the Atlantic, ,outside of the differences in the hos 

 we might ment ion the greater ftreadth of tne so-call 

 "Head" ,and the swelling of its side portions into 

 toleralDly regular hemispheres,at least wnen seen fr< 

 tne dorsal side,together witn tne smallness of tne 

 mouth-parts compared witn tne size of tne amimal,an 

 the thickness of tn© 21 three- or four-parted plumu 

 on tne ao domen. Tne enlarged <T igure of tne 

 anterior portion of tne oody shows how in this spec 

 and the forego ing we found the swimming legs and tn 

 second antennae placed. With reference to the an- 

 imal's attachment to its host we may note that all 

 thfee spec imens were fastened to the anterior part 

 of the host 1 s oody,near or at least not far from tn 

 gill clefts,and that all were deeply tmried in the 

 flesh,and that one alone was found with its head an 

 mouth-parts ouried in the liver,whose anterior half 

 seemed to oe in a partially discolored conditioon. 

 The P.TDlainvillii deserioed "by LeSueur was 

 also taken from an Exocoetus volitans,out differs s« 

 much from ours,ooth in the older and the younger 

 stages, that we may regard it as quite distinct. 



On tne contrary P.exocoeti seems to come neare 

 to P.f ilosa,which we helieve inhaMts the Atlantic, 



