271 



one- fifth the length of the rest of the carapace and is 5-times as long as broad in the 

 middle; the lateral margins arc armed with two pairs of strong, forwardly directed spines, the 

 anterior pair arising just from the middle of the rostrum, the posterior near its base. The 

 rostrum rises from the carapace obliquely upward and from the posterior pair of spines runs 

 almost horizontally forward; on the sides of the rostrum feathered setae are implanted, while a 

 few hairs exist on the upper surface. Of the two median spines (Fig. 64a) on the gastric region the 

 posterior stands at the anterior fifth of the carapace, the anterior twice as far from the posterior 

 as from the level of the orbital margin; looked at from above the posterior spine appears 

 3-times as long as the anterior. Between the two spines the carapace is sharply carinated and 

 from the posterior spine a prominent, though rather obtuse crest runs backward, fading away 

 at the posterior si.\th of the carapace. Orbital spine reaching to the middle of the cornea, 

 directed obliquely upward ; midway between this spine and the rostrum the orbital margin is 

 notched, the inner angle of the notch is rather acute, though not spiniform and from this notch 

 a furrow runs backward and outward, which soon passes into a fine suture that is directed 

 straight backward, though reaching probably not so far as the median crest. A little behind 

 and outwards of the orbital notch a minute spine occurs on the upper border of the furrow, 

 like in Pont, abyssi S. I. Smith, occidetiialis Faxon and other forms. Branchiostegal spine long, 

 reaching a little beyond the level of the anterior border of the eyes and directed outward and 

 forward. The lateral spine, which is also not buttressed by a carina, appears as large as the 

 posterior gastric spine and is placed at the same level as the latter. 



The abdomen, telson included, is 2 '/3-times as long as the carapace. The tergum of the 

 3''^ somite is slightly prominent backv/ard, so that the posterior margin, when looked at from 

 above, appears triangular with obtuse tip, for the rest the i^' to 5'"^ terga are smooth and 

 rounded. Sixth somite 3 mm. long, almost twice as long as the 5"^, upper surface grooved 

 longitudinally, the groove very shallow. Telson 3,76 mm. long, one-fourth longer than 6''' 

 somite, tapering backward anteriorly more strongly than posteriorly; the tip is 0,22 mm. broad, 

 '/)- the length of the telson, but, on the level of the posterior pair of dorso-lateral spinules, 

 the telson is hardly one and a half as broad as at the tip. The telson, which is faintly grooved 

 about to the posterior third, bears two pairs of dorso-lateral spinules, the anterior pair, that 

 are 0,1 mm, long, are implanted immediately before the middle, the posterior pair, 0,12 mm. 

 long, at the posterior third; the acute tip (Fig. 64^) is flanked at either side by 3 spines, the inner 

 pair are very long, 0,75 mm., one-fifth the length of the telson, and feathered, the following 

 pair are glabrous, project only by half their length beyond the tip and measure little more 

 than one-third the length of the submedian pair; the outer pair, finally, 0,1 mm. long, at the 

 posterior extremity of the lateral margins, measure one-third the length of the intermediate 

 pair. The narrow inner uropods reach, beyond the tip of the telson, to the middle of the 

 submedian pair of terminal .spines, the outer uropods are distinctly shorter, reaching to the 

 posterior extremity of the lateral margins of the telson, their apex is rounded and without diaeresis. 



The eyes, which are large, their greatest diameter being in proportion to the length 

 of the carapace, rostrum included, like i : 7,5, are of a pale sooty colour, the inner margin 

 more blackish. 





.-^^ 



