﻿COPEPODA ,,. 



Vg 1905 St. 167 57^46 L. N. 9°55 L. \\. Vt. 1500 M. Wire 81 f^, i y? (\'), i y? (lY). 

 % 1905 St. 72 57"52 L. N. 9\53 L. W. Vt. 1500 M. Wire 58 f ?, 3 y? ( V), 25 yd" (V), i vc? (IV). 

 ^°/6 1905 St. 88 48°09 L. N. 8^30 L. VV. Vt. 3()o M. Wire 18 f?, 2 >•? (\'), 5 yd' (V). 



Distribution. Thi.s specie.s 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 Ester ly (191 2 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 11 50 fathom.s, and in 

 fifteen out of thirt\'-four gatherings". 



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

 as identical with Giesbrech t'.s, Scott's and Wolfenden'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). 



i'''93- tfiiec. V Scolecithrix securifroiis n. sp Th. Scott, pp.47— 1905. "ec. Scolecithrix persecans Giesbr. Ksterlv, pp. 16S — 167, 



4S, pi. IV. fig. 28. 



1895. uec. — persecans u. sp. Giesbrecht, pp. 253 1 1906. ?pars. Scottocalanus securifrons ScotL Pearson, p. 19. 



254, Taf. 3 figs 6—12. 1908. persecans Giesbr. FaiTan. p. 58. 



i8g8. nee. — — (Mesbr. Giesbrecht &Schmeil, 190S. nee. Scolecithrix persecans Giesbr. v. Bremen, pp. 80— Si. 



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



1903? — _ _ J. C. Thompson, p. 20. 1 106, pi. XXVII figs io-i,S. 



■ 904? -- — — Cleve. p. 197. 191 1, pars Lophothrix securifrons Scott. Wolfeiulen, p. 268. 

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



Description, i'^. Size of female from Thor .St. 82 was 4-69 mm.: anterior di\-ision 3-91 mm.; 

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



The rostrum is very strong, and only terminalh- 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 somewluit 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 ])roject be>ond the following somite. Xo 

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



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

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

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

 extends beyond the end of se.gment 25; the se.gments 8^9 luue two soft setae (text-fig. 68 e). The 

 measurements are ver\- much like those oi L. frontalis. The exopodite of the antii/nar 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 iiiaiidibiilai- are in the main like tliosc of [..frontalis^ but the tliird basipoditc has onh' two setae; 



