391] 



PSEUDOPHYLLIDEA FROM FISHES— COOPER 



103 



The following table gives a list of measurements of representative speci- 

 mens in alcohol: 



♦Somewhat stretched during fixation. 



Since Lonnberg (1891:52) described the cuticula of the species there has 

 been no mention of it in the literature, so far as the writer is aware. It was 

 found to be 5m in thickness and composed of two layers, the outer of which is 

 about two-fifths of the whole thickness and is made up of rather stout, closely 

 set "cirri" which stain much more readily than does the inner more homo- 

 geneous and lighter layer. These cirri seem to he on a distinct membrane since 

 their proximal (central) ends are all even and distinguishable in some places 

 as dark granules. In sections stained more deeply than those which show the 

 inner layer as a single homogeneous stratum, the latter is divided into two 

 layers, the outer of which is less deeply stained than the inner and about one- 

 half as thick or one-fifth of the thickness of the whole cuticula. The wavy 

 nature of the cuticula and the basement membrane is as described by Lonnberg, 

 but in many places the membrane is separated from the cuticular musculature 

 by a very thin clear space barely distinguishable with high powers. The 

 cuticula covering the scolex is about 4ju thick, the difference between it and 

 that over the proglottides being due to a thinner homogeneous stratum. The 

 outer layer of the cuticula is not modified to form spinelets on the posterior 

 borders of the proglottides, nor on the edges of the terminal disc, as in C. crassi- 

 ceps, but the pseudociha are somewhat longer and relatively stouter on the 

 scolex and anterior segments than elsewhere. 



The subcuticula, from 25 to 30/i in thickness, has the nuclei of its spindle- 

 shaped cells arranged at various levels so that the space between the cuticula 

 and the vitelhne follicles is, excepting for its outer one-third, well filled with 

 them (Fig. 84). 



The chalk-bodies, described by Lonnberg, were not studied in Hving mater- 

 ial; but spherical spaces which were evidently occupied by them before they 

 were dissolved out by the acetic acid of the fixing agent, were found to be more 



