BOBHOPODA. 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 NKMATOSCKLIN.K, Holt and Tattcrwll. 



GENUS THYSANOESSA, Brandt 



THYSANOKSSA MACRURA. 



(PI. III., Figs. 1-12). 



Tkyttmtitta mamtra, U. 0. San, 18*8; id. (1885); Orttmimi, 1M98 ; Htebbing, 1900; Holland 

 TaUenall, 190C (1) ; Conttare, 190C. 



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, G 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 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. 







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 anteunules ; there is a low 

 keel on the anterior part of the carapace behind the rostrum, and a very faint 

 gastro-hepatic groove. 



Pleon (Fig. 1) rather elongate, narrow and attenuate; segments unarmed; sixth 

 segment equal to or slightly less than the combined lengths of the preceding two; 



