i pair of speciinens having to een given to the Museum 

 )y Prof .Reinhardt from nis last voyage and which, 

 ;ogether witn many otners,were taKen from an Ort&ago- 

 :isCus-liKe fish. The differences oetween the 

 iwo species seem to us to lie chiefly in the strenger 

 rrinlcling of the swollen portion of the toody and the 

 ib dom en in P.f ilosa,together with the more profuse 

 ) ranch ing of the plumules,and the fa.ct that the in- 

 terval oetween the wrinlcles in this species has a 

 iransverse ridge of small warts. If there toe- 

 lany closely related species confused with one anoth- 

 *r under the common name of P.filosa,as seems possiole, 

 re may note that the Mediterranean Pennella from the 

 iwordfish must toe taken for the type species, out we 

 .ave not had this for comparison with ours., 



PENNELLA CRASSICORNIS Steenstrup & Lutken. 

 It was so far as we icnow the first time that a 

 ernaean parasit e was Known to live on a warm-tolooded 

 nimal when Herr Sysselmand H. Muller of Thorshavn on 

 he Faroe Islands in 1855 sent us a toottle filled with 

 his Pennella; all the spec imens in it were taicen 

 'rom one and the same Hyperoodon rostratus,captured 

 he same year at Sudero. Although we have not 

 ir.ee taicen them from this host,yet we have reasons 

 or assumlng that they are not seldom found on this 



