177] PROTEOCEPHALIDAE—LA RUE 177 



PEOTEOCEPHALUS MACROPHALLUS (Diesing) sp. inq. 



This form is known only from the writings of Diesing listed above. 

 His statements are wholly inadequate for purposes of comparison and 

 his drawings (Diesing 1856, PI. VI, figs. 15-20) show but little more 

 than external features and the cirrus pouch. It seems to the writer 

 however that this species should be considered as belonging to the genus 

 Proteocephalus and that it is a species inquirenda. Montieelli (1891) 

 and Riggenbach (1896) included this species in their groups of fish 

 cestodes the most of which are now included in the genus Proteocepha- 

 lus. 



Diesing's original species description (Diesing 1850:514) is here 

 quoted : ' ' Taenia macrophalla Diesing. Caput rotundatum depressum, 

 acetabulis anticis maximis. Collum nullum. Articuli supremi, sub- 

 quadrati, subsequi oblonge-quadrati, ultimo longissimo rotundato. Aper- 

 turae genitalium marginales. Penes alterni longissimi filiformes. Long. 

 1-3' " ; latit.yg' ". 



" Habitaculum. Cichla monoculus, Junio, Julio et Octobri in Bra- 

 silia (Natterer: in intestinis. M. C. V.) 



"b. Os limbo elevato, uncinulorum corona interdum decidua 

 armatum. ' ' 



PROTEOCEPHALUS NEMATOSOMA (Leidy) sp. inq. 



1888: Taenia leptosoma Leidy 1888:169, (nee Diesing) 



1891: Taenia nematosoma Leidy 1891:410-418 



1891 : Taenia somatolepta Montieelli 1891 



1911: Proteocephalus nematosoma ha, Une 1911:475 



In May 1888 Leidy reported thus on the "Parasites of the Pick- 

 erel". 



"Dr. Leidy remarked that among the numerous parasites which are men- 

 tioned as infesting the pike, Esox lucius, of Europe, no Taenia is indicated. In 

 the Pickerel, Esox reticulatus, brought to our market, a species of the latter ap- 

 pears to be common. In two fishes he found half a dozen in the intestine and 

 stomach; and in another a single individual two feet in length. It resembles 



