FREE-SWIMMING COFEPODS OF THE WOODS HOLE REGION. 
177 
Family CANDACID2E. 
CANDACE Dana. 
Female: Fourth and fifth thoracic segments fused; head anteriorly rectangular ; rostral filaments 
replaced by one or two small projections; lateral corner of last thoracic segment pointed. Abdomen 
consisting of 3 segments, often with asymmetrical genital segment. Anterior antenna; 23 or 24 jointed 
(twenty-fourth and twenty-fifth joints always, second and third often, fused), their proximal joints 
incrassated, with crenated anterior margin; bristles stiff, some elongated; sesthetasks delicate, in part 
rather long. In posterior antennte the distal basal is fused with proximal joint of inner ramus to form 
a thick joint; rami short, outer ramus slender, with elongated second and much shortened end joint. 
Mandible with voluminous basal, short rami and two-pronged blades (Kaulade). Second inner mar- 
ginal lobe of maxilla much elongated, whereas remaining lobes and rami remain small, and third 
inuer marginal lobe and outer 
marginal lobe are wanting; some 
of the usually stiff bristles much 
elongated. Anterior maxilliped 
elongated, without lobes; distal 
bristles robust, falcate. Posterior 
maxilliped small and weak, its sec- 
ond basal joint and inner ramus 
abbreviated. First to fourth pair 
of feet with 3-jointed outer and 2- 
jointed relatively narrow inner 
rami ; proximal basal joint with an 
inner marginal bristle on second 
and third and usually also on first 
pair; distal basal joint of first pair 
rarely with an inuer marginal bris- 
tle. Bristles of rami, as follows: 
In outer rami of first pair, outer 
marginal bristles 1, 1, 2, inner 1, 
1, 4; in the second to fourth pairs, 
outer marginal bristles 1, 1, 3, 
inner 1, 1, 5; inuer rami of first 
pair with 0, 1 outer and 3, 5 inner 
marginal bristles; second to third 
pairs with 0, 2 outer and 3, 6 inner 
marginal bristles; fourth pair 
with 0, 2 outer, 3, 5 inner marginal 
bristles. Outer border of outer 
rami denticulate. Fifth pairoffeet 
abortive, 3-jointed on either side. 
Male: Sexual differences in structure of trunk, anterior antennae, and fifth pair of feet. Last 
thoracic segment often asymmetrical; its right posterior corner characterized by peculiarities in 
structure, size, and coloration; abdomen with 5 segments; genital segment also often asymmetrical, 
with outgrowths on right side; genital orifice siuistral. Left anterior antenna usually with an 
increased number of sesthetasks; right antenna a grasping organ, usually with joints 17 and 18, 19 
and 20, and occasionally also 8 to 10 fused. Right fifth foot 3-jointed, left 4-jointed; right foot ter- 
minating in forceps or in a bristle. 
15. Candace pectinata Brady. 
Genital and succeeding segment asymmetrical in female, the latter projecting backward on right 
side; last thoracic segment of male asymmetrical. Anterior antenna; 23-jointed, comb of eighteenth 
joint of grasping antenna coarsely toothed ; the joints before and after the articulation stout, joint 17 
rather distinctly separated from 18, and 19 from 20. Proximal hook-like bristle of second basal of 
anterior maxillipeds as thick and nearly as long as distal ones. Terminal joint of fifth foot of female 
long, claw-shaped, without inner marginal bristles; right fifth foot of male with forceps. 
F. C. B. 1899 12 
15. Candace pectinata Brady ; a, female, dorsal aspect ; b, male, ’dorsal aspect; c, 
male, right anterior antenna; d, male, fifth pairoffeet; e, female, fifth pair of 
feet. 
