Al exceeding caudal rami by nearly 2 segments; ter- 

 minal segments (Fig. 159) of moderate length and 

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

 4. 



A2 Rel with 2 setae. 



Mn B2 inner distal anterior surface and Ril surface 

 with long setules. Blade broken on specimens exam- 

 ined. 



Mxl gnathobase posterior surface apparently with 3 

 proximal setae; without seta on distal anterior sur- 

 face. 



Mx2 with proximal setule-covered hump and outer 

 seta; posterior surface of lobe-5 base without spines. 



Mxp (Fig. 143) Bl without spine-comb; anterior 

 surface with several rows of short to long setules; dis- 

 tal lobe with ascending oblique row of denticles 

 followed by descending row of short stiff hairs. B2 out- 

 er edge with transverse spine-comb; longitudinal row 

 of stiff hairs. Ri4-5 outer setae nude, bladelike, taper- 

 ing toward each end; spinules on inner edge of Ri5. 



PI (Fig. 144) Bl outer distal edge with few spines, 

 inner margin with hairs. B2 inner surface with spines 

 and inner margin with hairs; anterior surface with few 

 central setules and outer distal row of spinules. Rel 

 outer spine reaching base of following spine; Re2 outer 

 spine reaching beyond base of following spine. Rel 

 anterior surface with outer distal row of spinules. Re3 

 midposterior surface with 4-7 spines. 



P2 (Fig. 145) Bl inner and outer surface with rows 

 of strong spines; inner margin with hairs. Re3 without 

 proximal row of spines; midlength row with 5-6 

 spines; distal row with 4-6 spines. 



P3 (Fig. 146) Bl inner and outer surface with rows 

 of strong spines; inner margin with hairs. Re2 

 posterior surface with proximal row of strong wide 

 spines and distal row of denticles. Re3 posterior sur- 

 face with 3 evenly spaced rows of spines; spines in- 

 creasing in width and decreasing in number distally. 

 Ri3 posterior surface with proximal row of 7-9 spines 

 and distal row of 3-5 stronger spines. 



P4 (Fig. 147) Bl proximal outer surface with few 

 rows of spines, smaller than on P2-P3; inner surface 

 with setules. B2 posterior surface with inner 

 transverse row of spinules as on S. horridus and S. 

 spinosus. Re2 posterior surface with proximal row of 

 strong wide spines and distal row of small spines. Re3 

 posterior surface with 3 evenly spaced rows of spines. 



Re terminal seta with the following number of 

 teeth: P2 (30-34); P3 (28-29); P4 (33-38). 



Male. — Length 1.70-1.9 mm. Some Al segments 

 damaged on specimen examined: IV-2s, 2e; VIII-2s, 

 2e; XV-?ls, le; XIX-ls, le; right XX-0; left XX-le. 



Mxp Ri5 inner edge with spinules. 



Other details known only from one damaged 

 specimen reported by Bradford (1971). PI Re3 

 posterior surface with spines. P4 Bl with inner seta 

 (Bradford, fig. 26). P5 shown by Bradford (fig. 22), in- 

 complete; biramus, left-handed. Left Bl reaching 



middle of right B2; left B2 reaching nearly to end of 

 right Rel. Ends of Re long terminal setae and Ri 

 broken. Both Ri presumably reaching beyond Re3. 



Remarks 



Farran (1929) reported a group of large (1.8-2.06 

 mm) S. abyssalis from the Pacific Sector of the Ant- 

 arctic. Some of these specimens were examined in the 

 present study (sample 6, Table 3) and were found to 

 be a new species, S. terranouae, described above. 



Vervoort (1951) reported three female S. abyssalis 

 from the Atlantic Sector of the Antarctic. His 

 specimens are considered S. terranouae in the present 

 study, although they might be S. brevicaudatus or 

 other species. The smallest specimen, 1.65 mm, is ten- 

 tatively included in the length range of females. 



Vervoort's (1957) specimens of S. abyssalis are con- 

 sidered S. terranouae in the present study. The length 

 range of males reported by Vervoort (1.70-1.85 mm) is 

 included in the above description. Vervoort's list of 

 specimens from each sample indicates one male 2.20 

 mm, but this most likely should read "female." 



Bradford (1971) reported two size groups of S. 

 abyssalis; only the larger was S. terranouae, the 

 smaller was S. abyssalis Giesbrecht. 



Distribution 



Probable records of S. terranouae, previously known 

 as a large S. abyssalis, are summarized below: 



Antarctic 



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

 voort (1957, 1965), 250-1,000 m. —Bradford 

 (1971), 0-1,300 m. 



Indian Sector: Vervoort (1957, 1965), 100-1,500 

 m. — Tanaka (1960), 0-400 m. 



Atlantic Sector: Vervoort (1951), 0-900 m. 



Hardy and Gunther (1935) reported a Spinocalanus 

 species from the South Atlantic (300-2,000 m) which 

 might be S\ terranouae. 



Etymology: The specific name, terranouae, from the 

 British Antarctic ("Terra Nova") Expedition, 1910. 



Genus MoNACiLLA Sars, 1905 



Oxycalanus Farran, 1908. 

 Hypsicalanus Wolfenden, 1911. 



Type SPECIES: Monacilla typica Sars, 1905. 



Description 



Rostrum 2-pointed. Pi Rel with outer distal spine, 

 reduced in male; Rel -2 together longer than Re3; Ri 

 with 3 inner setae. P2 Ri2 with I outer seta. P3-P4Ri3 

 with 2 outer setae. Posterior surface of certain 



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