333] 



PSEUDOPHYLLIDEA FROM FISHES— COOPER 



45 



Two vitelline ducts, each 6ju in diameter; vitelline reservoir 25 to 55/*; follicles 

 spherical or elUpsoidal in shape, 8 to SOfx. in diameter, very nimierous and closely 

 crowded. Ootype 20/i in diameter; shell-gland irregular in shape, poorly 

 developed. Uterine duct enlarged proximally with few coils, smaller distally 

 and more coiled, median, 25 to 55/x in diameter; uterus-sac elongated, filling 

 most of the medulla when gravid; uterus opening a small median elongated slit, 

 situated near the posterior end of the sac. 



Eggs, 60 to 70 by 40 to 43^. 



Habitat: In the intestine of Amia calva L. 



T3T)e specimen: No 33.1 in the writer's collection. 



Co-types: Nos. 33.2 and 33.3 of the same, in the collection of the University of Illinois 



In a preHminary paper on the systematic position of this species the writer 

 (1914:1) described the scolex as ". . . unarmed, although the edges of the 

 terminal disc and auricular appendages of both scolex and anterior proglottides 

 are provided with very minute spines. Bothria, two shallow depressions on 

 the dorsal and ventral surfaces, very simple in structure, " and In the detailed 

 description which followed (1914a) the organ was dealt with as follows (p. 82): 

 "The scolex is quite small, simple externally, and with the unaided eye can 

 scarcely be distinguished from the first joints. It is shaped roughly like a 

 rectangular solid, hollowed out laterally to form simple depressions and dorso- 

 ventrally the shallow bothria or organs of attachment. The summit is some- 

 what prolonged as a low pyramidally-shaped disc, quite comparable to that 

 ("Scheitelplatte") found in the members of the subfamily Triaenophorinae 

 Luhe 1899. . . . The opposite end of the scolex is modified to form two 

 pairs of auricular appendages closely resembling internally as well as externally 

 those of the foremost joints. " Furthermore, in both papers it was emphasized 

 that the scolex differs little in structure, apart from the nervous and excretory 

 systems, from the first segments, and that the simple bothria seem of little 

 fimctional importance as compared to those of other species while the auricular 

 appendages of both scolex and foremost joints with their borders of minute 

 cuticular spines probably act as accessory organs of attachment. Since then 

 the latter view has been rendered still more highly probable, altho as yet no 

 observations have been made on the living worms in their relation to the wall 

 of the host's intestine, by the discovery that the so-called scolex (Figs. 9 and 

 10) is not in reality the scolex but only a slightly modified anterior segment. 



The true scolex is somethmg quite different from anything present in the 

 whole order so far as the writer is aware. As shown in figures 43, and 44, it con- 



