FEOM THE INLAND SEA OF JAPAN. 435 



hut in the usual horizontal position of the peduncle it does not appear to extend to the 

 extremity of the second joint. As regards its usual shape, the rostrum exactly agrees 

 ■with Miss Rathhun's figure, hut there are only six teeth on the free part ; the gastric 

 tooth is situated at the anterior fourth of the carapace. The six teeth of the free part 

 are equidistant and of equal size except the anterior, which appears distinctly smaller 

 than the preceding ; this anterior tooth is once and a half as far from, the peu ultimate 

 as from the tip of the rostrum. 



The stylocerite of the inner antennae reaches to the end of the first joint, which carries 

 a spine at the far end of its outer border ; the short flagella, which extend beyond the 

 antennal scales, are nearly twice as long as the terminal joint of the antennular 

 peduncles ; they are suhequal in length, hut the upper is a little shorter. The basal 

 joint of the antennal peduncle has no spine at the outer angle or on the distal border 

 of the lower surface ; the outer margin of the scale is very slightly arcuate proximally, 

 and the distal spine reaches as far forward as the laminar portion. 



The last two joints of the external maxillipeds extend beyond the antennal peduncle, 

 reaching almost to the tip of the rostrum ; their exopodite reaches to the end of the 

 raerus-joint. The outer footjaws, as also the legs of the first and of the second pair, are 

 unispinose at base, but the legs of the first pair carry, moreover, a spine at the distal 

 end of the lower margin of their ischium. The legs of the third pair attain the tip of 

 the antennal scales, those of the fifth extend with little more than their dactylopodites 

 beyond the antennal peduncles, while the legs of the fourth pair are but little shorter. 

 The terminal joints of the fifth legs are little more than half as long as their propodites. 



The thelycum does not fully agree with the figure of the original paper ; it is therefore 

 figured afresh (PL 33, fig. 55). 



The stridulating-organ of this species much resembles that of Pen. {Iletap.) akayehl, 

 llathb., but there are only 13 or 14 ridges, which gradually narrow, like the organ itself, 

 towards the anterior end. 



Geographical Distribution. — Mogi, near Nagasaki [Bathbun). 



Pen^us (Parapeneopsis) tenellus, Sp. Bate. 



Perueus tenellus, Spence Bate, Report on the ' Challenger' Maerura, 1888, j). 270. 



Penxus tenellus, Kishinouye, in Journ. Fish. Bureau, Tokyo, viii. no. 1, 1900, p. 22, pi. 6. fig. 3, pi. 7. 



fig. 8 A & B. 

 Pendens crucifer, Ortmann, in Zool. Jahrb., Syst. v. 1890, p. -t51. Tat". 36. fig. 5 a, h. 



One female from the Inland Sea of Japan, captured at a depth between 5 and 20 

 fathoms or more. 



This specimen is not yet full-grown, being 52 mm. long from the tip of the rostrum 

 to the end of tlie telson, whereas, according to Kisliinouye, the female attains a length of 

 75 ram. The body is described, both by Spence iJatc and ivishiuouye, as being smootli 

 and naked ; in tlic present female, however, the carapace is very finely scabrous, being 

 covered rather closely with minute spinules which are only 003-005 mm. long; still 

 smaller spinules occur also on the telson and perhaps here and there on the other 

 segments of the abdomen. 



SECOND series. — ZOOLOGY, VOL. IX. 62 



