264 Annals of the South African Museum. 



ingeni); 35 4' S. 18 37' E. and Kerguelen Is. (Stebbing: P. fal- 

 catus) ; 42 43' S., 82 11' W. and Philippine Islands (Stebbing : 

 P. validus) New Zealand and neighbouring islands (Thomson and 

 Chilton) ; Ceylon and Zanzibar (Walker) ; South Orkneys (Chilton) ; 

 Falkland Islands (Stebbing). 



GEN. ISCHYEOCEEUS Kroyer. 



1838. Ischyrocerus Kroyer, Danske Selsk. Afh. vol. 7, pp. 283, 287. 

 1894. G-. O. Sars, Crust. Norw. vol. 1, p. 587. 



1900. ,, Chevreux, Et's. Camp. Monaco, vol. 16, p. 104. 



1906. Stebbing, Das Tierreich, 21, pp. 657, 739. 



ISCHYROCERUS ANGTJIPES Kroyer. 



1838. Ischyrocerus anguipes Kroyer, Dauske Selsk. Afh. vol. 7, p. 283, 



pi. 3, figs 14rt-*. 

 1894. -\-miimtus G-.O. Sars, I.e. pp. 588, 589, 



pi. 209, pi. 210, fig. 1. 



1906. ,, ,, Stebbiug, I.e. p. 658. (Eeferences and 



synonyms.) 



1907. ,, von der Briiggen, Ann. Mus. Zool. St. 



Petersb. vol. 11 [1906], p. 236. 



Body slender in $ but rather stout in $ , iridescent. Lateral lobes 

 of head somewhat obtuse. . Eye small, oval. Side-plates 1-4 in- 

 creasing in depth in $ , 1 narrowed below, 5 rather shallower, in $ 2-5 

 subequal in depth. Postero- lateral angle -of 3rd pleon segment 

 quadrate. 



Telson broader than long, margins convex, apically imiuded, with 

 2 submediau apical spines. 



First antenna, 3rd joint longer than either 2nd or 1st, flagelhnn 

 equal to 3rd joint plus half the 2nd, 5-jointed, accessory flagellum 

 very small but distinct (in <$ 1st antenna lost). 



Second antenna a little longer than 1st, ultimate joint longer than 

 penultimate, flagellum equal to or a little longer than ultimate joint, 

 6-jointed in $ , 5 in ? . 



Mouth-parts as figured for I. anguipes Kroyer by Sars (I.e. pi. 209), 

 but distal margin of upper lip a little more convex and 2nd joint of 

 maudibular palp comparatively shorter and more angular on inner 

 margin. 



First guathopod, 4th-6th joints rather slender, 5th elongate, nearly 

 ^ length of 2nd, inferior margin with a rather long but not promi- 



