232 Miss Jane Stephens on 



The two species which can at present be assigned definitely 

 to this genus may be distinguished thus : — 



1. Head not retractile within a cuticiilar sheath. 



CEsophagus long (one-seventh to one-fourth 

 of the total length). Vulva situated within 

 the last quarter of the total length. Parasitic 

 in Varanus and other semi-aquatic reptiles in 

 Africa, the East Indies, and Australasia .... T. tiara (v. T^inst.). 



2. Head retractile within a loose cuticular sheath. 



CEsophagus comparatively short (about one- 

 eleventh of the total length). Vulva in the 

 middle third of the body. Parasitic in semi- 

 aquatic reptiles in South America T. diadema. 



A table of measurements is given on p. 231, including, for 

 the sake of completeness, these two species and the more 

 doubtful T.anomala. Tiie measurements given by von Lin- 

 stow (1904) for T, tiara are placed beside my own for com- 

 parison. A certain amount of Viiriation was found to exist, 

 and for tiiis reason measurements derived from the three 

 sets of specimens studied are given side by side. 



References. 



BL.\xcH.\i''n, K. 1904. " Tanqua, n. g., rempla^ant Ctenocephahis 



von Liustow." Arch. Parasitol. viii. p. 478. 

 Lkipek, R. T. 1908. "Hehninthes contained in Dr. C. M. Wenyon's 



Collection from the Sudan." liep. Wellcome Kes. Lab. Kharloum, 



iii. p. 187 (published 1909). 

 LiNSTOW, O. VON. 1879. " Ilelminthologische Untersuchungen." 



"Wiirttemb. Naturw. Jahresh. xxxv. p. 313. 

 . 1904. "Nematoda in the Collection of the Colombo Museum." 



Spolia Zeylanica, i. p. 91. 

 Pahona, C. 1898. " Elminti raccolti dal Dott. Elio Modigliani alle 



isole Mentawei, Engano e Sumatra." Ann. Mas. Geneva, (2) xix. 



p. 102. 



XX. — Preliminary Notice of some Irish Sponges. — 2/ie 

 Mojia.vonellida {Suborder Si(fmatonio7iaxonellida) obtained 

 by the Fisheries Branch of the Department of Agriculture 

 and Technical Instruction, Ireland. By Jane IStepiiens, 

 B.A., B.Sc, Irish National Museum. 



The following list of sponges belonging to the suborder 

 Sigmatomonaxonellida, Dendy, contains ninety-five species. 

 Fifty-one of the species are now recorded for the first time 

 within the Irish area, and of these tliirty-one have not been 

 t;dven previously off any part of the British Isles. 

 Thirteen species are described as new. 



