406 T. H. JOHNSTON. 



The occurrence of this parasite in New South Wales has 

 already been recorded by me. 1 The length of the cestode 

 is about 30 mm. with a maximal breadth of 0*65 mm. 

 (Fuhrmann, 0*75 mm.) 



Scolex.— The scolex is comparatively small and is not 

 well marked off from the rest of strobila. If we exclude 

 the suckers, its breadth is not much more than that of the 

 neck region. If they be included, then the greatest breadth 

 is 0*15 — 0*17 mm. The four suckers are strongly muscular 

 and project slightly. Their openings are antero-laterally. 

 The diameter is about 0*08, the cavity being 0*04 mm. in 

 depth. On the anterior end of the scolex there may be 

 seen a very protractile rostellum. In the example figured 

 (fig. 1), this organ is nearly 0*11 mm. long, its swollen 

 rounded extremity being 0*04 mm. across. The latter part 

 is followed by a neck-like constricted portion (0*02 mm.) 

 which merges into the lower or basal division of the rostel- 

 lum. This appears as a considerably distended (0*08 mm.) 

 structure containing abundant muscle fibres, transverse 

 and longitudinal, the latter passing backwards through the 

 scolex between the suckers. In the state of rest, the 

 rostellum lies within the rostellar sac surrounded by these 

 protractor and retractor muscles. On the apex there are 

 about twenty small hooks placed in a double series, the two 

 rows not being very readily separable. The hooks are 

 0*016 mm. and 0*014 mm. long in each row respectively. 

 Each has a long delicate attachment and a short relatively 

 broad free part (fig. 5). Dr. Fuhrmann pointed out that 

 there is a certain similarity in the form and size of the 

 hooks to those of Taenia parvirostris as described by 

 Krabbe. 2 They seem to me to be rather more curved than 



1 Johnston, Agric. Gazette, N. S. Wales, xx, 1909, p. 584; Eec. Austr. 

 Mus., vn, No. 4, 1909, p. 344. 



3 Krabbe, Bidrag til Kundskab om Fuglenes Bsendelorme, 1869, p. 86, 

 and fig. 267. 



