232 Miss Jane Stephens on 



Tlie two species which can at present be assigned definitely 

 to this genus may be distinguished thus : — 



1. Head not retractile within a cuticular sheath. 



CEsophagu8 long (one-seventh to one-fourth 

 of the total lenfjfth). Vulva situated within 

 the last quarter of the total length. Parasitic 

 in Vannnts and other senii-aquatic reptiles in 

 Africa, tlie East Indies, and Australasia .... T. tiara (v. I.inst.). 



2. Head retractile within a loose cuticular sheath. 



Oesophagus 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 tlie more 

 doubtful T.anoinala. The measurements given by von Lin- 

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

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

 and for this reason measurements derived from the tlir<.e 

 sets of specimens studied are given side by side. 



Keferences. 



Bl.\nchabd, E. 1904. " Tanqua, n. g., rempla^ant Ctenocephalus 



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

 Leipeii, K. T. 1908. "Ileliuiuthes contained in l")r. C. M. Wenyon's 



Collection from the Sudan." Kep. Wellcome lies. Lab. Khartoum, 



iii. p. 187 (published 1909). 

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



Wiirttenib. Naturw. Jahresh. xxxv. p. 313. 

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



Spolia Zeylanica, i. p. 91. 

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



isole Mentawei, Engauo e Sumatra." Ann. Mus. Genova, (2) xix. 



p. 102. 



XX. — Preliminary Notice of some Irish Sponges. — 2 lie 

 Monaxonellida (^Suborder Sigmatomonaxonellida) obtained 

 by the Fisheries Branch of the Department of Agriculture 

 and Technical Instruction, Ireland. By Jane fcJTEPiiENS, 

 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 fiast time 

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

 taken previously off any part of tlie British Isles. 

 Thirteen species are fh'scribed as new. 



