n\ T. WAUVKV .lOIINSION. ") I 



known, but ap])ears to be about seven centimetres, the 

 greatest width (which is at the end) being 1-62 mm. 



The scolex is very small, its maximum breadth only reach- 

 ing 0-210 mm. The anterior end is a truncate cone, the 

 summit of which bears a retractile rostellum, whose full 

 length is about Oil mm., and its breadth 0-25 mm., the free 

 extremity being expanded into a low cone of 0065 mm. broad, 

 bearing a double series of hooks. In Fig.l, the organ is seen 

 to be partly retracted into its muscular sac. There are about 

 sixteen hooks, their length reaching about 0028 mm. The 

 dorsal root is long and narrow, the ventral root being short, 

 and the claw long, thin, and well curved (Fig. 8). 



Situated on the broadest part of the scolex are the four 

 suckers, whose diameter is 0080 mm., the openings being 

 laterally and slightly anteriorly. Behind these organs, the 

 head gradually narrows into the unsegmented neck-region, 

 which extends for a distance of 0-56 mm., behind the suckers. 

 The narrowest portion is only 0105 mm., and is just at the 

 point of the commencement of segmentation. 



The strobila consists of very numerous proglottids, whose 

 size and form vary considerably in different parts of the 

 chain. Just behind the neck, their length is 0032 mm., and 

 the breadth 0130 mm., the ratio being 1:4. The posterior 

 margins scarcely project in this portion (Fig.l). Further 

 back the form becomes considerably altered, the length being 

 016 mm., the breadth at the anterior end of the segments 

 008, and at the posterior margin 013 mm., the ratio now 

 being nearly 4:3. The margin of the strobila is here strongly 

 serrate, and the segments scarcely overlap (Fig. 2). More 

 posteriorly the form is again altered, the proglottids now 

 becoming more quadrate and relatively shorter, and the 

 hinder margin less projecting, the ratio of length (0081 mm.) 

 to breadth (0-178 mm.) being under 1:2. The lateral mar- 

 gins are here convex (Fig. 3). Beyond this, the segments 

 become much wider (0-534 mm), and overlap to a very con- 

 siderable degree, more than one-third of each being over- 



