﻿COPEPOUA 



53 



Remarks. Most probably the specimens examined ought to l)e referred to Euc. attcnuatus Dana 

 in spite of a more produced forehead tlian in original specimens, and of greater size (Giesbrech t f?: 

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



■V7 1904 St. 183 61^30 L. N. 17^08 L. W. Vt. 1800 M. Wire i y?; i y^. 

 % 1905 vSt. 72 57"52 L. N. 9^53 L. W. Yt. 1500 M. Wire i y $. 



Eucalaims attciniafiis has been recorded from the I'acific, 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 Lat. X. 10^51 L. W. at about 700 fathoms. 



8. Eucalanus crassus riicsbrecht. 

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



Kucalanns cra.ssus Giesbr. Th. Scott, p. 222. 

 — — — G. O- Sars, p. 2. 



Ksterly, p. 134, fig. 8. 



Farran, p. 30. 



Pearson, p. 7. 



V. Bremen, pp. 16 — 17; f'S- 13- 



Farran, p. 22. 



A. Scott, p. 19—20. 



Sewell, p. 357. 



Description, l'^. 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 onI\-; 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 Giesbr echts fig. 29 taf. 11. No glandular pore was observed. 



The labniin is, in appearance, like that of Eiical. clo)igatiis^ 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 Eiic. attcnuatus^ but differs somewhat bv sharp distinction 



Text-fig. II. 

 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 '"^sir.^ y. A - 



^ ^ donien in lateral 



muscular spot a transverse group of granules is seen. The structures of tlie 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 Lat. North 8^29 Long. West Vt. 300 M. Wire i f?. 



31/8 1905 vSt. 167 57^46 Lat. North 9"55 Long. West Vt. 1500 M. Wire 3 f^. 



