ON A NEW REPTILIAN CESTODE. 105 



posterior border of the preceding one, nor is there any 

 indentation marking their line of junction except in the 

 sexually mature region of the chain. Even here the con- 

 strictions are slight. In egg bearing proglottids the 

 separation is somewhat more marked. Segmentation is 

 recognisable in cleared specimens, by the presence of 

 delicate transverse septa which divide adjoining members 

 of the chain (fig. 2). Young segments are very uniform in 

 size, being 0*14 mm. long by 0*2 mm. broad, gradually 

 increasing in width to 0*27 mm. The increase in size is so 

 gradual that at a distance of twenty-five millimetres 

 behind the scolex, they are only 0*48 mm. long by 0*34 

 mm. broad. There is a rather sudden increase in size 

 when sexual maturity is reached ; such segments being 

 about a millimetre in length, the width scarcely altering 

 i.e. 0*36 mm. (fig. 3). Egg-bearing proglottids may be as 

 much as 2*5 mm. long and only 0*45 mm. broad. Hence 

 there is no narrowing in ovigerous segments, nor is there 

 any marked widening in those which are sexually mature. 

 Ripe members of the strobila resemble elongated ellipses, 

 their anterior and posterior margins being rounded off, and 

 consequently segmentation is here quite distinctly shown. 

 Although I examined a large number of specimens, ripe 

 segments were quite uncommon. Some of the worms 

 possessed abnormal proglottids of irregular shapes and sizes. 

 They were apparently sterile and showed distinct segmen- 

 tation. 



The cuticle bears characteristic structures. Its surface 

 is raised into tiny, backwardly directed spines, which are 

 so numerous as to give the surface the appearance of having 

 been finely stippled (fig. 1). One needs to examine the 

 margin of the worm to see the spines in profile. They are 

 so minute as to require the use of a high power of the 

 microscope for their detection. It is on the scolex and 



