SCHIZOPODA. 
17 
the spine, at any rate in this species, developes late in life, only after the final adult 
form is reached. 
The species was taken on the homeward voyage of the ‘ Discovery,’ in the 
extreme southern part of the Pacific Ocean between New Zealand and Cape Horn. 
Sub-Family Nematoscelin^e, Holt and Tattersall. 
Genus Thysanoessa, Brandt, 
Thysanoessa macrura. 
(PI. III., Figs. 1-12). 
Thysanoessa macrura, G. 0. Sars, 1883 ; id. (1885) ; Ortmann, 1893 ; Stebbing, 1900; Holt and 
Tattersall, 1906 (1) ; Coutiere, 1906. 
Localities of captures ;— 
Winter Quarters. 
No. 4 Hole, 47 specimens, 7-18 mm. 
No. 8 Hole, 40 ,, 8-21 mm. 
No. 12 Hole, 2 „ 7 and 20 mm. 
From River Koettlitz, 2. 1. 03, 6 specimens, 9-14 mm. 
Outward or Homeward Journey. 
Lat. 61° 46' S., long. 141° 12' E., 16. 11. 01, 18 specimens, 14-20 mm. 
Lat. 57° 25' 30" S., long. 151° 43' E., 20. 11. 01, 35 specimens, 12-22 mm. 
Lat. 54° 1' 15" S., long. 170° 49' E., 27. 12. 01, 1 specimen, 6 mm. 
Lat. 61° 13' 30" S., long. 173° 33' E., 31. 12. 01, 30 specimens, 12-19 mm. 
Lat. 66° 52' 9" S., long. 178° 8' 15" E., 3. 1. 02, 3 specimens, 8-9 mm. 
Lat. 70 c 29' 27" S., long. 168° 51' 46" E., 26. 2. 04, 1 specimen, 28 mm. 
Lat. 49° 40' S., long. 172° 18' 30" W., 12. 6. 04, 2 specimens, 8-12 mm. 
Lat. 58° 49' 45" S., long. 154° 48' W., 24. 6. 04, 4 specimens, 10 mm. 
Lat. 59° 34' 30" S., long. 106° 28' 12" W., 28. 6. 04, 3 specimens, 7 mm. 
Lat. 55° 44' S., long. 95° 43' 30" W., 1. 7. 04, 3 specimens, 6-8 mm. 
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Form (Fig. 1) of the body rather slender. 
Carapace (Fig. 1) with a single rather long slender spine on the lower lateral 
margin posterior to the middle, just above the origin of the sixth thoracic limb; 
antero-lateral corners acute and somewhat produced; anterior margins very concave 
and produced forwards into a long, slender, acute rostrum which reaches beyond the 
eyes and far beyond the middle of the basal joint of the antennules ; there is a low 
keel on the anterior part of the carapace behind the rostrum, and a very faint 
gastro-hepatic groove. 
Pleon (Fig. l) rather elongate, narrow and attenuate; segments unarmed; sixth 
segment equal to or slightly less than the combined lengths of the preceding two; 
