aeeording as chance fastens them to one fish or anothi 

 er as a host, and aeeording as they fasten in soft 

 tissue or under less favorable conditions on a fin, 

 is soifTetning that we icnow nothing aoout* 

 In the present instance we were convinced that an 

 attachment oetween tne fin rays at least often p ro- 

 due ed the unequal angle of tne side horns, and possi- 

 Dly caused the projection of the third horn, just as 

 we have often noticed in Lernaea and HaemoDaphes a 

 conneetion oetween the outward conditions and the 

 oranching of the horns, or their growth. 



Baird has de ser To ed in the Annals of Natur al 

 History,vol.l9,p.2SQ,a inuch larger Pennella from a 

 "dolphin" or "Coryphaena" from a more southern por- 

 tion of the Atlantic, and has named it P.pustulosa. 



Since the head and horns have an entirely dif- 

 ferent form and the plumules in spite of the animal's 

 size ar e def initely stat ed to oe unbranched we inay 

 assume that this species has no connection with ours 

 from Coryphaena. 



