526 



23. Cheirocratus robustus, G 0. Sars, n. sy. 



(PI. 18.5, fig. 2). 



Body comparatively shorter and stouter than in the preceding species, 

 otherwise of a very similar appearance, and having the urosome armed in 

 the very same manner. Cephalon shorter than the first 2 segments of 

 mesosome combined, postantennal corners projecting somewhat beyond the 

 lateral ones. Coxal plates comparatively still smaller than in C. SundeivaUi , 

 1st pair rather expanded distally; 2nd pair in male but little deejier than 

 the others. Last pair of epimeral plates of metasome considerably produced 

 at the lateral corners. Eyes small, rounded. Superior antennae fully as 

 long as the peduncle of the inferior ones, with the flagellum exceeding the 

 length of the peduncle, and composed of about 22 articulations. Inferior 

 antennae with the last 2 joints of the peduncle nearly equal-sized. Anterior 

 gnathopoda with the propodos fully as long as the carpus. Posterior 

 gnathopoda in male very strongly built, and less elongated than in C. 

 Simdewalli , propodos of quite an unusual size, being much tumefied and 

 regularly ovate in form, lower edge evenly curved and, like the greater part 

 of the inner face, densely clothed with numerous comparatively short bristles 

 forming a dense fur, palmar face, lying inside the propodos, slightlj' concaved, 

 and armed with only a single irregular tubercle. The 3 posterior pairs of 

 pereiopoda unusually strongly built, especially in the male, last pair much 

 the strongest, and having the outer joints very broad and compressed, and 

 the dactylus short and stout, basal joint oblong quadrangular in form, with 

 the hind edge distinctly serrate. Last pair of uropoda nearly as in C. 

 Sundewalli. Telson broader than it is long, cleft rather wide, terminal lobes 

 each armed at the tip with about 5 spines, none of which is distinguished 

 b}- any considerable length. Colour pale yellow with small red spots. 

 Length of adult male nearly 10 mm. 



Remarks. — Though nearly related to C. Sundewalli, this new species 

 is fairly well distinguished by its more robust form of body, the somewhat 

 different structure of the posterior gnathopoda, and the unusually strongly 

 built posterior pereiopoda 



Occurrence. — I have met with this form occasionally in the Trond- 

 hjemsfjord, and recently also in the Christianiafjord, in moderate depths. 

 Among a number of specimens of C. SundeivaUi, collected many years ago 

 off the west coast of Norway, I also found some specimens of the present form. 



