7o 



COPEPODA 



1902? Spinocalanns Schaudinni 11. sp. Mrazek, pp. 509 — 512, 



taf. IV, taf. V fig. 1. 

 1903. lougicornis G. O. Sars. G. O. Sars, pp. 22 — 



23, pi. XII. 



1903. Spinocalanus abyssalis Giesbr. G. O. Sars, pp. 157 — 158; 



supplement pi. Ill fig. 2. 

 1908. — — v. Bremen, pp. 28— 29, fig. 27. 



1908. — Farran, p. 27. 



Description, i%. Size: varied from 173 to r86 mm. Sars' specimens measured ri— 1"6 and 

 Giesbrecht's ri — 1-25111111. 



The specimens which I have examined are certainly to be referred to Gbt's species in spite 

 of minor differences, in which I most often agree with Sars' description. The head and the first 

 thoracic segment are completely fused except in a single specimen, in which there was indication of 

 a subdivision. The fifth thoracic somite is, as seen in text-fig. 15 a, only indistinctly marked out in front. 

 The ventral protuberance of the genital somite is less prominent than figured by Giesbrecht, and 

 more prominent than drawn by Sars, and the shape is somewhat different. 



a d 



b c e 



Text-fig. 15. Spinocalanus abyssalis Giesbr. 



a. f9. Abdomen X 170. d. yd 1 (stage V). Abdomen X 170. 



b. i<$. Lateral thoracic corner X 170- e. ycf (stage V). Pes V X c. 225. 



c. f <j\ Pes V in anterior view X 225. 



The oral appendages are scarcely different from Giesbrecht's description. In the structure 

 of the natatory legs a few differences are observed. The number of bristles which are present on the 

 anterior surface of the second basipodite are fewer in number than figured by Giesbrecht. The exte- 

 rior seta of the first outer segment of the first pair of legs is distinctly more slender than that of the 

 following segments. The number and the arrangement of the spines or setae which adorn the surface 

 of the exopodites and endopodites in the last three pair of legs show variations from specimen to 

 specimen, and are not quite like Giesbrecht's description; in most specimens f. inst. short spines 

 are observed, as figured by Sars (PI. XII), not only on the posterior, but also on the anterior surface 

 of the two last segments of the endopodites. In the second pair of legs the usual glandular pores were 

 observed at the base of the exterior seta in the two last segments; none was observed in the basal 

 segment. 



The labrum proper is less prominent than figured by Sars (PI. Ill 2c). In front of the hinder 

 margin in the middle a transverse row of long bristles is observed, but here none along the margin 



