TAPKWORM FIfOM APTP]RYX. 87 



are T. echinococcus, which reaches only a length of 5 mm.; 

 T. acanthorhyncha, Wedl, from Podiceps nigricollis- 

 and Davanica proglottina, Dav., from the fowl^ which 

 does not exceed a millimetre in length : all these have but a 

 few proglottids. But from each the present species differs in 

 various ways. From D. proglottiua, with which it has 

 some apparent affinity, it differs in that the suckers are not 

 provided with hooklets. 



The peculiar flap to the sucker seems to be quite unique 

 amongst the family T^eniadae sensu lato; nevertheless it 

 faintly recalls the condition seen in the fish Cestodes, Pros- 

 thecocotyle Forsteri, Krefft, and Marsipocephal us 

 rectangulus, Wedl, both of which belong to the family 

 Teti-abothrida3 (order Tetraphyllidea). From Bronn's figures 

 it appeal's that in the former species there is a small muscular 

 wing arising from the outer margin of the sucker distally. It 

 is represented (Bronn, pi. xliv, fig. 2) as projecting into the 

 sucker. The representation of the other species is not very 

 distinct (pi. xlv, fig. 15), but there appears to be a kind of 

 flap springing from the lower (distal) margin, as in the species 

 from Apteryx. As far as I can discover from all the general 

 literature, one of the characters of theTasniada^ sensu lato, is 

 that the hemispherical sucker has not projecting mobile mar- 

 gins. The two species herein described appear to contradict 

 this statement. 



II. Drepanidotaenia apterygis, n. sp. 



The tapeworms from the intestine are altogether larger 

 than those in the duodenum, and are evidently a different 

 species. 



They measure some 3 to 4^ inches in length, and about 

 ■i inch across the terminal proglottids ; the scolex, however, 

 is only about g^^- inch across, so that the worm gradually 

 widens posteriorly (fig. 9). The strobila consists of some 

 300 proglottids, most of which (about 200) are of the same 

 short length, whilst beyond this point they become gradually 



