338 



DISCOVERY REPORTS 



hairs ; the fourth joint is about three times the length of the second, and the fifth over 

 twice as long as the fourth ; bundles of fine setae arising from round knob-like bases are 

 scattered over the ventral surfaces of the third, fourth and fifth joints. The flagellum is 

 not much longer than the fifth peduncular joint ; its first two joints are sub-equal and 

 twice as long as each of the remaining four ; the terminal joint bears a bunch of fine setae 

 at its extremity. 



The mouth-parts are built up in the normal way. The cutting edge of the left mandible 

 has its primary edge divided into three teeth ; the secondary one is in the form of two 

 spines, one of which is truncate with a broad rounded extremity: the secondary cutting 

 edge of the right mandible is in the form of two spines, the inner one of which is larger 

 than the outer. 



Fig. 15. Serolis orbiculata, n.sp. 



a, maxillipedofcJ: x 75. 6, second thoracic appendage of t?: x 35. c, third thoracic appendage of 

 adult cj: X 50. </, fourth thoracic appendage of cj : x 50. e, eighth thoracic appendage of cJ : x 60. 

 /, uropod: x 50. 



The maxillula (Fig. i b) has nine spines on the truncate extremity of its outer lobe ; 

 its inner lobe is small, curved, not expanded distally, and with a small seta at its rounded 

 end. The maxilla (Fig. i e) resembles that of S. nototropis, n.sp., and differs from that 

 of all other species in having only one articulating lobe. This lobe (L^) is less well de- 

 veloped than in S. nototropis and bears only two pectinate setae. The lobe is continuous 

 with the segment from which it arises, and the latter appears also to be continuous with 



