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The antennae, mandibles and maxillae, are similar to those of Farran’s species (Oxy- 
calanus spinifer). 
The first and second pairs of maxillipedes also resemble those of Oxycalanus spinifer. 
The lower margin of the basal joint of the second pair of maxillipedes is furnished with a 
transverse row of short spines. 
The first pair of swimming feet has a three-jointed exopodite, and a one-jointed endo- 
podite shewing a faint trace of subdivision (Pl. I], fig. 17). 
The second pair of swimming feet has a three-jointed exopodite, and a two-jointed 
endopodite. The second joint of the exopodite has one row, and the third joint two rows, of 
fine spines (PI. II, fig. 18). 
The third and fourth pairs of swimming feet have three-jointed exopodites and endopodites. 
The first joint of the basiopodite of the third pair of feet has two rows of fine spines on its surface. 
The surface of the second joint of the exopodite of the third pair of feet has one row, and the 
third joint two rows, of fine spines. The second and third joints of the endopodite of the third 
pair of feet, have each two rows of fine spines. The second joint of the exopodite of the fourth 
pair of feet has two rows of fine spines, and the third joint is well covered with fine spines. 
The endopodite of the fourth pair of feet has a similar spinulation to that of the third pair. 
The first basal joint of the fourth pair of feet has about six spines on the inner margin. There 
is a well defined row of long acicular spines traversing the posterior surface of the first joint 
of the basiopodite of the left foot only (Pl. I, fig. 21). The terminal spines of the second, 
third, and fourth pairs of feet, have finely serrate lamina. 
The fifth pair is entirely absent. 
Male unknown. 
Occurrence — eighteen specimens of this Calanoid were found in collections taken 
at the following stations. 
Stat. 118, 2 specimens. — Stat. 141, 4 specimens. — Stat. 143, 4 specimens. — Stat. 148, 
2 specimens. — Stat. 185, 1 specimen. — Stat. 203 (1500 metres to surface), 2 specimens. — 
Stat. 230, I specimen. — Stat. 276, 2 specimens. 
The species although bearing a general resemblance to Oxycalanus spinifer Farran, 
appears to differ from it in the following points: — The genital segment is asymmetrical and 
rather longer. The antennules are much longer. The first joint of the basiopodite of the left 
fourth foot only, is traversed with a single row of long acicular spines on the posterior surface. 
There are no spines on the second joint. Farran states that the second joint of the basiopodite 
of the fourth foot of Oxycalanus spinifer, has two transverse rows of long acicular spines, and 
does not refer to any armature on the first joint. 
Genus Monacilla Sars, 1905 (a). 
This genus was established by Professor G. O. Sars in 1905 for the reception of a 
Calanoid closely related to CJlawsocalanus. The characters which separate it from that genus 
are: — A more robust body with very short and thick rostral appendages: — The second 
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