﻿COPEPODA 



239 



From X. hirtiprs and horcalis, to whicli it is ver\- iicarls- related, it seems to differ hx greater 

 size, by comparatively sliorter antennulae, whicli do not reach to the end of the genital somite, and 

 by 10 instead of 9 setae in tlie exopodite of the antennae. 



78. Xanthocalanus claviger Th. vScott. 



(Text-figs 78 a — d). 



1909. Amallophora claviger 11. sp. Th. Scott, pp. 124 125, ].l. III figs i ir, pi. IV fig.s 13—17. 



Description, l^. Size of male from Thor St. 183 was 4-55 mm.; anterior division 3-22; nro- 

 some i'33 mm. 



The shape of the body is like that of X. horeaUs\ the head has no crest; the rostrnm is 

 broken bnt seems to be fairly long, and is directed .somewhat backward.s. The lateral corners of 



a. .\bdi. 



Text-fig. 7S. Xanthocalanus claviger Th. Scott, fo'. 

 23. 1). Pes V sin. Re 11— III in situ from the left side X 122- c. Pes V sin. Re II — III in 

 ant. view >, 240. d. Pes V dext. in exterior view X 122. 



the thorax are regularly ronnded. The head and the fourth somites are almost completely fused 

 with the following ones. The anterior division is 2'4 as long as the nrosonie; the ctnnparativc length 

 of the abdominal .somites are seen in the fig. 78 a. The serrated seam along the hinder margins is 

 poorly developed. 



The a)ite>iniilaf extend distinctly beyond the end of the thorax to the end of the second ab- 

 dominal somite. Segments 8 c^^ g are only in front indistinctly separated from segments 10 — 12, which 

 are completely fused; these segments are fairly well separated from segment 13, which is well 

 separated from segment 14; the following segments are well separated from each other. A complete 

 "trithek" is found in segments 3 — 9; "^^sthetasken" are found in segments 10 — ^19, but are wanting in 

 segments 20—24. Small proximal setae are seen in segments 12, 14, 16 and iS. 



The exopodite of the ui/frititac is 1-5 as long as the endopodite, whicli has 6 setae in the 

 outer and 8 in the inner lobe of the second segment. The manducator\' ])art of the iiiandibulac is 

 soft-skinned and \ery long and slender, with delicate l)nt distinct teeth; the third basipodite is widened 



