204 



COPEPODA 



65. Scolecithricella minor Brady. 

 (PI. VII fig. 13; PI. VIII figs 10 a— c; text-figs 65 a— c.) 



1883.? Scolecithrix minor n. sp. Brady, pp. 58—59. P'- ^VI 



figs 15—16, pi. XVIII figs I 5. 

 1S92. ? — — Brady. Giesbrecht, p. 266. 



1894.? - — — Th. Scott, p. 50. 



1898.? — — — Giesbrecht & Schmeil, p. 46. 



1902.? — Roineri 11. sp. Mrazek, pp 513— 515, Taf. 6, 



text-figs II — 13. 

 1903. Scolecithricella minor Brady. G. O. Sars, pp. 55—56, pis 



XXXVn— XXXVIII. 



1904. Scolecithrix minor Brady. Wolfenden, p iir. 



1905. — ^ — Th. Scott, p 223. 



1905. — — — Farran, p. 35. 



1906. Scolecithricella minor Brady. Pearson, p. 18. 



1907. — — - Koefoed & Damas, p. 397. 

 190S. — — - Farran, p. 51. 



1908. Scolecithrix minor Bradv. v. Bremen, pp.73 — 74,text-f. 85. 

 1913. Scolecithricella minor Brady. Stephensen, pp. 314 -315. 



Text-fig. 65. Scolecithnccl/a minor Brady. 



a-b. Yd'— 9 (St V'. Abdomen X 87. 



c. Ycf (St. IV). Abdomen X 57- 



Description, f?. Size of specimen from Ingolf St. 40 was 1-52 mm.; anterior divi.sion 1-22 mm.; 

 urosome 03 mm. Sars's specimens measured 1-40 mm. 



The antennulae extend slightly beyond the end of the thorax; the segments i and 2 are in- 

 distinctly separated, and so are segments 24 and 25; the segments Sf^g are almost completely fused 

 with 10. The Sp of segment 24 is placed terminally, and extends distinctly beyond the end of segment 

 ;, 1, c 25. The month-limbs are completely like Sars' figures, and so are 



the natatory legs; the second basipodite of the fourth pair of legs 

 has 3 — 4 rather stiff, marginal setae. In lateral view the third as 

 well as the fourth foot has in the second basipodite an outer-edge 

 lamina, which terminally is produced into a small tooth, much big- 

 ger in the fourth foot; this lamina has in the third pair, almost in 

 the middle, about 5 rather .short and delicate teeth. 



The labniiii and area in front of it is in lateral view very 

 much like Sars' figure PI. XXXVII; the labrum proper and its an- 

 terior portion, which is only slightly prominent, have onh' a slightly 

 pronounced concavity between them. The anterior surface of the labrum is like that of 6'. ovata (cf. PI. 

 VII fig. 14 b); most anteriorly a transverse row of long slender bristles is found, continued laterally and 

 posteriorly into a row of shorter setae; behind this, almost in the middle, a transverse row of shorter 

 setae is found. 



The oral S7tr/ace of the labrum shows a great similarity to that of 5. ovata (cf. fig. 14 c), but 

 the anterior lateral group is not well separated from the marginal setae, and the following group is 

 not convex outwards, and is directed towards the second median circular spot. The rudimentary lamina 

 labialis (PI. VII fig. 13 a) scarcely shows features of great interest. The arrangement of hairs upon 

 and behind the labial lobes shows great similarity to PI. VII fig. 14 b, but the median and the lateral 

 groups of hairs are fused. 



fc?. Size of specimen from Ingolf St. 40 was 1-34 mm.; anterior division 0-99 mm. ; uro,some 

 0-35 ram. Sars' specimens measured 1-40 mm. 



The antennulae are like Sars' figure, but segments 200^21 bear only a single seta not two. 

 The mouth-appendages are very much like those of the female, except the mandibulae which have 

 the third basipodite distinctly longer than wide, the maxillae which have the sensory setae better 

 developed, and the maxillipeds which are shorter and more clums^•. The natatory legs are scarceh- 

 different from those of the female. The fifth font is like Sars' description; the left endopodite 



