244 



THETIS SCIENTIFIC RESULTS. 



Telson strongly convex above superiorly and about one-third 

 the length of the body, with a projecting bracket-like lobe on 

 each side, at about the anterior third; posteriorly the sides are 

 converging and bear a pair of small denticles and three somewhat 

 larger at the extremity; the median denticle extends a short 

 distance beyond the lateral ones. Inferiorly the telson is strongly 

 concave, the margin is slightly thickened but not folded inwards. 

 The last pair of pleopods is operculate in character and adapted 

 to the walls of the telson. 



Eyes black, round, and very prominent. 



Superior antennae with the first two joints dilated ; the first 

 is curved and nearly twice as long as the second ; third joint 



cylindric, geniculate and 

 shorter than the second; 

 ^;aS■&. flagellum consisting of 



about thirteen articula- 

 tions, each furnished 

 superiorly with numerous 

 slender hairs. 



Inferior antennae a 

 little longer than the 

 superior. Joints of the 

 peduncle narrow, cylin- 

 drical, the last much the 

 longest ; flagellum with 

 about twelve articula- 

 tions, each with a few short setse on 

 the superior distal border. 



Mandibles stout, cutting edge with 

 two or three obtuse teeth, and a tuft 

 of simple spines at the base ; molar 

 tubercle large, but not well defined, 

 with a few indistinct subterminal 

 spines. Palp consisting of three 

 subequal joints. 



First maxillse as long as the man- 

 dible ; outer lobe about five times 

 as long as broad, tipped with ten 

 stoutish curved spines ; inner lobe 

 very narrow, nearly equal in length 

 to the outer, furnished at the sum- 

 mit with four blunt spines, the 

 inner pair being longer and stouter 

 than the outer. 

 mandiblk. The second maxillse have the paired 



Fig. '23d. lobes narrow, about four times as 



Frontal Region and Antenna. 

 Fig. 23c. 



