ON DIIEPANIDOT/ENIA HEMIGNATHl. 613 



On Drepanidotsenia hemignathi, a New Species 



of Tapeworm. 



By 



Artliiir E. i^hipley, 



Fellow and Tutor of Christ's College, Cambridge, and Uuiversity Lecturer m 

 the Advauced Morphology of the luvertebrata. 



With Plate 46. 



The specimens of the above-named tapeworm, of which I 

 received but ten, are all small; they vary in length from 

 10 mm. to 22 mm. The head is very small ; immediately be- 

 hind it, there being practically no neck, the body begins to 

 broaden out, and in some specimens the proglottides attain a 

 width of 2 mm. The segmentation of the body commences 

 immediately behind the head, and is very well marked a little 

 further back. The posterior border of each segment overlaps 

 the succeeding one with a prominent edge or rim ; this is well 

 shown in longitudinal section (fig. 6). The number of seg- 

 ments varies from some fifty to sixty to over a hundred. The 

 measurements given above are about the average, but, as is 

 well known, tapeworms are extremely extensible animals, and 

 this to a great extent diminishes the value of figures quoted in 

 reference to their size. In some specimens the body is 

 stretched, and the length of the segments equals one half or 

 even two thirds of their breadth, but in the commoner forms 

 the segments are very short and broad, sometimes eight or ten 

 times as broad as long. They are flattened, as is seen in trans- 

 verse section, and sometimes, especially towards the posterior 



VOL. 40, PART 4. NEW SEE. U U 



