The Sympoila. 139 



median carina, beginning on the eyelobe, is earned right through to 

 the hind margin, on the frontal lobe carrying three conspicuous 

 forward-pointing teeth just as in the Japanese species, but not as 

 there behind these teeth dividing into two tuberculated ridges, nor 

 are the sides of the carapace here tuberculate except for a single pair 

 of tubercles anteriorly outside the frontal lobe. Microscopic denticles 

 can be made out along the centre of the carina and scattered over 

 the minutely squamose surface of the carapace. 



The pedigerous segments after the first are laterally keeled, and 

 after the second have a median pair of carime. There is a slight inter- 

 locking laterally between the third and fourth segments. No ventral 

 spine was found on these segments. The first five pleon segments 

 have each a dorsal and lateral pair of carinae, but the telsonic seg- 

 ment though elevated in the middle is scarcely to be called carinate ; 

 its rounded end is well produced between the bases of the uropods. 



In the first antennae the geniculate first joint is as long as the 

 subequal second and third joints combined ; the small flagellum is 

 three-jointed, with the third joint minute, the sensory filaments 

 long ; the accessory flagellum with its two joints is not nearly as 

 long as the first joint of the principal. The second antennae of the 

 specimen had the usual character for a male not fully adult, giving 

 promise, however, of very numerous joints. 



The mandibles have a strong molar, finely toothed on the apical 

 margin ; the spine-row contains at least a score of spines. The first 

 maxillae show an elongate palp, with two unequal terminal filaments. 

 The second maxilla? with the usual armature appear to be longer 

 th.in usual. The first maxillipeds have the marginal teeth of the 

 ante-penultimate joint apparently simple, although a spine project- 

 ing from below under a low magnification makes the upper tooth 

 seem bifid ; the second joint at the apex of its inner margin shows a 

 tooth of unusual size. In the second maxillipeds the slender second 

 joint is much longer than the five following joints combined. The 

 second joint of the third maxilliped is more than twice as long as the 

 five following joints combined, wider at both ends than in the middle, 

 much produced apically ; the fourth joint is also produced, but is 

 little longer than broad ; the three following joints are narrow. The 

 long first peraeopods have the sixth joint less than twice the fifth 

 and not a fourth longer than the seventh. In the short second pair 

 the sixth joint is not longer than the third, the seventh as long as 

 fifth and sixth combined. Exopods to the third pair were not satis- 

 factorily made out, but may be presumed, as they occur in both 

 sexes of the allied Japanese species. 



