166 S 
Stat. 35, 2 specimens. — Stat. 37, 3 specimens. — Stat. 81, 3 specimens. — Stat. 98, I 
specimen. — Stat. 99, 2 specimens. — Stat. 109, 3 specimens. — Stat. 110, 1 specimen. — 
Stat. 117°, I specimen. — Stat. 142, I specimen. — Stat. 144, 2 specimens. — Stat. 165, 
I specimen. — Stat. 189%, 3 specimens. — Stat. 213, I specimen. — Stat. 315, 2 specimens. 
This species is readily recognised when mixed with the other members of the genus, by 
the following characters. The abdominal segments of the female are furnished with strong spines 
and teeth. The right side of the last thoracic segment of the male is produced into a bifid 
process. The males appear to be rather variable, both in the form of the right projection of 
the last thoracic segment, and in the length of the thumb-like process on the first joint of the 
exopodite of the right fifth foot. Two varieties of the male fifth pair are shewn in the report 
on the Ceylon Copepoda. By a misprint it is stated in that report that the left side of the last 
thoracic segment of Ladzdocera kroyert var. gallensis has a trifid projection. It ought to read 
right side of course. Only the typical form was obtained from the ‘Siboga’ plankton. 
Labidocera kroyert has been recorded from the Indian and Pacific Oceans. It has nee 
been found in the North Atlantic off the West of Ireland. 
4. Labidocera laevidentata (Brady). Plate LI, figs. 1—10. 
Pontella laevidentata Brady, 1883, p. 93, pl. XXXVIII, figs. 1—6. 
Labidocera laevidentatum Giesbrecht, 1893, p. 446. 
Labidocera laevidentata Giesbrecht & Schmeil, 1898, p. 137. 
Labidocera laevidentata Wolfenden, 1905(@), p. 1019, pl. XCVIII, figs. 20, 26, 27, 28, 38 (male). 
Labidocera kroyerit var. similis Wolfenden, 1905 (a), p. 1016, figs. 22, 23, 33 (female). 
This rare form was found in the plankton collected at the following two Stations in the 
area traversed by the ‘Siboga’. 
Stat. 66, 75 females and 76 males. — Stat. 71, 1 male. 
Brapy described the species from a single male specimen found in plankton collected — 
off Sibago Island, Philippines, on October 23rd, 1874. The species was not again met with 
until WoLFENDEN recorded the male in 1905, from the plankton collected around the Maldives 
J. STantey GARDINER. WOLFENDEN states that only the males are known, but the form he 
describes as Ladidocera kroyert var. semilis, is undoubtedly the female of Ladzdocera laevidentata, 
The fifth pair of feet has not the slightest resemblance to the fifth pair of the female of 
Labidocera kroyert. 
The cephalothorax of the female is very similar to that of the male. The cephalic 
segment is furnished with lateral hooks. Seen from above, the forehead is broadly angular in 
outline. The side hooks are much nearer the frontal margin than in any of the other members 
of this genus that have hooks (Plate LI, fig. 1). The last thoracic segment is symmetrical. 
The posterio-lateral angles are produced into spines. The spines are rather divergent. The rami 
of the rostrum are stout at the base, and are drawn out to a moderately fine point at the 
apex. There does not appear to be any articulation between the rami and the basal part. The 
excavation between the rami is wedge-shaped (Plate LI, fig. 3). 
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