(16. Spinocalanus heterocaudatus 

 Rose, 1937) 



See Spinocalanus magnus Wolfenden, 1904. 



(17. Spinocalanus pad ficus Mori, 1942) 



See Spinocalanus magnus Wolfenden, 1904. 



(18. Spinocalanus stellatus Brodsky, 1950) 



See Spinocalanus horridus Wolfenden, 1911. 



(19. Spinocalanus spinipes Brodsky, 1950) 



Female, see Spinocalanus horridus Wolfenden, 

 1911. Male, see S. magnus Wolfenden, 1904. 



(20. Spinocalanus pseudospinipes 

 Brodsky, 1950) 



See Spinocalanus brevicaudatus Brodsky, 1950. 



21. Spinocalanus similis Brodsky, 1950 



(Figures 86-97, 154) 



Spinocalanus similis Brodsky, 1950, p. 128-129, fig. 



47. 

 Spinocalanus similis var. profundalis Brodsky, 1955 



(part), p. 185-187, fig. Ig; male only. 



Type SPECIMEN: Unknown. 



Type LOCALITY: Northwest Pacific, 1,000-4,000 m. 

 Material Studied: 2 females (1.08, 1.15 mm), sam- 

 ple 30 (Table 3); 4 females (1.03-1.24 mm, mean = 

 1.12 mm) and 2 males (1.53 mm), sample 31. 



Description 



PI Ri with 2 inner setae; P2 Ri2 with no outer seta. 



Female.— Length 1.03-1.5 mm (Figs. 86, 87). 

 Prosome in dorsal view robust ovoid. Head rounded in 

 dorsal view; in lateral view with irregular, gentle 

 forward slope. Th4 and Th5 separate; Th5 lateral cor- 

 ners slightly prolonged; Thl-Th4 without lateral 

 spinules. Prosome length slightly more than 3 times 

 urosome. Genital segment slightly wider than long, 

 protruding ventrally one-half depth of rest of 

 urosome; caudal rami about as long as wide; right 

 ramus sometimes larger than left (Brodsky, 1950). 

 Caudal setae incomplete on specimens examined. 

 Supra-anal plate without fringe of long hairs. 



Al exceeding caudal rami by about 1 segment; ter- 



minal segments (Fig. 154) of moderate length and 

 width. Apparent deviation: I-2s; remainder as Table 

 4. 



A2 Rel with 1 seta. 



Mxl gnathobase with 4 proximal setae thick, about 

 one-half thickness of strong outer setae; probably thin 

 seta distal from cluster of long spinules on 

 midanterior surface; posterior surface with several 

 clusters of long and short spinules and spines. 



Mx2 with outer seta; posterior surface of lobe-5 base 

 with spines. 



Mxp (Fig. 88) with transverse spine-comb on 

 midouter Bl; longitudinal row of stiff, short hairs on 

 midanterior surface; proximal and distal row of den- 

 ticles on posterior surface. B2 with strong transverse 

 spine-comb and longitudinal row of stiff hairs. Ri4-5 

 outer setae nude, bladelike, tapering toward each end; 

 spinules on inner edge of Ri5. 



PI (Fig. 89) Bl with few setules and spinules on dis- 

 tal surface; inner margin nude. B2 anterior and 

 posterior inner surface with hairs and setules. Rel-2 

 anterior surface with outer distal row of spinules; Re3 

 posterior surface with 3-4 spines (present material) or 

 nude (Brodsky, 1950). Re outer spines reaching 

 beyond base of following spines. Ri surface nude. 



P2 (Fig. 90)-P3 (Fig. 91) Bl outer surface with 3 

 rows of spines; inner surface with setules, inner 

 margin with hairs. P4 (Fig. 92) Bl outer anterior sur- 

 face with few short spines; inner surface with few long 

 hairs. P2-P4 B2 nude. 



Re2 posterior surface on P3-P4 with proximal row of 

 12 "wide lamellar spines" (Brodsky, 1950), but ap- 

 parently not as wide as those on S. abyssalis or S. 

 longicornis (Brodsky, fig. 47); distal row of few small 

 spines. 



Re3 posterior surface on P2-P4 with 3 rows of 4-5 

 spines (Brodsky, 1950, for P3-P4). 



P3-P4 Ri3 posterior surface with proximal row of 

 thin spines, distal row of few larger spines. 



Male. — Length 1.4-1.6 mm (Figs. 93, 94). Prosome 

 anterior irregular in dorsal view, posterior somewhat 

 rectangular; in lateral view with gentle forward slope. 

 Ce and Thl separate. Prosome length IVa times 



Spinocalanus similis 



Figure 86.— Female, habitus, dorsal view; sample 30 (Table 3); 



scale B. 

 Figure 87. — Female, habitus, lateral view; sample 30; scale B. 

 Figure 88.— Female, Mxp Bl-2; sample 30; scale D. 

 Figure 89.— Female, PI; sample 30; scale D. 

 Figure 90.— Female, P2; sample 30; scale D. 

 Figure 91.— Female, P3; sample 30; scale D. 

 Figure 92.— Female, P4; sample 30; scale D. 

 Figure 93. — Male, habitus, dorsal view; sample 31; scale B. 

 Figure 94. — Male, habitus, lateral view; sample 31; scale B. 

 Figure 95. — Male, Mn blade; sample 31; scale G. 

 Figure 96.— Male, Mxp Bl-2; sample 31; scale D. 

 Figure 97.— Male, P5; sample 31; scale D. 



44 



