BO. 1 658. 



SOME NEW ITLANTIC IS0P0D8 RICHARI 



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

 but the figure shows this point i. in the bifurcate antero-latera] angles 

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

 ngments 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 pari being smooth, and tin' fourth segmenl (third free seg 

 incut) 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 tin' thorax 

 differs from the species figured by I Ian-en. 



GNATHIA SERRATA, 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 lame, squarish in shape, with the front pro 

 duced in the middle in a rostrum rounded anteriorly; 

 antero-latera] 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 tic anterior extremity, 

 the inner margins converging abruptly to the narrow. 

 pointed extremity, dust hack of the mandibles the 

 anterior margin of the head, -ten 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 i- fur- Fl ° 



nished with four teeth on either side, which may be 



-ecu in a dorsal \ iew, a- t hey are 

 situated close to the mandibles at 

 the ha-.' of the rostrum. First pair 

 of antenna' wit h a peduncle of t hive 



articles, the third t he longest, about 



twice a- Long as i he SCCOnd, and a 



fiagellum of five art icles, the first of 



which i> minute. Second pair of 

 antenna' with a peduncle .if four 

 art icles, and a fiagellum of seA en. 

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

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



Gnathi v 



Kl<;. 7. ( ; \atii ia SERB \ i a 



.IK A\ IKKI.'K POT PION 



Underside 



IIKAIi. 



