BY T. HARVEY JOHNSTON. 59 



do Tint project to any degree when viewed dorsoventrallj-, but in 

 a specimen seen in end-view, tlie four suckers wei'e seen to occupy 

 the (Hagonals of the scolex, which here appeared in section to 

 resemble a square with tlie corners rounded off. Wlien examined 

 laterally, these organs are seen to project prominently. 



.S'<?-o6t/rt .—Segmentation is faintly recognisable at (>3 12 mm. 

 from the anterior end, the portion between this point and the 

 head constituting a short unsegmented neck. The transverse 

 septa separating adjacent proglottids are visible just behind this 

 neck, and a short distance further back (0-6 mm. from the anterior 

 end), the divisions may be recognised marginally by the pi-esence 

 of small indentations. In this part of the strobila the segments 

 are about 0-174 nnn. broad, by 0-052 mm. long, the ratio of. 

 breadth to length being about 3:1. The posterior edges are here 

 well rounded. In front of this the ratio is 4:1. The .segments 

 increase gradually in width and considerably in length, the pos- 

 terior edges becoming obtusely serrate. Well-developed genitalia 

 appear in proglottids with a breadth of 0-71 mm., and a length 

 of 0-45 mm., the ratio here l^eing 8:5. The length continues to 

 increase out of proportion to the breadth. In ripe segments the 

 breadth is about 1 mm., the length 2-4 nun., the ratio now being 

 1 :2-4. The linal proglottids are only slightly connected with each 

 other and readily separate. The anterior end is "broadly rounded, 

 the widest part of the segment now being anterior, just at about 

 the level of the genital pore. Then there is usually a gradual 

 narrowing, followed at the posterior end by slight widening. 

 Some segments .showed a considerable thickening at this end, due 

 to the presence of a mass of muscle which is perhaps functional 

 in accelerating their abstriction. Another fact worth noting is 

 that the final segments are very thin, flat and semi-transparent. 



6'ea:o/>em?tgrs .-— These altei-nate irregularly, the sequence in a 

 typical part of the chain being Jj,L, K,R,R,R,L,L,II,R,K,L. The 

 pore may or may not be located on a definite genital ennnence. 

 Its situation is marginal and anterior, being at or near the junc- 

 tion of the first and second fourth of the lateral margin. There 

 is frequently a slight depression of the segment-edge, leading into 



