COPEPODA 



53 



Remarks. Most probably the specimens examined onght to be referred to Euc. attenuatus Dana 

 in spite of a more produced forehead than in original specimens, and of greater size (Giesbrecht f$: 

 4-2 — 4 - 85 mm.). The Thor Expedition has taken the species at the following two stations 



»/ 7 1904 St. 183 6i°30 E. N. i7°o8 L. W. Yt. 1800 M. Wire iy?; iy^. 

 8 / 6 1905 St. 72 57°52 E. N. 9 °53 L. W. Yt. 1500 M. Wire 1 y $. 



Eucalamis attemiatus has been recorded from the Pacific, the Mediterranean, the Indian Ocean 

 and the Atlantic. In the North Atlantic on the west coast of Ireland it has been found as far north 

 as 54°57 Eat. N. io°5i E. W. at about 700 fathoms. 



Eucalanus crassus Giesbrecht. 

 (PI. I fig. 7; textfig. 11). 



1888. 



Eucalanus crassus 



n, sp. 



Giesbrecht, p. 333. 



I9°5- 



1892. 



— — 



Giesbr. Giesbrecht, p. 132, pis 4. 11, 35. 



1905. 



1898. 



— — 



— 



Giesbrecht & Schmeil, p. 22. 



1905. 



1901. 



— — 



— 



Cleve, p. 6. 



1905. 



1902. 



— — 



— 



Wolfenden, p. 361. 



1906. 



1903. 



— — 



— 



J. C. Thompson and A. Scott, 



p. 242. 



1908. 

 1908. 



1903. 



— — 



— 



Cleve, p. 362. 



1909. 



1904. 



— — 



— 



Wolfenden, pp. 127 — 128. 



1912. 



1905. 



— — 



— 



Wolfenden, p. 996. 





Eucalanns crassus Giesbr. Th. Scott, p. 222. 



G. O. Sars, p. 2. 



Esterly, p. 134, fig. 8. 



Farran, p. 30. 



Pearson, p. 7. 



v. Bremen, pp. 16 — 17; fig. 13. 



Farran, p. 22. 



A. Scott, p. 19 — 20. 



Sewell, p. 357. 



Description. f$. Length: 37 — 4-0 mm. The basal fused portion of the rostral filaments is com- 

 paratively longer than figured by Giesbrecht (t. 35, fig. 26). The last thoracic somite, which is well 

 marked out, is somewhat rounded (text-fig. 11). The abdomen consists of 3 somites only; the receptaculum 

 seminis is large. The coecal sacs on each side are divided into smaller parts (fig. 7). In the 

 structure of the appendages a feature of interest was observed in the structure of the 

 external process of the basal segment of Ri, pes I, which is produced into a distinct 

 point not seen in Giesbrechts fig. 29 taf. 11. No glandular pore was observed. 



The labrum is, in appearance, like that of Eucal. elongatus, but the distance 

 to the insertion of the antennulae is comparatively shorter, and by a transverse groove 

 divided into an anterior and a posterior better raised part. The oral surface of the 

 labrum is most like that of Euc. attenuatus, but differs somewhat by sharp distinction 



Text-fig. 11. 



between median and lateral groups of marginal bristles. The two first groups of the Eucalanus crassus 

 longitudinal series are partly fused and convex towards the middle. Around the first Giesbr - f 9- Ab - 



1 domen in lateral 



muscular spot a transverse group of granules is seen. The structures of the labium view x 30. 

 are in the main similar to those of the species mentioned. 



Occurrence. The Ingolf Expedition has not taken this species, but it probably belongs to the 

 area, as the Thor Expedition has taken it at 



2 % 1905 48°05 Eat. North 8°29 Eong. West Yt. 300 M. Wire 1 f?. 



3^8 1905 St. 167 57°46 Eat. North 9°55 Eong. West Yt. 1500 M. Wire 3 f?. 



