220 Annals of the South African Museum. 



were collected at the same time of year, so that we have no idea of 

 the possible seasonal changes in the two sexes. The hand of the 

 2nd gnathopods (ordinary form) attains its distinctive shape much 

 sooner than in T. capensis. Herniaphroditism. may be the cause of the 

 present " abnormal " form. A similar specimen with a 2nd gnathopod 

 approaching the ? form was found among the specimens of Paror- 

 chestia tennis (Dana). (See below.) 



TALORCHESTIA ATJSTRALIS n. sp. 

 (Plate XXVII. Figs. 33, 34.) 



Body not very broad. Eyes round, their distance apart equal to 

 their diameter. Side-plates not very deep, 2 without a strongly pro- 

 duced lobe on upper posterior angle, 5 almost as deep as 4, its lobes 

 subequal in depth, its length equal to H segments. 



Pleon unarmed, postero-inferior angle of segment 3 quadrate, not 

 produced. 



Telsou with apical incision, spinose. 



First antenna reaching in to middle, in 2 to end of penultimate 

 peduncular joint of 2nd antenna, 1st joint a little broader than long, 

 2nd and 3rd much more slender, 2nd 1^ times as long as 1st, 3rd a 

 little shorter than 2nd, fiagellum equal to last two peduncular joints 

 together, 6- jointed in $ , 4 in $ . 



Second antenna reaching in $ to end of 3rd, in $ to end of 2nd, 

 peraeon segment, penultimate joint stout, longer than ultimate, 

 flagellum equal to penultimate joint, 15-jointed in $ , 13 in 5 . Both 

 antennae feebly sjjiuose. 



First maxilla, inner plates with 2 plumose setae, outer plate with 

 9 spines. Remaining mouth-parts as in T. quadrispinosa. 



First gnathopod in $ , 5th joint triangular, with a prominent apical 

 lobe, 6th shorter than 5th, oblong inner apex produced as a subacute 

 lobe, palm concave, finger reaching to end of lobe, unguis as long as 

 finger, extending beyond lobe ; in $ 6th joint simple, shorter than 

 5th, 5th and 6th both with a long stout spine, as well as smaller 

 spines, on inner distal margin, finger and uuguis as in $ . 



Second gnathopod in $ , 6th joint suboblong, greatest width across 

 the defining angle, palm nearly transverse, slightly convex, passing 

 into the slightly shorter hind margin without any prominent angle or 

 tooth, furnished with spines arranged mostly in pairs, finger match- 

 ing pakii, evenly curved ; in $ 2nd joint not expanded on front 

 margin, 4th with a not very produced apical lobe, 5th broadly lobed, 

 6th as long as 5th, apical projection rounded, scarcely upturned. 



