258 



K. NAKAZAWA : 



two-thirds of its length from base, distal joint longer than twice its 

 breadth at base ; outer distal margin of the proximal joint provided 

 with a row of 8-10 spines, the row not extending into posterior half 

 of the margin. Inner brandi of uropod much shorter than the outer. 

 Length of body 10. mm. 



Locality. Near Misaki. 



Notes. — The characteristic points of this speciej lie in the third joint of anlennules being 

 longer than the first ami in the strongly curved dactylopodtie, 



Order EUPHAUSIACEA 

 Genus Stylocheiron G. O. Sars, 1883. 



13. Stylocheiron orientalis n. sp. 

 Plate VIII., figs. I, 15, 16, 21. 



Diagnosis. Carapace short, slightly keeled above, with long 



and sharply pointed rostrum (fig. 1). Antennular peduncle sexually 

 different ; in the female it is longer, the two last joint being especially 

 more slender than in the male ; basal joint stout, longer than the 

 other two joints taken together, but considerably flattened above, with a 

 short stout spine on the outer distal margin. Mandible with reduced 

 masticatory surface and no mandibular palp (fig. 15). Second maxilla 

 lamellose, its exopodite elongate. Exopodite of first thoracic limb 

 composed of many joints with a few long spines, while that of other 

 thoracic limbs is two jointed. First and second pairs of legs feebly 

 developed (fig. 16); meropodite of second leg much lengthened. Third 

 l e S (fig- 2I ) very slender, its meropodite longer than any other joint 

 of the leg, the terminal joint with three long and two short spines, 

 not chelate ; propodite longer than carpopodite. Gills and luminous 

 organs as in other species of the genus. Average length of body 

 9.3 mm. 



