1912.] R. B. SEyMOUR-SEWELL: Surface-Living Copepoda. 3,41 
stage; the teeth are lancet shaped and are larger in the centre 
than at the two ends. The 19th—21st segments bear a toothed 
plate, which extends nearly the whole length of the joint, and the 
22nd segment is produced distally in a sharp process which ex- 
tends nearly the whole length of the succeeding segment. 
The 5th pair of legs. The right forms a grasping organ; the 
proximal part of the claw is produced in a slender curved process 
and near the base of this is a single rounded tooth. The distal 
part of the claw is slender and has no teeth. The left leg has a 
short terminal joint, which bears a spine on its external margin 
and has three terminal processes; its inner border is thickly 
fringed with hair. The penultimate joint also bears a terminal 
spine at its distal external angle. 
L. euchaeta. Stage 2, Dimorph. 2. 
Pie xix es: I— 3. 
Giesbrecht, 1892, p. 446, pl. 23, fig. 31, and pl. 41, figs. 7-36. 
Giesbrecht and Schmeil, 1898, p. 135. 
The female of this stage was first described by Giesbrecht 
(1889). I have not been able to see his original description, but 
the specimens obtained by me agree almost exactly with the des- 
cription and figures given by him in his work on the Copepoda of 
the Gulf of Naples (1892), and by Giesbrecht and Schmeil in the 
‘* Das Tierreich’’ (1898). It is therefore unnecessary for me to 
give a detailed description. 
The head and 1st thoracic segment are separate and a faint 
groove indicates the division into the two parts of the cranial 
region, and the 5th thoracic segment is fused with the 4th 
and terminates posteriorly in an angular process; a point in which 
my specimens differ from the description is in the sharp forward 
bulge of the forehead. The rostral spines are long and slender. 
No rostral lenses are present but there is a small ventral lens. 
The abdomen has three segments and the furcal rami are 
asymmetrical, the left being smaller than the right, and the 2nd 
furcal seta is much longer than the others, more than three times 
their length and nearly 24 times as long as the combined abdomen 
and furca. 
The 1st antenna is composed of 23 segments; their relative 
lengths are given below— 
Segments— 
I. 2. 3. 4. 5. 6. 7. 8. 9. 10. Il. 12. 13. 14. 15. 16, 17. 18. 19, 20. 21. 22. 23. 
32a Ss, ONO Oa ION as, 12) 26,24. 23.30. 39: 30. 42) 41. 27. 274 31. 31 25 
It reaches back nearly to the posterior end of the furca. 
The 5th parr of legs has no separate endopodite, and the exo- 
podite has a row of spines on its external margin and distal end. 
