REPTILIAN TAPEWORMS. 5 



the species infest those vertebrates. Two species, however, viz. 

 /. schultzei * and /. loiinbergi f, have been met with in amphi- 

 bians — the former in Rana adspersa, the latter in Necturus. The 

 other members of the genus are known to inhabit reptiles, both 

 snakes and lizards, and, if we allow Tetrahoihrium trionychmm %. 

 to be of this genus, tortoises. 



§ So7ne Species o/" Ichthyota3nia (Acanthotaenia) y^rom 

 Monito7' Lizards. 



Our knowledge of the parasites of Monitor 'Lizards is obviously 

 not very extensive at present, for very few species of these lizards- 

 have been examined or at any rate have yielded parasites. These- 

 have been referred to five genera, viz. Duthiersia, Scyp)hocephalus 

 (both of which are Bothriocephalids), Fancerina, Palaia, and 

 Ichthyotoinia (including Acanthotcenia). With the two first- 

 named genera I do not concern myself in the present communi- 

 cation. The name AcantJiotcenia, whether necessary or not, was 

 apparently given by v. Linstow under a misconception of the 

 structure of the worm of which he gave an account under the 

 name of '■^Acanthotcenia shipleyi, nov. gen. et sp.'"' §. In my 

 opinion it was probably by rea,son of having not seen the peri- 

 pherally situate vitelline glands, and of having Avrongly termed 

 the ovaries vitelline glands, that v. Linstow created the genus,, 

 rather than by virtue of the densely-set spinelets iipon the scolex,. 

 though the latter clearly suggested the name. Two worms from 

 another sj^ecies of Varanus had been previously (in 1900) described 

 by V. Ratz |! as members of the genus Ichthyotcenia ; and thi& 

 name is retained by Schwarz %, who, however, was apparently 

 unacquainted with v. Linstow's paper, which is not quoted in his 

 list of literature. Finally, at about the same time as Schwarz, 

 T. H. Johnston** described under the name of AcanthotcBnia 

 a fourth species from Varanus varius. So far as I am aware^ 

 this exhausts the species of Ichthyotcenia which have been 

 recorded from lizards of the genus Varanus. 



It appears to me to be probable that Falccia varani, a new- 

 species and genus described by Dr. Shipley tt from Varccnus indicus, 

 is also to be referred to this genus Ichthyotcenia. It is true that 

 Johnston, in his memoir upon Ichthyotcenia [Acanthotcenico) tidsivelli, 

 is not of that opinion ; there are, however, certain reasons which 

 seem to be favourable to its inclusion within the present genus. 



* Huiigei'tuliler, Jen. Denkschr. 1910. 



t Fuhrmaim, " Die Tsenien der Ampbibieii," Zool. Jalirb. ix. Anat. 1896. 



J Loiinbei-ff, " Ueber eine iieue Tetrabothriumspecies, &c.," Centralbl. Batt. u. 

 Paras, xv. 1894. 



§ Centralbl. Bakt. u. Paras, xxxiii. 1903, p. 53i. 



II Centralbl. Bakt. u. Paras. 1900 ; C.R. Soc. Biol. 1900; Arch, de Paras, iv. 1900. 



^ " Die Ichthj'otjenien der Reptilien, &c.," Inaug.-Diss., Univ. Basel, 1908. For a 

 cnpj' of this I am greatly indebted to the author. 

 ** "On a new Reptilian Cestode," Proc. Uo\. Soc. N.S. W. vol. xliii. 1909, p. 103. 

 ft Description of Entozoa &c. in Willey's ' Zoological Results,' Cambridge, 1900. 



