﻿COPEPODA 211 



but only in small mimbers. In spite of small differences I do not doubt that my specimens ought to 

 be referred to Farran's .S'. ovata. As the maxillae do not possess any amalliform setae, I have referred 

 the species to ScoleciihriccUa, though in several respects it shows great similarit\- to Scaplwcalanus 

 obfnsifrons, and perhaps is more related to this species than to .Vr. iiiiiior. 



68. Lophothrix frontalis (iicsbr. 

 (PI. VII figs ja— d; text-figs 66 a— f and 67 a— di. 



1895. Lophothrix frontaHs n. sp. Giesbrecht, p 254, pi. II. 1906. Scolecithri.\ frontahs Giesbr. Esterly, p. 65 pis 9&13. 



1898. Scolecithrix froiitah.s (jie.sbr. Giesbrecht & Schnieil, p. 49- 1908. Lophothrix frontalis Giesbr. Farran, p. 58. 



1903- — — — J. C. Thompson, p. 21. 1908. Scolecithrix frontalis Giesbr. v.Breinen, pp. 79-80, fig.93. 



1904 Lophothrix frontalis Giesbr. Wolfenden , p. 120 pi. IX 1909. Lo])hothri\- frontalis Giesbr .\. Scott, p. 99, pL XXVI figs 



figs 41—42- 11-20, pi. XXIX figs 1- 10. 



1905. — — — G. O. Sars, p. 6. I 1911. — — _ Wolfenden. p. 268. 



1906. — — — Pearson, p. 19. ! 



Description, f?. Size of female from Thor St. 72 was 6-45 mm.; anterior division 5-18 mm.; 

 urosome 1-27 mm. (Tiesbrech t's specimen measured 66 mm., Scott's 7-4, and Wolfenden's 5-5— 6-o mm. 



The genital somite is slightly produced below and has an elongate receptaculnm .'^eminis, which 

 is directed upwards and forwards (text-fig. 66 a). Along the hinder margin of somites 2— 4 a well devel- 

 oped serration is found; the third and the fourth somites possess dorsally and anteriorly transverse 

 groujis of short spines. 



The antennulai\ which extend beyond the end of the third abdominal .somite, consist of 24 seg- 

 ments, as segments 24 and 25 are fairly well separated. ".Esthetasken" are, in contrast to Scott's figure, 

 beyond segments 8^9 only found in segments 12, 14, 19 and 25. The segment 10 possesses a well 

 developed seta, and a proximal seta is beyond segment 8^9 only found in segments 12, 14 and 18. 

 The Sp of segment 24 extends distinctly beyond the end of segment 25. Segments 8'^g are only a 

 little shorter than segment 18, which is a little longer than segment 17 as well as 19, which is 1-2 as 

 long as segment 20. The aiitciitiac are like Giesbrecht's figure, with the exopodite a little longer 

 than the endopodite, which has 8 setae in the Li and 6 in the Le. The third basipodite of the iikiii- 

 dihulac has three long convex setae; the first inner segment has 2 setae, and the second has 9. The 

 maxillnlnc are like those of S. iiiagiius^ with 7 — 2 setae in L,e, 14 setae in Li I, 2 in Li II, 5 in Li III 

 and 4 or 5 in basipod. III. The Ri I has 3 setae, the Ri II ^ III 5 setae, and the Re has 9 setae. 

 The shape of the maxillae is like that of fig. 14 a; amalliform as well as vermiform setae are found. 

 The inaxillipeds are like Giesbrecht's description. The second, third and fourth pairs of legs do not 

 show the marked difference in the second basipodite when observed in lateral view in situ; in the 

 second and third feet an outer-edge lamina is found, but neither spines nor distal tooth. The first outer 

 segment of i\\t firsl /oof has no outer seta. The second foot has a well developed long outer spine in 

 the first inner segment, as figured by Giesbrecht; the anterior surface is smooth, but the posterior 

 surface has a number of short spines, as seen in fig. 7 a PI. \\\. The fo 1/1/ li pair of legs has the inner 

 margin of the second basipodite smooth; the third basipodite has, like the third pair, a small inner 

 tooth on the anterior surface near the end; a few tcelli were found only on the posterior surface of the 

 two inner segments. Tlie ////// pair of legs is .scarcely different from Giesbrecht's description. 



2f 



