﻿COPKPODA 



231 



It differs from vScott's species from the Malay Archipelago by the less slender fifth foot 

 without inner spine, and b\- the endopodite of the maxillae, which does not possess 6 strong!)- brusii- 

 shaped setae. 



This species is nearly related to Esterh's A'. siiiiilix\ it differs, according to him, especially by 

 the four segments of the fifth pair of legs (PL XIII fig. 77). As the only examined female (from the 

 Gulf of California), which is 6-5 mm. long, is a young one of the ])ennltimate stage, I think, although 

 the fifth pair of legs is completely like the four-segmented one which I have examined of the same 

 stage (PL VIII fig. 17 f), that a more detailed description is needed of specimens from this region before 

 settling the question. 



74. Onchocalanus hirtipes G. O. Sars. 

 (Text-figs 74 a— i). 



1905. Onchocalanus hirtipes n. sp. G. O. Sars, p. 20. 1 1909. OnchocaUmus hirtipes O. O. Sars. A. Scott, p. 83, pi. 



1908. — — G. O.Sars. Farran, p. 49. ] XXXIV figs 9 17. 



Description. f$. vSize of female from Tlior St. 183 was 5-3 mm.; anterior division 4-0 mm.; uro- 

 some 1-3 mm. Sars' specimens measured 47 mm., Farran's 57 and Scott's 5 mm. 



The bod\- is moderately slender. The head is suddenh', but not very much, raised, and does 

 not possess any crista. The fairly long rostntiii has two only slightK' dis'crgent spines, each ])osse.ssing 

 a long, slender terminal filament. The first as well as the fifth thoracic tergites are well marked in 

 front; the lateral corners are somewhat triangularl\' produced, but rounded (text-fig. 74 a). 



The iihdoii/n/ is one third as long as the anterior division; the genital somite is strongly pro- 

 duced below, and has a short receptaculum; in dorsal view it is seen to be much broader somewhat 

 in front of the middle; in front and in a less degree behind it becomes suddenly narrow. The serrated 

 seam along the hinder margin from the second to fourth somite is well developed. -Short, stiff, scattered 

 hairs are found on each side of the genital somite, and tufts of fairl}- long hairs on the ventral surface 

 of the fifth somite. 



The aiitriiiiular reach about to the end of the genital somite; the appendages are .scarcely 

 different from those of C. chclifer, exce])t the Sp. of the segment 24, which is one third removed from the 

 tip of the segment, and extends to the end of segment 25. The .segment 13 is r6 as long as segment 

 12, and the segment 24 is a little longer than 23. 



The exopodite and the endopodite of the luitciiiiae are of almost ecjual length ; the Si of the 

 first basipodite is as in the preceding species short. The nuntdibiilar and vinxillnlae are like those of 

 C.chclifcr, but for the presence of 11 setae in the endoirodite (5 in the Ri III) of the maxillulae. The 

 structure of the maxillae is like that of the two preceding species; the endopodite ha.s, in addition to 

 a single vermiform seta, 7 rather curiously developed 'brush-shaped" setae, similar to tho.se figured in 

 Scott's fig. 14 (PL XXXIV). The mnxilliprds are similar to those of the preceding .species; the com- 

 parative length of its main divisions is 65, 80 and 47; the sen.sory setae of the second basipodite is 

 distinctly brush-sliaped, and .scarcely twice as long as wide on the left side, Init on the right side it 

 is like that of other species; the numl)er of curved setae in the endopodite is as in the preceding 

 species, luit the\- are com])arali\el\- weaker. 



