1912.] R. B. SEvYMOUR-SEWELL : Surface-Living Copepoda. 369 
In several cases, in young specimens, it was found that the 3 
central furcal setae were deeply pigmented at their bases with a 
purple-blue pigment; this appears to grow fainter and is finally 
lost during the later development. 
2. Labidocera euchaeta, Giesbrecht. 
Occurrence: Locality Q. 
Several specimens of both sexes were obtained. 
3. Labidocera kroyeri (G. Brady). 
Occurrence: Localities By EF, OF P, ©: 
On the whole this species was comparatively rare, occurring 
only in small numbers in the localities given above. The females 
were all typical in their structure, but all the corresponding males 
showed some form of variation. 
4. Labidocera kroyeri (Brady) var. stylifera, Th. and Scott. 
Several specimens were obtained showing this variation. 
5. Labidocera kroyeri (Brady) var. burmanica, nov. 
Pl. xxiii, figs. 4 and 5. 
In this form the right side of the 5th thoracic segment ter- 
minates in a branched arrangement of 5 spines. Three of these 
spines are large and conspicuous and two smaller ones project 
respectively from the inner and outer surface of the lower border 
of the projection. In general structure the 5th natatory legs 
closely resemble those of the variety ‘‘ gallensis’’ (Thompson 
and Scott)! from Ceylon; it differs, however, in possessing an 
extra process on the terminal segment of the left leg; this process 
arises from the inner border and is bluntly rounded. 
This variety, like ‘‘ gallensis,’’ has the spine on the right 
basal corner of the first abdominal segment. 
6. Labidocera kroyeri (Brady) var. bidens, nov. 
Plate xxiv, fig. 8. 
A single female, obtained in locality O, presented a varia- 
tion from the normal in the structure of the 5th pair of legs. 
As usually figured and described, the normal exopods of the 
5th pair of legs have no spines on their outer margins, but in this 
case a single spine was present near the termination, and on the 
left side gave a bifid appearance to the exopodite. The endopo- 
dites were normal in structure. In all other respects the structure 
was perfectly normal. 
_} «Ceylon Pearl Oyster Fisheries and Marine Biology,’’ pt. I, p. 251, 
pl. ii, figs. 6 and 7, 1903. 
