152 



ILLINOIS BIOLOGICAL MONOGRAPHS 



[152 



Type : Alcoholics No. Ha89a and slides from the same lot. Co- 

 types :— Ha 10 a ; Ha 10 e ; Ha 29 a ; Ha 30 h ; Ha 77 a, b, e ; Ha 94 

 e, h, and slides of Ha 94 h, in Dr. H. B. Ward's Collection. 



Leidy (1886:62-63) found some specimens of a cestode in Amia 

 calva from North Carolina. These specimens, he thought, might be 

 Taenia filicollis Rud. His specimens, judging from his data probably 

 belong to the species P. perplexus but since Leidy published no draw- 

 ings of his specimens no positive determination can be made. That 

 part of his report containing his data is here quoted : 



"The worms accorded with the description of the Taenia filicollis, infesting 

 Sticklebacks, Gastcrosteus, and is probably the same species. They range from 

 1^2 to 3 inches long, gradually widening from the delicate thread-like neck to the 

 posterior rounded extremity, where they measure from i to 1.5 mm. wide. The 

 head is spheroidal, variably broader or longer, and about 0.625 mm., with the 

 summit slightly prominent and unarmed and with four hemispherical, lateral both- 

 ria 0.25 mm. in diameter. Neck variable, when extended long and narrow and 

 usually about half the width of the head. Anterior segments, transversely linear, 

 about an eighth the length of the breadth, gradually becoming inverted saucer- 

 shaped or scutellate, and about one-fourth the length of the breadth. Posterior 

 segments more quadrate, slightly widening behind, about 0.75 mm. long and from 

 1 to 1.5 mm. broad; last segment longest and rounded. Genital apertures mar- 

 ginal." 



La Rue (1911:478-479) briefly described this species and gave it 

 the name Proteocephalus perplexus. The specimens upon which this 

 species is based were collected at Havana, 111., June and July 1910, by 

 Dr. H. B. Ward. The hosts Amia calva and Lepisosteus platostomus 

 were caught in the Illinois river at that place. Four Amia were exam- 

 ined, three were infested with 30,10 and 15-20 specimens of P. perplexus 

 respectively. One was uninfested. Eight gars were examined ; three 

 were infested with 6, 3 and 5 specimens of P. perplexus respectively. 

 Five of the gars were not infested with this species. In all the Amia 



