodite of the left foot is distinctly shorter than the exopodite of the 
right foot. The inner margin has no spine. The endopodites are nearly symmetrical, and the 
apex is bifurcate (Plate LIV, fig. 6). 
Male — length 1,67 mm. 
The male bears a general resemblance to the female, but the last thoracic segment is 
distinctly asymmetrical and the abdomen is five-jointed. The left distal end of the last thoracic 
segment is the same as that of the female. The right side is produced into a moderately 
strong, curved, spiniform process, that extends to the end of the third abdominal segment. The 
right side of the third abdominal segment is expanded. into a well defined tooth. The furcal 
joints are proportionally longer than those of the female (Plate LIV, fig. 7). 
The right antennule is composed of about twelve distinct joints. The three middle joints 
are greatly inflated. The upper margin of the second proximal hinge joint is produced distally 
into a serrate tooth. The lamina on the upper margin of the proximal hinge joint is also serrate. 
The proximal portion of the upper margin of the distal hinge joint is furnished with moderately 
long slender spines (Plate LIV, fig. 9). 
The antennae, mandibles, maxillae and maxillipedes are similar to those of the female. 
The first four pairs of feet are also the same as in the female. 
The thumb-like projection of the first joint of the right exopodite of the fifth pair is 
slender, and is of very remarkable length. The claw-like terminal joint is comparatively short. 
The produced outer distal end of the first joint of the left exopodite extends to near the end 
of the second joint. The second joint is short. It is furnished with one outer marginal spine, 
two sub-apical spines, and one apical spine (Plate LIV, fig. 10). 
The females of this species can readily be separated from any of the other females of 
the genus, by the spines on the dorsal surface of the genital segment. The structure of the 
fifth pair of feet of the two sexes readily distinguishes this species from any of the other 
members of the genus. The remarkably long thumb-like projection of the first joint of the right 
exopodite of the male fifth pair, is sufficient to separate the male of this species, from any 
of the other known males. 
Occurrence. — Seven specimens were obtained from the plankton collected at the 
following stations. 
Stat. 37, 1 female and 1 male. — Stat. 109, 2 females and 1 male. — Stat. 213, 1 female 
and 1 male. 
Genus Pontellina Dana, 1852. 
Pontellina is closely related to the genus Pontellopszs, but the last thoracic segment of 
both the male and female is asymmetrical. The right furcal joint of the two sexes is very 
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