1912.| R. B. SEyMOUR-SEWELL : Sur/ace-Living Copepoda. 335 
In the 2nd antenna the endopodite and exopodite are of nearly 
equal length, the former consists of seven segments and the whole 
closely approximates to the condition found in Paracalanus parvus. 
The mandible is armed with a row of powerful teeth ; they are 
not quite symmetrical, that of the left side having a small extra 
cusp on the large 1st tooth. 
The maxilliped resembles that of A. pediger, Claus (vide Cleve, 
LOO pl. 1, 12. 0): 
The ist pair of legs consists of the usual 3-jointed exopod and 
2-jointed endopod ; the Ist segment of the exopod has no large 
marginal spine, but its place is taken by a short transverse row of 
small spinules; the 2nd joint is also devoid of spines but its outer 
border is fringed with long hairs; the 3rd joint has two marginal 
and along terminal spine, this last being twice as long as the seg- 
ment. ‘The 1st basal joint bears no inner seta and is beset with 
short stiff hairs. The 2nd basal bears a long inner seta. 
The 2nd pair of legs. Both endopodite and exopodite are 
3-jointed. The Ist joint of the exopod has a transverse row 
of short spines near its distal extremity and a well-marked mar- 
ginal spine. The 2nd joint has a well-developed marginal spine 
and an oblique row of 4 long spines on its posterior aspect, but 
no spinules on its margin. The 3rd joint has 2 outer spines and 
a terminal spine but no marginal spinules, it also has a transverse 
row of delicate spinules distally. The 2nd joint of the endopod 
has a row of small spinules on its anterior surface and an oblique 
row of long delicate spines posteriorly. 
The 37d and 4th pairs of legs resemble each other and are 
devoid of the marginal spinules that are present in other members 
of the genus. 
The 5th pair of legs is practically absent, being only repre- 
sented by short rounded unsegmented processes. 
¢ Total length 086 mm. 
The abdomen consists of 5 segments having, together with 
the furcal rami, the following proportional lengths 5:8:6:6:6: 
5, the last three abdominal segments being of equal length. 
The rst antennae resemble those of A. gibber and A. gardinert 
in that the first six segments are fused together to form a solid 
mass, separated by a constriction from the remainder of the seg- 
ments. Segments 7 and 8 are also fused and the relative propor- 
tions of the joints are as follows :— 
Segments— 
1-6 7-8. 9. IO. II. 12. 13. 14. 15. 16. 17 18. 19. 20. 21. 22. 23. 24. 25. 
Rare =eeeecs OO bys Say CaS. On ns Oe OL ekO ION G SaTO ssn 1046: 
The 2nd antennae differ from those of the female in that the 
last segmerit of the exopodite ends in a stump devoid of bristles, 
A 5th leg is only present on the left side and resembles that 
of A. gardineri in that it is composed of a basal portion and four 
joints. The last joint bears two terminal processes, one long and the 
other short, and the penultimate joint also bears a terminal spine. 
