12 R. N0REI8 WOLFENDEN. 



first character probably results from the bad preservation of the animals ; the second is 

 a character of other members of this genus ; and the third point is characteristic of 

 gracilis and rohustior. 



Scott merely mentions that " the large and tumid first abdominal segment seems 

 to be a fairly good character" {loo. cit.). However, this is not a characteristic of this 

 species any more than of C. rohustior, and the existence of this species up to the present 

 time therefore must be regarded as extremely doubtful. However, the 'Discovery' 

 collections contain several examples of a copepod, which, if it is not Brady's species, 

 answers fairly well to it so far as his description goes. 



? 3 "5-3 '6 mm. long (cephalothorax, 2*75 ; abdomen, '75. Body broadest at the 

 end of the first thoracic segment ( 1 • 1 mm. broad). Abdomen short, genital segment 

 broad, and one-third broader than the following segment. Furcal segments not quite 

 twice as long as broad, and nearly twice as long as the anal segment. Head evenly 

 rounded, without trace of crest, separate from the first thoracic segment, last thoracic 

 segment only slightly produced, and with rounded margins. Anterior antennae only 

 reaching the end of the third abdominal segment, the only long bristles on the twenty- 

 third, twenty -fourth, and twenty-fifth segments, the twenty -fourth joint twice as long as 

 the twenty-fifth. Mouth parts resembling C. finmarchicus. 



Second feet — second basal with four large spines on the distal margin at the inner 

 side. Be 3 divided by the external outer spine into proximal and distal portions 

 respectively as 23 : 16. Ri?, with eight bristles. The whole endopodite does not 

 reach beyond the distal margin of Re 2. Re 8 as large &s Rel -f Re 2. 



Third feet — four large spines on 5 2 distal inner margin, endopodite reaching a 

 little beyond the distal margin of Re 2. Re 3 divided into proximal part = 32, distal 

 portion =16. Ri 3 with eight bristles. 



Fourth feet — Re 3 divided into proximal part =37, distal = 15 ; apical saw only 

 seven-ninths as long as Re 3. Ri with seven bristles only (three inner, two outer, two 

 apical). B 2 with one or two spines on distal inner margin. 



On the second, third, fourth and fifth feet the outer margin of the second basal is 

 distally armed with a spine ; in second— fourth, the ReZ = Rel -\- 2, and is about 

 three times as long as broad. 



Fifth feet — first basal with straight inner margin without teeth or hairs, B 2 with 

 five spines on the distal inner surface. Ri 3 with six bristles (two inner, two outer, 

 two apical). 



The only Calanus with which this shows agreement is, possibly, Brady's C. tonsus ; 

 but Brady's description is so fragmentary that it may well be another species. It 

 occurred in some numbers at Station, 22- 11 -01, Lat. 56° 31' S., Long. 156° 19' 30". 

 Such males as were observed were all immature. 



