361] 



PSEUDOPHYLLIDEA FROM FISHES— COOPER 



73 



corded by the same WTiter as from 25 to 78nim., while the maximum breadth 

 was 2.7mm. As shown in the table below, the largest examined by the WTiter 

 was one 110mm. in length with a maximum breadth of 3mm., which, however, 

 showed the characteristic opaque white uterus-sac filled \nth eggs in only 

 the last eight proglottides. The scolex (Figs. 4, 5) and strobila are, as 

 described by Linton, "... sagittate (when at rest and contracted), terminated 

 anteriorly with a button shaped tip [the terminal disc] which is bluntly rounded 

 in front and marked ofif from the remainder of the head by a slight constriction, 

 in life angled posteriorly; pits [bothria] variable in life but usually elliptical, 

 often with anterior margin acuminate and sometimes with posterior margin 

 indistinct. The head is angled posteriorly both laterally [surficially] and 

 m^arginally, presenting a quite characteristic appearance in the Uving worm. 

 Neck subcylindrical, narrower than the head. The segments begin some dis- 

 tance (6 or 8mm.) back of the head, as faint transverse lines. The first distinct 

 segments are closely crowded much broader than long, median segments 

 squarish [but still much broader than long], posterior segments usually a 

 little longer than broad, rectangular, apparently separating rather easily. . . . 

 Posterior angles of the segments slightly projecting. . . . Outline of most 

 of the strobilas nearly linear and about the same breadth as the head. All 

 the segments were remarkably regular in outline, no irregularities being ob- 

 served." Wliile this regularity in the form of the proglottides and in their 

 gradual increase in size anteriorly and change of shape posteriorly is especially 

 noteworthy in this species, the writer met with a few cases of intercalated tri- 

 angular and aberrantly subdivided segments in the material studied. It 

 should be emphasized, too, that the whole strobila including even the scolex 

 is constantly much flattened dorsoventrally, which also assists in giving the 

 worm the peculiar diagrammatic appearance which is mentioned below. The 

 follo\\ing table gives the measurements of four specimens, together with those 

 by Linton in the first two colums for comparison: 



