98 



subacute tooth, the margins of which are curved and with a transverse row of setae on either 

 side and which tooth is a little broader than high ; this finger bears moreover a lower prominence 

 distally. Dactylus with a rounded toolh in the middle, smaller than the basal tooth of the other 

 finger, and with a lower, also rounded prominence beyond it; terminal claws of the fingers 

 conical, crossing one another. While the fingers bear several tufts of setae, the palm is nearly 

 smooth and glabrous. 



The peraeopods of the y^ pair (Fig. 22;;/, 22 u, 220) show a remarkable character, 

 which was still unknown, namely the fact that the dactyli have a different form in the male 

 and in the female, a sexual dimorphism therefore. The legs of the 3'''' pair reach in the male to 

 the tip of the rostrum ; the mcrus is about one and a half as long as the ischium, 6-times as 

 long as broad and armed on the distal half of its lower border with three conical, stout 

 and subecjual teeth, the first in the middle of the margin, the 3'''^, near the carpal articu- 

 lation, one and a half as far from the 2"'' as the 2'"' from the first, upper margin of ischium 

 and mcrus fringed with feathered setae, shorter setae occur also on the lower margin; carpus 

 3-times as long as thick distally, almost half as long as the merus, with a strong spine at the 

 distal extremity and a similar one on the middle of the lower margin, here and there moreover 

 setiferous; propodus twice as long as the carpus, a little shorter than the merus, nearly lo-times 

 as long as broad in the middle, both margins armed with spines and setae, while three longer 

 spines occur at the far end; dactylus half as long as the propodus, flattened, compressed, 

 5-times as long as broad, slightly curved towards the acute tip and narrowing only from 

 about the middle; the upper margin is armed with 6 spines at subequal distances and 

 these spines are about half as long as the dactylus is wide or a little longer, lower margin 

 with 17 or 18 closely-set spines, that are half as long as those of the upper margin. The 3"^ 

 legs of the ova-bearing female from Stat. 282 agree, excepting the dactylus, with those of the 

 male, but the merus is 5-times and the propodus 8-times as long as broad, a difference owing 

 no doubt to the somewhat smaller size of this specimen; the dactylus, like in the male nearly 

 half as long as the propodus, has a more slender form, being 6 or 7-times as long as 

 broad and, otherwise than in the male, gradually narrows from the base to the tip ; the 

 terminal claw (stylopodite) is comparatively longer, measuring ^^ — '/. the whole length of the 

 dactylus (in the male '/J^ the posterior margin has only s i x spinules that gradually increase 

 in length from the i*' or proximal to the last, like is also the case with the interspaces 

 between them, and there are but three spines on the anterior border, that increase in length 

 from the i^' at the proximal fourth to the 3"' on the middle of the margin, which is 3-times 

 as long as the i*'. 



The legs of the 4''' pair much resemble those of the 3''', both in the male and in the 

 female. The dactyli, however, of the 4''' legs of the male, 4, 5-times as long as broad, more 

 gradually narrow from near the base to the extremity, there are only 3 spines on the anterior 

 margin, like in those of the female, the terminal claw is longer, nearly one-fourth the whole 

 length and there are only 9 spinules on the posterior margin, that are not so close-set as in 

 the 3"' leg and that slightly increase in length. The dactyli of the 4''' pair of the female 

 resemble those of the 3"'. 



