28l 



The antennular peduncle reaches hardly to the tooth on the outer margin of the 

 scaphocerite and the lateral process or stylocerite is obtuse and reaches not yet the distal 

 extremity of the i st article, from which it is rather far distant; 3 rd article a little longer than 

 2 nd , both very short, as in Pont. incisus. 



The antennal scale (Fig. 6jd) resembles closely that of Pont. scnlptus (Bell) [Confer : S. Kemp, 

 The Decapoda Natantia of the Coasts of Ireland, Dublin 1910, Plate XXI, fig. 6ö\; it is in 

 the adult specimen from Stat. 273 2,25 mm. long and 0,78 mm. broad, the greatest breadth 

 a little behind the spine; the scale, 2,9-times as long as broad, is half as long as the 

 carapace, rostrum included, and armed just behind the middle of the outer margin, 

 at four-ninths its length from the base, with a strong acute spine, long 

 0,12 mm., behind which the outer margin is distinctly concave, while in front of it the margin 

 is straight. Terminal spine almost twice as long as that on the outer margin, but of a more 

 narrow shape, 3-times as long as broad at its base ; the spine extends, like in Pont. incisus, 

 by almost its whole length beyond the tip of the lamella and the inner margin of the latter 

 is fringed with very long-, feathered setae. Second joint of antennal peduncle with a small spine 

 at the antero-external angle; the peduncle, that reaches to the distal fourth of the scale, is of 

 a stout shape, being still a little more than half as broad as the latter. 



The external maxillipeds reach by half or two-thirds the ultimate joint beyond the tip 

 ot the lamella of the scaphocerite. 



The i st pair of legs extend by one-fourth the propodus beyond the antennal scale. Upper 

 border of merüs with a spine at the distal extremity, lower outer border sharply carinated from 

 the proximal extremity to just beyond the middle, distal border of outer surface armed with 

 3 spines, that are much smaller than the spine at the far end of the upper. Carpus with 2 

 or 3 spines. Propodus a little more than half as long as the carapace, rostrum included, and 

 3,2-times as long as broad in the middle; thumb formed of a single articulated tooth. 



The second peraeopods (Fig. 6j c) reach a little beyond the carpus of the i st pair. 

 Ischium and merus of equal length, the latter nearly 5-times as long as broad in the middle; 

 carpus two-thirds of the merus and a little longer than the chela; palm (Fig. 67/) very short, 

 measuring one-fourth the length of the chela and just as broad as long; fingers straight, 

 the dactylus a little less broad than the immobile finger, that terminates in a single unguis, 

 measuring one-third of the finger, dactylus with two ungues. The second legs are fringed on 

 both margins with long hairs; these hairs are on the chela (Fig. 67^), the carpus and the 

 lower margin of the preceding joints very short-feathered, but on the upper margin of the 

 basipodite, the ischium and the merus long-feathered. 



The three posterior legs resemble those of Pont. incisus, the very slender, tapering and 

 slightly curved dactyli of the 4 th and 5 th pair measure almost three quarters the length of 

 the propodus. 



In the female the outer branch or exopodite of the 2 nd pleopod (Fig. 67/, b-j in) is 

 well-developed, hardly shorter than the protopod, 4-tirnes as long as broad and clothed with 

 long feathered setae; the endopodite, which is 5-times as long as wide proximally, is a little 

 more than half as long as the outer branch, though it reaches only to the middle of it. The 



SIBOGA-EXPEDITIE XXXIX a 3 . 36 



