CRUSTACEA COPEPODA. II. 25 
destitute of setz’’; besides his figures of antennula, antenna and fourth leg show some differences, which 
scarcely can be due to variation or incorrect drawing. 
The new species exhibits rather close relationship to Botryllophilus macropus Canu in the structure 
of antennule, antenne, mandibles, maxillule, maxillipeds and caudal rami, but the thoracic legs are more 
reduced and the fifth pair very different. If the genus Blakeanus shall be maintained, the essential differences 
are the extraordinary inflation of the cephalothorax and the shape of fifth legs; the differences in all other 
appendages are scarcely of generic value, as f. inst. the two species of Botryllophilus, B. macropus Canu and 
B. brevipes G. O. S. show many differences from one another in the appendages. It may be added that when 
Wilson says that his animal “can not be located in any of the existing families” of the group Notodelphyoida, 
be based his conclusion on the assumption that nothing corresponding to the “curved horns” is known in 
any other Copepod — though these horns are in reality only the fifth pair of thoracic legs, which in Botryl- 
lophilus have a similar position, but are generally somewhat less altered. 
Occurrence. — Not taken by the “Ingolf’ but many years ago by Mag. sc. M. Levinsen. 
West Greenland, probably Egedesminde. In Cynthia rustica, 2 females (one among them unfortun- 
ately lost). 
Botryllophilus Hesse. 
Of this remarkable genus a single new species has been secured in the “Ingolf’’ area. 
29. Botryllophilus inzequipes n. sp. 
(Pl. III, figs. 2 a—2 f.) 
Female. — This species is similar to B. brevipes G.O.S. and agrees with it in most particulars. 
Thus it may scarcely be possible to point out specific differences between them in antennule (fig. 2 a), antennze 
(fig. 2b), mandibles (fig. 2 c), maxilla, maxillipeds, fifth pair of legs, or in the abdomen with its furcal rami, 
each terminating in 4 curved claws. But B. inequipes differs from B. brevipes Sars and agrees with b. ruber 
(?Hesse), T. Scott in having the thoracic segments distinctly marked off from each other, and it differs 
sharply from B. brevipes in the structure of first to fourth pairs of thoracic legs. Sars says as to these legs 
in his B. brevipes that they are “much reduced, with both rami quite short and uniarticulate’”’, but in B. in- 
a@quipes the exopod is uniarticulate, the endopod 2-jointed in the two anterior pairs, while in third and fourth 
pairs both rami are 2-jointed. In B. inequipes first leg (fig. 2d) has 8 strong and long sete on the second 
joint and a single seta on the outer margin of first joint of the endopod, while the exopod is oblong and some- 
what triangular, with 5 spines on the outer margin. Fourth legs are very characteristic especially in the fact, 
that the two legs of this pair differ from one another; the right leg (fig. 2 e) has the endopod considerably 
longer than the exopod and equipped with in all 5 partly long sete, one among them on the inner margin of 
the proximal joint, and this joint is considerably longer than the second; the exopod has 4 spines, viz. one 
long and strong spine at the end, one spine on the inner margin, and two spines rather remote from one 
another on the outer margin. In the left leg (fig. 2 f) the 5 setae on the endopod are much longer than those 
on the right leg and distally very thin, furthermore the endopod is turned in a curious way so that it, when 
the leg is seen from below (from in front), has the real inner margin directed forwards and even somewhat 
The Ingolf-Expedition. III. 7. 4 
