REPOET ON THE SCHIZOPODA. 147 



flagellum was partly broken off in the specimens examined, and innone of them would 

 appear to have had any considerable length. 



The second pair of legs (see fig. 6) are relatively much shorter and stouter than in 

 any of the three preceding species, not nearly attaming the length of the body. Of the 

 joints, the meral is appreciably longer than the carpal. The propodal joint (fig. 8) is 

 rather swollen, and has, as in the two preceding species, at the end, interiorly, three 

 curved spines, one of which is very elongate. The terminal joint is conical in form, and 

 bears five spines, three apical and two lateral. 



The copulatory appendages of the two first pair of pleopoda in the male (see figs. 

 9, 10) are rather fully developed, more especially those of the first pair (fig. 9), and 

 exhibit a structure somewhat resembling that in Stylocheiron carinatuvi. 



Both the telson and the uropoda appear rather more elongate than in the three 

 preceding species, the inner plate of the uropoda, in particular, being greatly produced, 

 and reaching appreciably beyond the tip of the telson. 



The remarkably developed luminous globules occurring at the bases of the pen- 

 ultimate pair of legs are distinctly perceptible in the male specimen (fig. 6) shining- 

 through the integument ; and, moreover, a supplementary lens may be seen in front of 

 each globule, precisely as in the male of Stylocheiron carinatum. 



Habitat. — The two above mentioned specimens were taken at the surface of the sea, 

 both in exactly the same locality, along -^-itli specimens of Thysanoessa gregaria and 

 Nematoscelis megalops ; March 1876, South Atlantic. 



41. Stylocheiron ahhreviatwn, G. 0. Sars (PL XXVII. figs. 11-13). 



Sti/Iocheiron ahbreviatum, G. 0. Sars, Preliminary Notices on the Challenger Schizopoda, No. 39. 



SpeciJiG Characters. — Form of body exceedingly short and thickset. Carapace 

 remarkably shortened, with a slight rounded crest above ; rostrum rather large, straight, 

 lanceolate, tip very acute and somewhat deflexed. Last caiadal segment longer than 

 preceding. Eyes enormously developed, pedicle very tumid, cornea narrowed in its 

 upper part. Antennular peduncle elongate and slender, the two outer joints subequal. 

 Antennal scale projecting beyond second joint of antennular peduncle, sublinear, apex 

 narrowly truncate, outer corner armed with a very small tooth. Second pair of legs 

 shorter than body, carpal joint only half as long as meral, propodal joint rather elongate, 

 and forming, together with the terminal, a complete chela. Inner plate of uropoda a 

 trifle longer than outer. Length 8 mm. 



Remarhs. — This species can, at the first glance, be recognised by its very short and 

 thickset body, its enormous eyes, and the peculiar structure of the second pair of legs, 

 the two outer joints of which form together a complete chela. 



