209 



has been described as convex. Antenna! spine acute, small. Antcro-inferior angle of carapace 

 rounded. Carapace smooth, without grooves. 



Abdomen smooth, rounded, anterior and posterior angles of the pleura rounded or obtuse, 

 those of the 5"> and 6"' somite without teeth or spines. Telson of the specimen from Stat. 164 



5.7 mm. long, one-fifth the whole length, strongly tapering backward, the width (0,28 mm.) of 

 the tip being only one-fifth that of the base; the telson is rounded transversely, not 

 grooved longitudinally, pubescent and it appears unarmed to the naked eye, 

 while only by means of the microscope the tv/o pairs of rudimentary, very small spinules can 

 be observed, that are only 0,08 mm. long, the anterior pair .situated at the anterior third (at 



1.8 mm. from the base), the posterior pair just behind the middle (at 3,5 mm. from the base). 

 In the specimen from Stat. 313 the telson tapers a little less strongly, the width of the tip 

 being one-fourth that of the base ; for the rest it resembles that of the specimen from Stat. 1 64, 

 but the dorso-lateral spinules are hardly perceptible even by means of the microscope and the 

 posterior pair is situated more backward, at the posterior fourth. At either side the tip bears 

 two spinules, the outer very short, the inner only as long as the tip is broad, conformable 

 to DE Haan's description "spinulis apicalibus valde abbreviatis". In the youngest specimen, the 

 female from Stat. 71, the telson is 2,7 mm. long, 0,7 mm. broad at base and 0,23 mm. at the 

 tip, appearing anteriorly only 3-times as broad as at the tip, so that we may conclude that 

 the telson tapers the more strongly the older the animal is; in this youngest specimen the 

 dorso-lateral spinules are also only perceptible under the microscope, the anterior pair is situated 

 nearly at the anterior third, the posterior at three-fifths the length of the telson from the base, 

 namely at 1,7 mm. 



Concerning the types of Nika japonica Dr. Tescii wrote me that in the two larger dry 

 specimens no spinules were perceptible, at best one observes with a magnifying glass one or 

 two pairs of minute tubercles; in the specimen, preserved in spirit, two pairs of small spinules 

 became visible when magnified lo-times and looked at laterally. 



According to Dr. Doflein the telson of the female should, like in Pi'oc. catialiailata 

 Leach, be furrowed and armed with two pairs of fine spinules, so that at least in the female 

 small spinules, visible for the naked eye, seem sometimes to occur. 



In the specimen from Stat. 164 the eyes reach to midway between the orbital margin 

 and the distal extremity of i^' antennular article. Antennular peduncle in this specimen 5 mm. 

 long, a little more than half as long as the carapace, rostrum included, and slender, i 2-times 

 as long as thick; the 2°'* and the 3'<^ joint, together i,S mm. long, are together a little more 

 than half as long as the distance between the orbital margin and the distal extremity of i*' article, 

 the 2"^ joint is 3-times as long as thick and one and a half as long as the 2,^^\ .stylocerite 

 reaching to the distal third of basal article, with rounded tip. The slender antennal peduncle, 

 of which the 2°"^ joint is unarmed, extends almost to the distal extremity of 2"'' antennular 

 article. The specimen from Stat. 3 1 3 agrees with the described, but the antennal peduncle 

 extends to the distal extremity of the 2"'' joint of the antennular peduncle. Scaphocerite in this 

 specimen just half as long as the carapace, rostrum included (in the .specimen from Stat. 164 

 both scaphocerites are wanting); terminal spine reaching as far as the oblitjue tip of the lamella. 



SinOGA-KXPEDlTIE XXXIX a'. 27 



