Remarks 



Wolt'enden (1906). who also first described the 

 closely related ^'. ma^rtus. differentiated between that 

 species and ^\ antarcticus because of the different 

 body types. This is easily seen when the two species 

 are side-by-side, as they were in Wolfenden's Antarc- 

 tic collections. However, this difference in form is not 

 so easily defined. Wolfenden's figures indicate only a 

 slight prolongation of Th5: actually it is as prolonged 

 as on N. magnus. His lateral figure (1911) indicates 

 some hesitancy in this regard since it is clearly 

 altered. The unusual male, described by Wolfenden 

 (1906), probably led several workers (e.g., Vervoort, 

 1957) to discount, at least in part, the validity of S. 

 antarcticus. Wolfenden's description of the male 

 agrees with that given above, except in one feature: 

 Wolfenden stated, and illustrated, that right P5 was 

 longest; this could be an error, since left P5, when the 

 male is viewed dorsally, actually curves out to the 

 right of the specimen, while the shorter right leg is 

 obscured. No males from the Antarctic were found for 

 comparison during the present study. 



Brodsky (1950) described two body types of S. 

 magnus, which he suggested might be subspecies. 

 Only his Arctic specimens were S. antarcticus, while 

 those from the North Pacific were -S. magnus. His 

 figure of P3 appears to be a composite of P3 and P4. 



The description and illustrations by Bradford 

 (1971) are consistent with those of S. antarcticus. 

 Bradford's specimens (sample 9, Table 3) were found 

 also to agree in all respects with the description of S'. 

 antarcticus. 



Distribution 



There are several records of S. magnus from high 

 latitudes that may be of 5. antarcticus (see also S. 

 magnus): especially the Arctic records of Grice (1962) 

 in the Eurasian Basin (110 m); Grainger (1965) in the 

 Canadian Basin (0-500 m); and Dunbar and Harding 

 (1968) in the Canadian Basin (0-2,000 m). 



Several records of S. magnus are interpreted or con- 

 firmed as S. antarcticus. Some of Farran's (1929) 

 specimens from the Antarctic (sample 7, Table 3) 



were found to be 6'. antarcticus. Brodsky and 

 Nikitin's (1955) records of S. magnus from the Arctic 

 Canadian Basin are accepted as S. antarcticus. John- 

 son (1963a) and Minoda (1967) both indirectly in- 

 dicated the presence of male S. antarcticus, so that 

 their records of S\ magnus are also interpreted as S. 

 antarcticus. 



The distribution of S'. antarcticus is summarized 

 below: 



Arctic Ocean 



Central: Brodsky (1950), 0-400 m or more. 

 Eurasian Basin: Minoda (1967), 0-850 m. 

 Canadian Basin: Brodsky and Nikitin (1955), 



0-below 1,000 m. —Johnson (1963a), 0- 



2,000 m. — Vidal (1971). —Present study, 



140-2,500 m. 

 Antarctic 



Pacific Sector: Farran (1929), 0-1,750 m. — 



Bradford (1971), 0-1,000 m. 

 Indian Sector: Wolfenden (1906, 1911), 1,200 m. 



Although there have been no records of S. antarc- 

 ticus outside of the Arctic and Antarctic, the possibili- 

 ty of a continuous distribution should not be over- 

 looked. Perhaps S. antarcticus inhabits greater 

 depths in midlatitudes, or perhaps it has not been 

 recognized in midlatitude collections. A specimen of 

 Spinocalanus sp. Johnson was reported by Wheeler 

 (1970) from the northwest Atlantic, but this is 

 probably a male of S. angusticeps. 



(6. Spinocalanus major Esterly, 1906) 



See Spinocalanus brevicaudatus Brodsky, 1950. 



(7. Spinocalanus latifrons Sars, 1907) 



See Spinocalanus magnus Wolfenden, 1904. 



Spinocalanua antarcticus, male 



Figure 57. — Habitus, dorsal view; scale A. 



Figure 58. — Habitus, lateral view; scale A. 



Figure 59. — Al; §cale C. 



Figure 60.— Mn blade; scale F. 



Figure 61.— Mxl gnathobase; scale F. 



Figure 62.— Mxp; scale C. 



Figure 63.— PI; scale C. 



Figure 64. — P2; scale C. 



Figure 65.— P3; scale C. 



Figure 66.— P4; scale C. 



Figure 67.— P5; scale C. 



Figure 68.— Stage V, P5; scale D. 



8. Spinocalanus hirtus Sars, 1907 



Spinocalanus hirtus Sars, 1907, p. 5-6. — Sars, 1925, 



p. 32-33. 

 Spinocalanus hirtipes. — Sars, 1924, lapsus calami, 



pi. 9, fig. 1-7. 



Type Specimen: Holotype, female, on Slide F5039, 



OSLO. 



Type LOCALITY; East Atlantic, 0-5,000 m. 



Description 



PI Ri with 2 inner setae; P2 Ri2 with 1 outer seta. 



35 



