432 REVISION OF THE MONAXONID SPONGES, iii., 



not necessary, to retain the family Tedaniinae, though, at present, 

 I am unable to form an opinion as to whether it should be placed 

 under the Haploscleridce or the Desmacidonidce. A very con- 

 siderable resemblance certainly exists between Trachytedania 

 and certain Myxilline genera like Lissodendoryx, but inasmuch 

 as no form of spicule, affording evidence of an homology with 

 the onycheta, is known in any of these genera, there is no suffi- 

 cient warrant for regarding the resemblance as other than the 

 result of convergent evolution. 



Hemitedania anonyma Carter. (PI. xviii., fig.4; PL xix., figs. 1-5; 

 PI. xxiv., figs. 3-5; and text- fig. 20). 



1886. Amorphina anonyma', Carter(7), p. 49. 



1895. Rhaphisia anonyma; Dendy(12), p. 2 5 6. 



\^'6S. Renter a pand(ea{^3iYt\m); Lendenfeld(27), p. 79. 



. HalichoTidria ?'?fc6?-a(partim); Lendenfeld(27), p.81. 



. Halichondria rubra var. diyitata{^3iYt\m); Lendenfeld(27), 



p.81; not PI. ii., fig.\{ = Raspailia agminata, sp.n.), 

 1901. Rhaphisia rubra; Whitelegge(54), p 77. 

 IQO'2. Rhaphisia pandcea; Whitelegge(56), p. 281. 



The material at my disposal comprises some twenty specimens 

 from Port Jackson and neighbouring localities; a specimen from 

 Port Phillip; and a slide-preparation of Rhaphisia anonyma, pre- 

 sented to the Australian Museum by Prof. Dendy. 



Description. —In the simplest form, the sponge is an irregu- 

 larly digitate cluster of stout branch-like parts (PI. xix., figs. 1-4), 

 which are united below, forming a sessile base; the branches are 

 tubular, with a single osculum at the summit, are cylindrical 

 and slightly tapered, may attain to a length of 200 mm or more, 

 and, while ordinarily not much less than 20 mm. in diameter, 

 vary in stoutness in different specimens from 10 to 30 mm. More 

 usually, however, a formation into separate tubes is only partially 

 effected, and the sponge accordingly consists, in part, of more or 

 less flabellate portions with marginal oscula (PI. xix., fig.5). 

 Finally, the branching habit is often almost entirely suppressed, 

 and the sponge is then lobose, semi-massive, as a rule more or 

 less compressed, with the oscula situated on the uppermost and 



