BY T. HARVEY JOHNSTON, M.A., D.SC, F.I,.S. 77 



measure .07 mm from th(^ tip of the claw to the dorsal root. 

 Those of the other set are .45 mm long, and haw a differ- 

 ent shape, the claw being shorter and more strongly cur- 

 ved. They more closely resemble those described from 

 species of Biuferina than do the anterior hooks. The 

 dorsal and ventral roots are considerably thickened in both 

 sets. 



StrobUa — An unsegmented neck is absent. Imme- 

 diately behind the scolex, proglottids measure nearly .2 mm 

 in width, and though short, are quite distinct. Sexually 

 mature joints are about .13 mm in length and .3 mm in 

 maximum breadth. They gradually become relatively 

 longer, until their dimeneious are about .4 inm and 

 .5 aim lespectively. Mature segments, found free in 

 the intestine, were about .75 mm long and .7 mm wide, 

 their shape being that of a triangle with the apex removed. 

 The large egg capsule occupies the apical region, unless it 

 has been already extruded. The postero -lateral edges 

 of older segments project freely. The amount of over- 

 lapping is small. 



Genital pores alternate irregularly and lie marginally 

 just in front of the middle of the proglottid. There 

 is a genital cloaca. Only rarely can a genital papilla be 

 seen. 



Calcareous corpuscles of at least two kinds, large 

 and small, are to be found in the cortex. The former, 

 which are rare, are somewhat disc-shaped with radiating^ 

 depressions on the surface, and may measure as much as 

 .02 mm. The smaller ones are fairly common and possess 

 the usual rounded or elliptical outline. They measure 

 about .007 -.008 mm by .005-. 004 mm. 



The longitudinal musculature is airanged m two 

 concentric series of rather large bundles, the individual 

 bundles, as well as the series, being close to onj another. 

 Transverse fibres are to be seen occasionally in sections, 

 their position being internal to the longitudinal series. 



The ventral excretorj^ canal is relatively very wide,, 

 the small dorsal vessel being directly alcove it. The 

 latter has a more sinuous course than the former. A 



