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Remarks. This remarkable form was made the subject of a separate 

 dissertation by Mr. Aurivillius for his doctor's degree, and in this disserta- 

 tion not only the structure of the adult animal of both sexes, but also the 

 development, was treated of. Dr. Aurivillius recognised in it the type of a very 

 distinct genus, the systematic relation of which to the other known Harpacticoid 

 genera was discussed in detail. 



Occurrence. As mentioned above, Dr. Aurivillius found this peculiar 

 Copepod on the baleen of a blue-whale recently killed at the whaling-establish- 

 ment of Mr. Foyn at Vadso, east Finmark. On examining the baleen, his at- 

 tention was directed to some yellowish patches scattered over their surface, and 

 on a closer inspection he found these patches to be made up of innumerable 

 specimens of this Copepod in all stages of development and densely crowded 

 together. As justly remarked by that author, the present Copepod can scarcely 

 be regarded as a true parasite, but is more properly speaking a commensal of the 

 whale, subsisting on the remains of food adhering to the baleen after being sifted 

 through it. In orders to kepp its place on the baleen and resist the strong cur- 

 rent of water streaming through it, powerful grasping organs are needed, and 

 such are indeed found not only in the adult animal, but, as shown by Dr. Auri- 

 villius, even in the newly-hatched Nauplius, which of course, unlike what is 

 generally the case, leads a rather sedentary existence. I have not myself come 

 across this form, nor has it as yet been observed by any other naturalist. The 

 figures here given are drawn from specimens kindly sent to me by Dr. Aurivillius. 



