54 



COPEPODA 



Distribution. This species has been recorded from the Mediterranean, the Indian Ocean, the 

 Pacific and the Atlantic. It has been found several times in the Fseroe channel and on the west 

 coast of Ireland as far north as 56°!! L,. N. 9°50 L. W. 



Paracalanidae. 



9. Paracalanus parvus Claus. 

 (Text-figures 12 a — f). 



1863. Calanus parvus n. sp. Clans, p. 173. 



1864. Paracalanus parvus Claus. Boeck, p. 233. 



1892. 

 1892. 



1894? 



1898. 



1898. - 



1899. 



1899. 



1900. — 

 1900, 



1901. — 

 1 901. 



1901. — 

 1902. 

 1902. 

 1902. 



1903. 



Canu, p. 169, pi. I, figs. 1 — 12. 

 Giesbrecht, pp. 164 — 171, taf. 



1, 6 and 9. 

 Th. vScott, pp. 26—27, pl- I 



figs. 9-14. 

 Aurivillius, pp. 29 — 30. 

 Giesbrecht & Schmeil, p. 24. 

 Th. Scott, p. 248. 

 Brad}', p. 32. 

 Th. Scott, p. 383. 

 Wheeler, p. 168, figs 6 a — c. 

 Th. Scott, p. 350. 

 Cleve, p. 8. 

 Brady, p. 32. 

 A. Scott, p. 402. 

 Wolfenden, p. 361. 

 G. O. Sars, pp. 17—18 pis VIII 



—IX. 

 Jensen, Johansen and Levin- 

 sen, p. 303, tabel I. 



1903. Paracalanus parvus Claus. J.C.Thoinpson&A. Scott, p.243. 



1903. — Cleve, p. 367. 



1904. — — Cleve, p. 194. 



1904. — Wolfenden, pp. 129—130. 



1905. — — — var. borealis n. var. Wolfenden, 



pp. 997— 998, pi. 96 figs 7 — 11 and 16. 



1905. — parvus Claus. G. O. Sars, p. 2. 



— — Farran, p. 30. 



— — Esterly,pp. 140— 4i,figsi2a — e. 



1906. — — var. perplexus 11. var. Norman 



& A. Scott, p. 127 pi. XII figs. 1—2. 

 1906. — parvus Claus. Pearson, p. 8. 



1906. — — T. Scott, p. 298. 



1908. — — v.Bremen, p. 20 fig. 17. 



1908. — — Farran, p. 22. 



1909. — — A. Scott, pp. 27 — 28. 



1910. — — Farran, pp. 61 — 63. 



1 9 10. — Kraeeft, p. 77, taf. 1 figs. 



1— 13- 

 1910. — — Steuer, p. 22. 



1912. — ■ — Sewell, p. 358. 



Description. f<j>. Size: 0-84 — ro mm. 



In contrast to Giesbrecht the head and the first thoracic somite are completely fused. The 

 mouthlimbs are scarcely different from Giesbrecht's description. In the structure of the natatory 

 legs, however, fairly well marked differences are found, especially in the armatures of the basipodites 

 and endopodites; in these respects they fairly well agree with Sars' description, but especially with 

 that given by Wolfenden for his P. parvus variet. borealis. In Sars figure, PI. IX, the first segment 

 of the exopodite of the first pair of legs has a minute spine; in all my specimens this spine is sub- 

 stituted for by a bundle of fine hairs as seen in Giesbrecht's Taf. 9 fig. 31. Glandular pores are ob- 

 served at the base of the exterior spines of the exopodites (at least in the second pair of legs). 



Between the mouth and the rostral filaments the usual elevations are found; I was not able 

 to see any setae along the hinder margin of the labrum. The arrangement of hairs on the oral sur- 

 face of the labrum is similar to that of Pseudo calanus. The first group, which is convex outwards, 

 and oblique, consists of about 10 short hairs in a single row; this group is followed by an almost 

 straight row of about 25 very short hairs; most orally, and fairly well separated from this group, 20 

 hairs are placed in a S-shaped group. Laterally to the first group two partly transverse groups of 



