5 the month of June 1878, when at Wadsö in East-Fin- 
mark, Norway, on the Waranger-fjord, the author and his 
companion Mr C. W. FORSSTRAND observed on the baleen- 
plates of a Balcenoptera Sibbaldii GRAY just captured a num- 
ber of large yellowish-white spots, which on a closer exami- 
nation Were found to consist of innumerable ecrowds of a 
Copepod in all stages of development, from the new-hatched 
Nauplius to the adult Cyclops, all firmly adhering to the 
plates by means of strongly armed limbs, and evidently at 
home there. Concluding from this very singular and hitherto 
unobserved mode of living to its frequent occurrence on this 
species of whale, I searched every specimen of it, as well as 
of B. musculus COoMP., that was captured during our stay at 
the establishment of Mr SvEnND FOYN, but always in vain. 
Still this epizoic Copepod may not be so very rare, although 
easily overlooked. 
Its most marked character, the strongiy developed claws, 
is clearly in accordance with its epizoic manner of living. 
For if allied genera of Copepods are in need of their claws 
is order to ecling to seaweeds and similar objects, this genus 
is still more so for the purpose of adhering to the surface 
of the baleen-plates while the water is violently rushing 
through them. The only species known is the type of the 
new genus 
BAL/AZENOPHILUS”) nov. gen. 
Char. gen. Corpus fere cylindricum. Antenn&e antice 
octoarticulate; posticx biarticulate, ramo secundario articulo 
uno parvo. Palpus mandibularum minimus, tuberculo seti- 
gero formatus. Palpus maxillarum simplex. Maxillipedes 
") qelerae whale and qios friend. 
