242 



COPEPODA 



1905. Phaenna spinifera Claus. G. O. Sars, p. 5. 



1905. — — Farran, p. 47. 



1906. — Pearson, p. 21. 

 1908. — Farran, p. 47. 



1998. — — v. Bremen, p. 56 fig. 63. 



1909. Phaenna spinifera Clans. Pesta, p. 22. 



1909. 

 1911. 

 1912. 



— A. Scott, p. 80. 



— Wolfenden, pp. 285 — 286. 



— Pesta, p. 24. 



anterior division 2*42; uro- 



Description. f£. Size of specimen from Thor St. 82 was 2*9 mm. 

 some 0-48 mm. Giesbrecht's specimens measured r8— 2 - i mm. 



In some of the examined specimens the head possesses dorsally, as seen in text-fig. 79, a conical 

 protuberance. 



The interior lobes of the maxillae are placed very near to each other, the Lob. 1 has 5 setae, 

 the Lob. 2 has 3, and the Lob. 3, which is very short, has probably 3 setae as well; the fourth lobe 

 has at least 2 setae, of which the one is comparatively strong, and distinctly curved, and the fifth 

 lobe has in addition to fairly strong claw-shaped setae two short slender ones; the endopodite has seven 

 comparatively short and thick brush-shaped setae, distally apparently fused, in addition to a long and 

 slender pointed one. 



The legs are scarcely different from Giesbrecht's description. The outer margin of the third 

 outer segment of the first foot has proximally to the middle a small incision and a glandular pore. On 

 the anterior surface of the third inner segment of the second and third pairs of legs a 

 minute glandular pore was found, but in the fourth pair none was seen. At the base 

 of the outer spine in the Re II, and at the base of Se I and III Re III, glandular 

 pores were found in the second pair of legs, and in the third and fourth pairs at the 

 base of Se Re I as well. The Ri II oi III, which are fused in the second pair of legs, 

 possess on the posterior surface two coronas of 8 and 6 long spines respectively, the 

 Ri II and III of the third pair of legs have 8 and 6 spines respectively, and the Ri II 

 of the fourth pair of legs has 6 long rather weak spines. 



The very short labrum and the elevation in front of it are only indistinctly 

 separated, and the latter is placed just behind the insertion of the antennulae; the epi- 

 stoma is covered by a number of longer and shorter setae; 011 the labrum proper a trans- 

 verse group of fairly short setae is found; the marginal setae are only poorly developed (PI. VII fig. 1 a). 

 The oral surface (fig. 1 b) has in front 4 longer and shorter oblique groups of shorter hairs converging 

 towards the middle, and more posteriorly, probably composed of the three hinder, a longitudinally placed 

 elongated group of short hairs is found. In the middle at least three groups of very short hairs or 

 granules are found. The lamina labialis is only poorly developed (PI. VII fig. 1 c); in front of it a 

 regular granular area is found; the area behind the lamina and on the labial lobes was not studied 

 in details (cf. fig. 1 c). 



fo*. Size of specimen from St. 82 was 2*26 mm.; anterior division 1-89111111.; urosome 037 mm. 

 Giesbrecht's specimen measured i-8 mm. 



The anterior division did not possess a lamelliform projection, as figured and described by Gies- 

 brecht. No dorsal protuberance was found. 



Y^ (St. V). Size of specimen from Thor St. 82 was 23 mm. 



The only difference was found in the different structure of the abdomen. 



Text-fig. 79. 

 Phaenna spini- 

 fera Claus. 

 f9- Lateral out 

 line of body 

 X 18. 



