COPEPODA 71 



proper; laterally a series of short setae is observed (PI. I fig. 10 a), and in front of these, partly on the 

 oral snrface, a gronp of short spines or grannies is observed. Orally we find on each side an inner and 

 an onter series of delicate bristles, arranged in a short posterior and a long anterior division. As far 

 as the strnctnre of the labinni etc. is concerned I refer to the fig. 10 b. 



fc?. Size of male 1-63 mm. 



Tlie thoracic somite IV and V are as seen in the text-fig. 15 b well separated. Tht antennulae 

 have the articnlar-membranes between the segments Stvg and 10, 10 and 11, 11 and 12 rather in- 

 distinct; the antennnlae become rather snddenly narrower beyond segment 14, which is wider than 

 15. The first to ninth segments possess two bristles in addition to one or two "Aesthetasken"; in the 

 following segments, except in the 12th, no distinct proximal seta (Spr.) is observed, bnt small incisions, 

 corresponding to their insertions; "Aesthetasken" are observed in several of the segments. The oral 

 appendages are as shown and partly figured by Sars rather rudimentary. The viaxillulae show the 

 following features. The Le possesses 7 short bristles; the Li I has only a few rudimentary setae, and 

 the rather prominent L,i II — III have 3 short delicate bristles each. The Basp. has 5 and the Ri I — III 

 4 -j- 4 -f 6 bristles, of which those of Ri III are fairly long and slender. The Rehears 11 partly power- 

 ful hairs. The viandiblcs are figured by Sars; the anfennac^ the viaxillae and the maxillipeds are 

 less powerful, bnt in the main features alike those of the female. The lahnuii and labial appendages 

 show exteriorly a structure scarcely different from that of the female. 



The Se of Re I pes I is even less developed than in the female. The structure of the fifth 

 pair of legs (cf. text-fig. 15 c) is in some points different from Sars' description; between the Re I and 

 II on the right side an indistinct limitation is seen. 



Y (St. V). Size: 1-45 mm.; anterior division i-oo and the abdomen 0-45 mm. 



The shape of the body is scarcely different from that of the female; there is indication of 

 articulation between the head and first thoracic somite; the two last thoracic somites are, as seen in 

 text-fig. 15 d, well developed. The oral and natatory appendages are scarcely different from those of 

 the females. The structure of pes V is shown in text-fig. 14 e. 



Occurrence. The Ingolf Expedition has taken 2 mature females, a single mature male and 

 two young ones (St. V) 2% 1895 2 p. m. V. 200-0 fathoms St. 25 63030 Lat. N. 54°25 Long. W. 



Distribution. This species has been taken at 2 different stations in the polar seas in about the 

 80th degree of latitude and the 134th degree of longitude east as well as at 8i°32 L. N. by Romer 

 and Schaudinn, on the coast of Norway (Osterfjord Norway in the depth from 400 -boo metres), 

 and in moderate numbers on the west coast of Ireland "at all depths from 200 to 1000 fathoms". Ac- 

 cording to Giesbrecht it is found "99°— 132° W. 3° S.— 14° N. In 1000—4000 Meter Tiefe". 



Remarks. The female described by Mrazek as Spinocalanus Schmidinni \s certainly identical 

 with the mentioned Species. His male, however, seems in rather important features to differ; in his spec- 

 imen the segments VIII to XIV of the antennnlae are completely fused (Taf. V fig. i), and the pes V 

 differs distinctly, especially by the Ri, the terminal seta of which just reaches beyond the end of Re I. 



