4 CRUSTACEA COPEPODA. II. 
Division Harpacticoida. 
No form of this gigantic division is known to be parasitic. But as Kroyer has described a species 
found on the branchiz of a large shrimp from Greenland, it may be convenient to give some information 
on that animal. 
Machairopus Hippolytes Kr. 
1863. Canthocamptus? Hippolytes Kroyer, Nat. Tidsskr. 3. Rekke, B. II, p. 408, Tab. XVIII, fig. 9, a—b 
Kroyer established this species on a few specimens taken on the branchize of Spivontocaris groenlan- 
dica J. C. Fabr. (Aippolyte aculeata O. Fabr., Kroyer). His description and figures are too imperfect for allowing 
the recognition of the form, but the Copenhagen Museum possesses two of his specimens moderately well 
preserved. The examination proved that the animal belongs to the genus Machairopus Brady, and the species 
is closely allied to M. minutus G.O.S. I have been unable to find any difference of undoubtedly specific 
value in the antennule, antenne, maxille, maxillipeds and thoracic legs, excepting first pair of legs. But 
in this leg the exopod is conspicuously shorter in proportion to the endopod than in M. minutus and does 
not reach the end of the proximal joint of the last-named ramus, while the partly curious setee on both rami 
are very similar to Sars’ figure; in the maxillule the two extremely long terminal sete are longer than in 
Sars’ figure and, what is more important, one of the lobes has a very long, distally much curved seta directed 
backwards and inwards and reaching almost the insertion of the maxilliped on the opposite half of the ventral 
side, and this seta is not shown by Sars. There may be some other differences in the maxillule and perhaps 
in the mandibles, but more could not be perceived in these mouth-parts or in any other appendage without 
a dissection which I would not attempt, as the specimens are not only very small co-types, but besides fragile, 
as they are very old. One of the specimens is 0.85 mm. long, thus a little larger than M. minutus. 
The specimens found by Kroyer have probably been introduced quite occasionally into the branchial 
cavity of the Spivontocaris; it is to be supposed that specimens can be gathered between algze at West Green- 
land, and then a comparison with Kréyer’s co-types and a special investigation and comparison with M. mz- 
nutus may be undertaken. 
Division Cyclopoida. 
Cyclopina Claus. 
This genus is mentioned, because a single new species has been found in Ascidians, and even at two 
localities. The material of free-living Copepoda has not been looked through for finding other forms of the 
genus or of the family Cyclopinidee sens. Sars. 
1. Cyclopina Phallusiz n. sp. 
(Pl. I, figs. 1 a—r i.) 
Female. — Rather allied to C. gracilis Claus and C. longicornis Boeck. It differs from all other species 
known in having the first thoracic segment marked off moderately distinctly from the head. The head (fig. I a) 
is flattened and therefore seemingly laterally expanded, being considerably broader than the first thoracic 
segment, which is considerably shorter than the second. — Genital segment distinctly longer than broad, 
