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The male of Scottocalanus persecans is readily distinguished from the males of any of 
the other species, by the moderately long spine on the rami of the rostrum. No other known 
species belonging to the genus has the rostral spines so much elongated. The apex of each 
spine is distinctly bifid. 
When viewed from the side, the posterior margin of the last thoracic segment is seen 
to be broadly rounded, and there is a deep notch at the junction with the ventral edge. The 
crest is high and rather narrowly rounded at the apex. 
The combined length of the abdomen and furca is contained two and a half times in 
the total length of the cephalothorax, from the apex of the crest to the base of the genital 
segment. The first four segments of the abdomen are of about equal length. 
The antennules are nineteen-jointed and extend to the furca. 
The exopodite of the right fifth foot is two-jointed and sickle-shaped. The endopodite 
is moderately long and spiniform. It is only slightly curved and extends to the distal end of 
the second joint of the basiopodite. The two joints of the exopodite are cylindrical and of 
nearly equal length. The inner margin of the second joint terminates in a sharp point. The 
apex of the joint bears two curved spines and a pad of short hairs. The endopodite is simple 
and somewhat spiniform. It is nearly as long as the exopodite. Length of male 4,4 mm. 
I do not think there can be any doubt, that this species is identical with the form 
described by Gresprecut as Scolecethrix persecans. The side view of the rostrum, and the figure 
of the fifth pair of feet given by that author, are the same as the figures given in this report. 
This species is not the same as the male form illustrated in my father’s report ‘On Entomostraca 
from the Gulf of Guinea’, which Farran has recently erroneously made out to be the male of 
Scottocalanus persecans. 
The female is partly described by Farran, but this probably requires further verification, 
as to the correctness of the identity with GIrSBRECHT’s species. 
Some of the records of this species must be regarded with suspicion, owing to the con- 
fusion that has occurred between two of the known species. EsTERLy’s record of the male is 
correct, and I have seen specimens of the male from the deep water of the Farée Channel. 
3. Scottocalanus farrani nov. sp. Plate XXIV, figs. 1—9 (female). Plate XXIX, figs. 
11—18 (male). 
Female — length 3,5 mm. 
Viewed from above, the body appears elongate ovate and moderately robust. The forehead 
is furnished with a high crest. The last thoracic segment is produced posteriorly, and is angular 
in outline. Seen from the side, the crest appears high and the apex is narrowly rounded. The 
rostral points are short, and the posterior margin of the last thoracic segment is very narrowly 
rounded. The basal portion of the rostrum is moderately robust, and the apical points are 
equal to the depth of the excavation. : 
The combined length of the abdomen and furca is contained three and a half times in 
the total length of the cephalothorax, from the apex of the crest to the base of the genital 
segment. The genital segment is nearly as long as the combined length of the next three 
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