no. 1653. SOME NEW ATLANTIC I SO PODS — RICHARDSON. 



487 



in a rostrum (no mention is made of the rostrum in the description, 

 but the figure shows this point) , in the bifurcate antero-lateral angles 

 of the head (this character is also taken from the figure), in all the 

 segments of the thorax with the dorsal surfaces covered with small 

 spines and tubercles, while in Hansen's species the sixth segment 

 (fifth free segment) is described as smooth, the fifth segment 

 (fourth free segment) as ornamented with a few tubercles, the 

 median part being smooth, and the fourth segment (third free seg- 

 ment) as smooth posteriorly. The present species also has more 

 spines on the legs and abdomen, and the arrangement of the spines 

 on the lateral margins of the head and of the segments of the thorax 

 differs from the species figured by Hansen. 



GNATHIA S ERRATA, new species. 



Body elongate, about three times longer than wide. Head covered 

 with small tubercles, the tubercles being denser on the lateral and pos- 

 terior portions. First, second, third, and fifth free 

 segments of the thorax also covered with small tuber- 

 cles; fourth free segment smooth. 



Head large, squarish in shape, with the front pro- 

 duced in the middle in a rostrum rounded anteriorly ; 

 antero-lateral angles acute. In a dorsal view the eyes 

 are not visible; they are placed at the sides of the 

 head and are moderately large and composite. The 

 mandibles are small, not projecting much beyond the 

 rostrum ; curved at base and at the anterior extremity, 

 the inner margins converging abruptly to the narrow, 

 pointed extremity. Just back of the mandibles the 

 anterior margin of the head, seen from the underside, 

 is produced in wheel-like processes, one on either side 

 (not visible from above), edged with six teeth; be- 

 tween these processes the anterior margin is fur- 

 nished with four teeth on either side, which may be 



seen in a dorsal view, as they are 

 situated close to the mandibles at 

 the base of the rostrum. First pair 

 of antennae with a peduncle of three 

 articles, the third the longest, about 

 twice as long as the second, and a 

 flagellum of five articles, the first of 

 which is minute. Second pair of 

 antennas with a peduncle of four 

 articles, and a flagellum of seven. 

 First segment of thorax coalesced with the head ; second and third 

 (first and second free segments) subequal and furnished dorsally with 



Fig. 6. — Gnathia 



SERRATA. 



Fig. 7. — Gnathia serrata. Underside 

 op anterior portion op head. 



