470 MICHAEL F. GUYER, 



material, which was poorly ijreserved for histological purposes, woukl 

 perinit. In the following descriptioii of the structure of the new worm 

 no great amount of histological detail is given for the reason already 

 stated^). Two specimeus ouly, were obtaiiied; the one eiitire aiul 

 the other, unfortunately, lacking the head. The last mentioued has 

 been largely used up in making sections, the other remains intact in 

 the private collectiou of Dr. Henry B. Ward. 



Because of the ease with which speciniens of Taenia saginata 

 raay be secured for study, and also on aecount of the more al)iindant 

 supply of literature describing this species, the new form has been 

 compared priucipally with it although in many such as the general 

 delicacy of structure, the small head, and the branching of the uterus, 

 there is more of a similarity to Taenia soUuni. In the minute details 

 of structure, however, it i'esembles neither. 



General structure. In general the form is from 5 to 8 ra 

 long, consisting of a very small head and between 700 and 800 pro- 

 glottids. The proglottids are, with very few exceptions, longer than 

 broad (Fig. 1) ; this being especially charactoristic of the terminal 

 ones (Fig. 1 / ), which measure in sorae cases, as much as 35 mm 

 long by only 4 or 5 mm broad. At no tirae do they have the pecu- 

 liar pumpkin-seed shape, so characteristic of the terminal proglottids 

 of T. saginata. The uterus, in the ripe proglottids (Fig. 2) cousists 

 of a median stem with from 14 to 18 irregularly branching offshoots, 

 which in general appearance often resemble somewhat the branches as 

 Seen in T. solium. The sexually mature Segments (Fig. 1 c) are 

 longer than broad and are characterised particularly by the long 

 kidney-shaped lobes of the ovary (Fig. 3 o). The whole body is in 

 general much thinner and more fragile than that of T. saginata. 

 The eggs (Fig. 11) are oval in shape, 39 /< long by 30 {.i wide, of a 

 white color and without a pyriform apparatus. 



In the following detailed aecount, the description of the internal 



1) To Dr. Henry B. Ward, my highly esteemed instructor, I am 

 greatly indebted for bis kindly aid and valuable suggestions. Not only 

 has he supplied me with literature from bis owu library, but also, with 

 very valuable material for study and coraparison from bis private col- 

 lection, to which, in fact, the specimens under discussion belong. His 

 wide acquaintance with zoological literature, and his familiarity with the 

 special methods so essential to a successful pursuit of this kind of re- 

 search work, have been of inestimable Service to me. 



