34 DR. F. E. BEDBARD ON 



It should be mentioned that the egi^s were not in any way 

 aggregated into balls such as I have described in the species 

 IchthyoUenia varia. 



I have finally to point out that although I have not come across 

 any description of external uterine pores in any Oyclophyllidean, 

 Spatlich* has described and figured in Tetrahothrium & cov^ oi 

 cells passing from the uterus which may well be, as he suggests, 

 the remains of an external duct and pore. This comparison gains 

 some additional force by other points of likeness between Ichthyo- 

 tcenia and Tetrabothrium insisted upon by Lonnberg t. 



§ On the Genera of the Family Ichthyotceniidae. 



Having surveyed the anatomy of a number of worms un- 

 doubtedly referable to this family of Tapeworms, it remains to be 

 seen how they should be placed in gen^ia, whether in more than 

 one genus. 



Relying mainly upon variations in the scolex and its suckers, 

 Braun J, in 1899, allowed three genera — viz., Ichthyotcenia, 

 Gorallohothrium, and Crejndohothrimn. Braun does not accept 

 Lbnnberg's § view that Tetrahothrium should be included in the 

 same family ; neither does Ransom in his review of the Cyclo- 

 phyllidea li, nor Flihrmann^ in. his well-known essay upon the 

 Cestodes of Birds. It appears to me, however, that Lonnberg's 

 Telrabothrmni trionychiiom is not congeneric with other species 

 referred to that genus. It has, in fact, the peripherally situated 

 Vitelline glands of Ichthyotcenia, with which it also agrees in its 

 alternating genei'ative pores. In Tetrahothrium ** the genera- 

 tive pores are unilateral and the vitelline gland ft lies in front 

 of the ovary. 



While, therefore, there are certain points of agreement between 

 Tetrahothriwm and Ichthyotcenia, I do not think that they can be 

 j)laced together so closely as would be implied by union in so small 

 a subdivision as a Cestode family. Linstow JJ gave the name 

 of Acconthotcenia to a small Ichthyotceniid from Vccranus scdvator, 

 which name was also accepted by Johnston §§ in his account of a 

 worm of the same genus from Varanus varius. This generic u;une 

 is perhaps hardly accepted by Schwarz JUi in his recent monograph 

 upon reptile Ichthyotseniids. But the last-named author has 



* Z( ol. Jahrb. xxviii., 1909. 



t Centralbl. Bakt. u. Paras, xv. 1894, p. 801. 



X 111 Bronn's ' Klasseii und Ordnungeii des Tliierreiclis,' Bd. iv. p. 1706. 



§ Tjoc. cit. 



II "The T«nioid Cestodes of North American Birds," Bull. U.S. Nat. Mus. 

 no. 69, 1909. 



^ " Die Cestodon der Voa;cl," Zool. Jalirb. Suppl.-Bd. .x., 1908. 

 ** Spatlich. " Studien iiber Tetrabothreeii," Zool. Jalirb. xxviii. 1909 ; and generic 

 diagnosis of Ransom. 



+t Spatlich, Inc. rit. Taf. 28. fig. 25, dsf. 



tt Centralbl. Bakt. u. Paras, xxxiii. 1903, p. 534. 



§§ Proc. Roy. Soc. N. S. W. 1909. 



jjj "Die lchth.yot;eiuen &c.;' Inaug.-Diss., Basel, 1908. 



