COPEPODA 



215 



'/ 9 1905 St. 167 57046 L. N. 9 55 L. W. Yt. 1500 M. Wire 81 f ?, i y? (V), i y? (IV). 

 % 1905 St. 72 57^52 L. N. 9 53 U W. Yt. 1500 M. Wire 58 f ?, 3 y? (V), 25 y o* (V), i y<? (IV). 

 2 % 1905 St. 88 48^9 L. N. 83O L. W. Yt. 300 M. Wire 18 f?, 2 y? (V), 5 y<$ (V). 



Distribution. This species is probably distributed all over the Atlantic as far north as Den- 

 mark Strait and as far south as 35 L. S. It has been recorded from the Pacific (35 L. N. 125 

 L. W.), from the Gulf of California where, according to Esterly (1912 p. 321), it is found between 50 

 and 300 fathoms, and from the Malay Archipelago. According to Far ran it is a not uncommon species 

 in the N. E. Atlantic. "It was taken on every station at all depths from 330 to 1150 fathoms, and in 

 fifteen out of thirty-four gatherings". 



Remarks. In spite of a few minor differences, partly enumerated above, I regard this species 

 as identical with Giesbrech t's, Scott's and Wolf end en's species. 



69. Scottocalanus Thorii n. sp. 



(PI. VI figs 14 a c, PI. VIII figs 14 a b, text-figs 68 a i, 69 a d and 70 a d). 

 1893. cfnec. 9 Scolecithrix securifrons n.sp. Th. Scott, pp.47 I 1905. nee. Scolecithrix persecans Giesbr. Esterly, pp. 168167, 



48, pi. IV. 

 1895. nee. persecans n. sp. Giesbrecht, pp. 253 



fig. 28. 

 1906. ? pars. Scottocalanus securifrons Scott Pearson, p. 19. 



254, Taf. 3 figs 6-12. j 1908. persecans Giesbr. Farran, p. 58. 



1898. nee. Giesbr. Giesbrecht &Schmeil, 1908. nee. Scolecithrix persecans Giesbr. v. Bremen, pp. 80 81. 



p. 58. 1909. nee. Scottocalanus persecans Giesbr. A. Scott, pp. 105 



1903? J. C. Thompson, p. 20. i 106, pi. XXVII figs 10 18. 



1904? Cleve, p. 197. 1911. pars. Lophothrix securifrons Scott. Wolfenden, p. 268. 



1905. Scottocalanus securifrons Soott G. O. Sars, p. 7. 



Description. f$. Size of female from Thor St. 82 was 4-69 mm.; anterior division 3-91 mm.; 

 urosome 078 mm. Esterly's specimens measured 4-6 mm. 



The rostrum is very strong, and only terminally subdivided into two rather short divergent 

 branches without terminal appendages (text-figs 68 a b). The eyes are well developed. The forehead 

 is surmounted by a short, rather prominent crest. The shape of body is, as seen in text-figs 68 c d, 

 somewhat robust, and the anterior division is almost five times as long as the abdomen. The first as 

 well as the fifth somites are fused with the preceding ones; the lateral corners are somewhat triangularly 

 produced, but are obtusely rounded, with a small notch. 



The genital somite, which is about as long as the following three somites, is moderately pro- 

 duced below, but the hinder and ventral corner does not project beyond the following somite. No 

 serration was observed along the hinder margin of the abdominal somites. 



The antennulae extend at least to the end of the third abdominal somite; segments 8^9 are 

 well separated from 10, and segments 24 and 25 are fairly well separated. The appendages differ from 

 those of L.frontalis by wanting a seta in segment 10, and by the delicate Sp. of segment 24, which just 

 extends beyond the end of segment 25; the segments 8^9 have two soft setae (text-fig. 68 e). The 

 measurements are very much like those of L.frontalis. The exopodite of the antennae is almost 1-5 as 

 long as the endopodite, which has 8 setae in the outer and 6 in the inner lobe of the second segment. 

 The mandibnlac are in the main like those of L.frontalis, but the third basipodite has only two setae; 



