West Greenland (Jespersen, 1934), 500-1,500 m; and 

 the Norwegian Sea (0stvedt, 1955), 600-2,000 m, 

 could be either or both species. 



The investigation of S. magnus in the Antarctic has 

 likewise been hampered by the co-occurrence of the 

 two closely related species. The material of Hardy and 

 Gunther (1935) and Vervoort (1951, 1957, 1965) 

 should be reexamined. 



Wilson (1942) combined S. magnus from two 

 samples (sample 41, Table 3); the composite did con- 

 tain S. magnus and both stations are considered valid 

 records. The other three samples reported by Wilson 

 to contain S. magnus were not located but were 

 collected at intermediate positions. Wilson (1950) 

 reported S. magnus from the China Sea, but the sam- 

 ple so labeled did not contain any Spinocalanidae and 

 the record is considered invalid. 



Some of Farran's specimens of S. magnus are in the 

 collection of the National Museum of Ireland, Dublin 

 (O'Riordan, 1969). The holotype of S. latifrons Sars is 

 on slides F5041-F5043, OSLO. 



5. Spinocalanus antarcticus 

 Wolfenden, 1906 



(Figures 43-68, 151, 152) 



Spinocalanus antarcticus Wolfenden, 1906, p. 43, pi. 

 14, fig. 6-9. —Wolfenden, 1911, p. 217-218, fig. 9. 



Spinocalanus magnus. — Brodsky, 1950 (part), p. 

 123-124, fig. 43; not "female T". —Bradford, 1971, 

 p. 18, fig. 28-29. — Vidal, 1971, p. 18, 23, fig. 34-35, 

 38, 40-41. Not S. magnus Wolfenden, 1904. 



Spinocalanus? sp. Johnson, 1963a, p. 91-94, fig. 2. 



Type SPECIMEN: Unknown. 



Type Locality: Antarctic, Indian Ocean Sector, 



1,200 m. 



Material Studied: 7 females (2.38-2.56 mm, mean 



= 2.46 mm), sample 7 (Table 3); 7 females (2.55-2.62 



mm, mean = 2.58 mm), sample 9; 9 females (2.52-2.83 



mm, mean = 2.66 mm), 1 male (1.80 mm), and 2 male 



Spinocalanus antarcticus, female 



Figure 43. — Genital segment, ventral view; scale C. 

 Figure 44.— A2; scale C. 



43 



stage V (1.75, 1.90 mm), sample A2 (Table 1); 9 

 females (2.5-2.75 mm, mean = 2.64 mm), 5 female 

 stage V (1.9-2.1 mm, mean = 2.04 mm), and 3 male 

 stage V (1.7, 1.8, 1.8 mm), sample A4; 2 females (2.60, 

 2.68 mm) and 3 males (1.83, 1.84, 1.90 mm), sample 

 A5; 6 females (2.50-2.80 mm, mean = 2.59 mm), 3 

 female stage V (2.0, 2.15, 2.25 mm), and 1 male (1.70 

 mm), sample A6; 2 males (1.98, 2.05 mm), sample 

 A23; 2 males (2.00, 2.32 mm), sample A27; 6 females 

 (2.60-2.76 mm, mean = 2.67 mm), sample A33; 2 

 females (2.60, 2.65 mm) and 5 males (1.92-2.09 mm, 

 mean = 1.99 mm), sample A34; 1 male (2.00 mm), 

 sample A36; 7 females (2.76-3.00 mm, mean = 2.84 

 mm) and 1 male (2.08 mm), sample A48; 2 females 

 (2.75, 2.82 mm), sample A50; 1 male (1.92 mm), sam- 

 ple A51. 



Description 



PI Ri with 3 inner setae; P2 Ri2 with 1 outer seta. 



Female.— Length 2.25-3.00 mm (Figs. 45, 46). 

 Prosome in dorsal view robust ovoid, in lateral view 

 with abrupt, even forward slope. Th4 and Th5 

 separate; Th5 lateral corners prolonged, variable, 

 reaching about midgenital segment. Thl-Th4 without 

 lateral spinules. Prosome length 4 '4 times urosome. 

 Area of attachment proximal to genital segment with 

 dorsal spinules. Genital segment slightly wider than 

 long, protruding ventrally one-third depth of rest of 

 urosome; genital segment relatively opaque, masking 

 internal structure; genital field (Fig. 43) apparently 

 similar in all Spinocalanus species. Supra-anal plate 

 with row of spinules. Caudal rami about as long as 

 wide, left ramus longer and wider than right. Caudal 

 setae also asymmetrical: left terminal seta second 



30 



