510 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



stout spine, directed backward. The coxopodites are distinct the 

 entire length of the first segment on the under side and each is in 

 the form of a ridge, ending in a bifurcate tooth-like process. The 

 second thoracic segment has the coxopodites of the under side in 

 the form of tooth-like processes. The lateral spines of the second, 

 third, fourth, fifth, and sixth segments form two longitudinal series, 

 one on either side of the median line, halfway 

 between that and the lateral margin, and in 

 line with those of the first segment. The spines 

 of the seventh thoracic segment are, however, 

 nuich closer together and are also much longer. 

 The seventh segment is produced backward 

 about the center, so that it is longer at that 

 point than at the sides. The lateral portions 

 of the second, third, fourth, and fifth segments 

 are drawn out in narrow rounded processes, 

 slightl}^ curving upward at their extremities. 

 The sixth and seventh segments have the lateral 

 portions drawn out in processes which are some- 

 Avhat truncate at their extremities. All these 

 segments are thickly tuberculate except at the 

 sides and on the anterior por- 

 tion, where the segment artic- 

 ulates with the one inunedi- 

 ately anterior to it. 

 The first two segments of the abdomen are con- 

 cealed ])v the last thoracic segment. All the abdom- 

 inal segments are tuberculate. One tubercle in the 

 median line of the third segment is somewhat enlarged and more 

 prominent than the others. One tubercle in the median line of the 

 fourth segment is slightly more enlarged than the tubercle of the pre- 

 ceding segment. A long stout spine directed hack- 

 ward is present on the fifth abdominal segment in tiie 

 median line. At the base of the terminal segment is a 

 large prominent tu))ercle, ver}" much larger than those 

 of the third and fourth a])dominal segments. The ter- 

 minal segment is triangularly shaped, with the apex 

 l)roduced in a truncate i)rocess. The basal segment of 

 the ui-opoda, seen from the dorsal side, is large, wider 

 at the base than at the apex, filling the space between the lateral proc- 

 ess of the fifth abdominal and the terminal abdominal segment, and 

 continuing the oval outline of the body. The outer ]»ranch is very 

 small and is inserted at the posterior angle of the basal joint. The liasal 

 joint, seen from the under side, is very large, triangular in shape, the 

 basal joint of either uropod meeting in the median line at the upper 



Fig. 1.— Pskudarmadu 

 gillianus. x 5. 



Fig. 3.— Latekai- 

 view of abdo- 

 MEN. :■. 5. 



