REPORT ON JAPANESE STOMATO POD A 



143 



5. Gonodactylus spinosocarinatus n. sp. 



Pl. IV. Figs 2, 2 a. 



Diagnosis. — Body elongated. Antennules and antennae short, 

 antennal scales small. Rostrum with a slender median spine and 

 acute antero-lateral angles. Carapace slightly vaulted, with rounded 

 corners. Hind body strongly convex ; first five abdominal segments 

 smooth above, with marginal carinas, the sixth provided with six 

 unarmed longitudinal carina:. The whole dorsal surface of telson, 

 except the flattened submedian marginal spines, covered with nine 

 broad longitudinal carina;, which arc smooth above but beset with 

 numerous minute spinules on the sides. Only the submedian spines 

 well developed, the others being obsolete. Basal prolongation of 

 uropod with broad and flattened outer spine ; some of the marginal 

 spines on the proximal segment of exopodite large and curved. 



Description —The rostrum is transverse, with acute median spine, 

 the tip of which does not reach halfway the length of eye-peduncle ; 

 antero-lateral spines also with aeute terminations. The carapace is 

 slightly convex; its length about 1/5 the total length of body, and 

 i'/ 3 the width between the antero-lateral angles, which is about 

 equal to that of the sixth thoracic segment. The gastric sutures are 

 well-marked, diverging a little posteriorly. All angles are obtuse and 

 rounded. The posterior margin is straight, but the antero-lateral lobes 

 project forward. The hind body is strongly convex and elongated ; 

 the fifth thoracic segment slightly narrows laterally ; the lateral edges 

 of the next two segments are truncated, while the last segment 

 produces a blunt process on each side. The first abdominal segments 

 increase gradually in length backwards ; they are smooth above and 

 are provided with lateral marginal carina;. All the postero-lateral 

 angles are rounded and do not project backward. The length of the 

 sixth segment is almost equal to that of the second and is provided 

 with six somewhat irregularly-marked longitudinal carinae, the space 



