343] 



PSEUDOPHYLLIDEA FROM FISHES— COOPER 



55 



As shown in the appended table where the largest specimens at hand are 

 dealt with, this species is considerably smaller than the European species 

 which ranges from 6 to 40mm. in length by 1 .5 to 4 in width. Linton gave these 

 measurements as 7 and 1.2mm. 



The general shape of the body, however, is the same, as are the proportions 

 of the scolex and proglottides. The border of the infundibuliform scolex 

 (Fig. 11) is thickened and almost constantly rolled backward slightly as in the 

 figures given by Zschokke (1884a, Fig. 9) and Kraemer (1892, Fig. 5). The 

 funnel is about 0.22mm. in depth, and is usually filled with a plug of mucous 

 membrane from the host's alimentary tract. The posterior limits of the 

 scolex are difficult to define since the organ gradually narrows down and then as 

 gradually enlarges again to form the neck. The latter is considered to include 

 that portion of the anterior end of the worm between the narrowest region 

 behind the scolex and the first vitelline follicles which are situated some dis- 

 tance ahead of the first cirrus-sac. The maximum breadth of the strobila is 

 at the posterior end of either the first third or one-half. The segments are as 

 described by various writers for C. iruncatus about twice as broad as long, the 

 last one, however, being rounded posteriorly and provided with a notch in the 

 middle which accommodates the exit of the excretory vesicle. They are, 

 furthermore, closely united, as pointed out by Linton (1898:429) when he said 

 "The bodies of these specimens appear to be unsegmented, or, at least, 

 with only very faint indication of division into segments." As a matter of 

 fact numerous transverse wrinkles present in most specimens make it almost 

 impossible without the external evidences of the inner genitalia to distinguish 

 the limits of the proglottides. And in this respect they agree with C. truncatus, 

 since Zschokke (1884:38) said concerning the segments: "lis sont solidement 

 fixes les uns aux autres, leurs limites sont difficilement visibles. " The follow- 

 ing table gives the measurements of four of the largest specimens studied: 



The cuticula is 5/j, in thickness over the scolex as well as on the segments, 

 and is divided into two layers, the outer of which is about one-half as thick as 

 the inner and more or less irregular in structure. However, no such chitinous 

 hooks as described by Kraemer (1892 :10) for the cuticula of the lateral borders 

 were seen, but the whole tissue is freely pierced with numerous foramina 

 secundaria of the excretory .system, which in C. truncatus Kraemer considered 



