34 PROCEEDINGS OF THE NATIONAL MUSEUM vol.82 



The angles of the last thoracic segment are rounded and hairy. The 

 abdomen (pi. 17, fig. 6) is 3-segmented; the first segment is not ex- 

 panded laterally. There are hairs on the left lateral margin of the 

 third segment. The f ureal rami are asymmetric, about seven times 

 as long as wide and ciliate on the inner margins. The antennae are 

 22-segmented and exceed the cephalothorax. The segmentation of 

 the exopod of the second antenna was indistinct in the material ex- 

 amined. In Plate 18, Figure 3, two central segments are shown. In 

 others only one can be distinguished. In the fifth feet (pi. 17, fig. 5) 

 the distal margin of the second segment of the basipod has a row of 

 spines, and at about one-third of the length of the segment is a small 

 lateral hair. The first segment of the exopod is about three times 

 the length of the second. Both segments of the exopod have slender 

 acute spines at the outer distal angles. The second segment has also 

 two spines at the inner distal angle, one short, the other longer and 

 ciliated. The terminal hook is slender and acute with a short blunt 

 spine on the inner margin of the base. 



In all specimens examined the right egg sac was atrophied; the 

 left contained about eight ova. 



Length, 1.22 mm. 



Male. — The abdomen (pi. 18, fig. 2) is 5-segmented, the second, 

 third, and fourth segments having spines on the distal margins. The 

 furcal rami are short, the length being two or three times the width, 

 and the inner borders are ciliate. The first basal segments of the 

 fifth foot (pi. 17, fig. 4) have acute spines on the posterior surfaces. 

 The second basal segment of the right foot is much wider at the 

 proximal end, on account of a projection from the inner margin; this 

 projection is armed with long acute spines. A diagonal cuticular 

 ridge on the posterior surface is armed on the proximal third with 

 a row of acute slender spines. About midway of the posterior 

 surface are two stout hairs. There are short hairs on the outer and 

 distal margins. On the posterior surface of the first segment of 

 the exopod of the right foot is a stout hair. From the dorsal sur- 

 face near the distal end projects a stout blunt process which is about 

 one-half as long as the segment. There is a long hair at the middle 

 of the inner border and short spines at the inner distal angle. The 

 lateral spine of the second segment of the exopod is situated at about 

 the middle of the outer margin, is straight, about as long as the 

 first exopod, and is denticulate on the margins. The terminal hook 

 is falciform, denticulate on the inner margin, and has two short hairs 

 on its base. There is no endopod on the right foot. The second 

 basal segment on the left fifth foot of the male has long acute spines 



