No. 2194. NORTH AMERICAN PARASITIC COPErODS— WILSON. Ill 



Blainville's "new genus*' Lerneopenna. But Steenstrup and Liit- 

 ken's statement holds good to-day; it has never been described with 

 enough detail to enable it to stand as a separate species. 



Lerneopenna hrackiata Blainville (1822, p. 44C, pi. 1, fig. 4). A 

 synonym of Pennella sagitta (see p. 113). 



Penella costal Eichiardi (1880, p. 150). This is a nomen nudum 

 and probably identical with Pennella filosa. 



Pennella diodontis Oken, Chamisso, and Eysenhardt (1821, p. 350, 

 pi. 24, fig. 2). A synonym of P. sagitta (see p. 113). 



Pennella gracilis and P. intricata A. Costa. Cams in his Prodromua 

 Faunae INIediterraneae (1885, p. 374) mentions these two species and 

 ascribes them to A. Costa, but adds " Hospites, loci, descriptio?". He 

 himself was as badly at fault since he did not give the reference in 

 which A. Costa mentioned these species, and all efforts to find such a 

 reference have failed. 



Leimeopenna holteni Desmarest (1825, p. 347). AVlien Desmarest 

 transferred Holten's species, Lemaea exocoeti, to Blainville's genus 

 Lerneopenna, he also changed the specific name. But of course there 

 was no Avarrent for this and so his name, holteni, becomes a synonvm. 



Penella plumosa DeKay (1844, p. CO). DeKay described (1822, 

 p. 87, 1 text figure) a mutilated specimen of a parasite from " Diodon 

 pilosus " sent to him by Doctor Mitchill, which he was satisfied did 

 not belong to any genus as yet established. Afterward in his Zool- 

 ogy of New York he evidently redescribed the same creature and 

 gave it the above name. 



Either he himself or the printer made an error in the name of 

 the host, and gave it as " Diodon plumosus of this report." Fow- 

 ler (1913b, p. 91) suggested that, as such a fish was not named in 

 DeKay's report, it was proably a mistake for DeKay's '■''Diodon full- 

 glnosus,''^ which does appear in the report, and he made DeKay's 

 species a synonym of P. filosa. 



But it seems more probable that the specific name of the parasite 

 was in some way substituted for that of the host, the two being very 

 similar, and that DeKay was redescribing and naming the same 

 species that he had in 1822, of which during the intervening years 

 he had obtained better specimens. This would make it a synonym 

 of P. sagitta, which infests Diodon, and not of P. filosa, which has 

 never been found on that genus of fishes. 



Penella remorae Murray (1856, p. 299, 5 text figures). This 

 species was found attached to the sucking disk of '"''Echeneis re- 

 mora,'''' and all that was described and figured was the portion out- 

 side the disk, the part buried in the tissues of the fish having been 

 destroyed in an attempted dissection. But this posterior portion of 

 the parasite showed plainly that the specimens were immature, the 

 plumose appendages having only just started to grow. A remora 



