FEOM THE I.\LAND SEA OF JAPAN. 417 



2 



to the tip. The toothing-formulae of these specimens are the following : — j two specimens ; 



2 2 ;j *> 



6 four specimens; ^ two specimens; ^ three specimens; {j one specimen. 



According to the woodcuts in Miss Rathbun's excellent work, the lower limb of the 

 rostrvim appears in Spiront. gracilis, Stimpson, and Spiront.fiexa, Rathbun, narrow along 

 its whole length, hardly broader at its base than distally. 



There is no supraorbital spine, the outer angle of the orbital margin terminates in a 

 rounded tooth or lobe, and the antennal spine is of moderate length. In most specimens 

 the antero-lateral angle of the carapace is rowided ; in two specimens only (I'l. 32. fig. 42) 

 a minute pterygostomian spinule occurs on one side of the body, whereas on the other 

 side the carapace is rounded. The third segment of the strongly geniculated abdomen 

 is produced posteriorly to a somewhat compressed hump or hunch, which is bent at a right, 

 though rounded angle. The lateral sides of the third segment are somewhat punctate, 

 near the posterior border, like the others, but also below the upper margin. The 

 fourth segment, distinctly longer than the fifth, is rounded at the postero-lateral angle, 

 but the fifth ends in a sharp tooth ; the sixth segment, which is twice as long or almost 

 twice as long as the fifth, is twice or barely twice as long as broad ; its postero-lateral 

 angle terminates in a sharp tooth. The telson, which is but little longer than the sixth 

 segment and somewhat shorter than the uropods, terminates in a sharp tooth, and of the 

 two spinules on either side of it the outer is half as long as the inner. The upper surface 

 (fig. 44) carries 4, more rarely 5, ijaww of spinules; in seven specimens there are 4 pairs, 

 in two 5, in two 4 spinules are observed on one side, 5 on the other, and in the last 

 individual the telson has 3 spinules on one side and 4 on the other. 



The eye-peduncles, which carry a distinct ocellus close to the cornea, measure a little 

 more than one-fourth the length of the carapace (rostrum excluded). The antennular 

 peduncle (fig. 45) attains to one-third of the antennal scale ; the acuminate stylocerite 

 reaches to the distal end of the first joint, but never beyond it ; the second joint, much 

 shorter than the first, has a spine at its antero-external angle, and the third, half as long 

 as the second, carries also a spine at the distal end of its upper border; the thickened 

 portion of the outer flagellura reaches, in all the specimens, somewhat beyond the middle 

 of the antennal scale. Antennal scale a little longer than the carajiacc (rostrum 

 excluded), slender, six times as long as broad, hardly narrowing distally ; the outer 

 margin is a little concave, and the distal spine is not nearly so advanced as the mem- 

 branous portion ; there is a slender spine at the distal end of the basal joint at the lower 

 side; the peduncle reaches to the middle of the second joint of the antennular peduncle, 

 and the flagellum is little longer than the body. 



The external maxillipeds, though produced a little beyond the antennal peduncle, 

 attain only to one-third of the antennal scale ; they are devoid of an exopodite, the 

 upper margin of the antepenultimate joint terminates in a small acute tooth, and the 

 terminal joint carries 7 or 8 brown-coloured teeth at the distal end. 



The legs of the first pair extend their fingers beyond the basal joint of the outer 

 antennte, those of the second reach to the middle of the antennal scales. The joints of 



