412 REVISION OP THE MONAXONID SPONGES, iii., 



due to carelessness of observation ; and hence I decided to accept as 

 correctly labelled the ostensible specimens of Echinonemd\ levis 

 and E. rubra, and to reject as bogus those of Clathria macropora 

 and C. australis. It is now my opinion that the descriptions of 

 E. levis, E. rubra, and perhaps also Clathria australis combine 

 each a description of the outward characters of one species with 

 one of the inward characters of another — the former of which 

 species is alone represented by the specimens; and that the chief 

 ground of my rejection of the specimens labelled 'C'Zof^/^r/a macro- 

 pora — namely, the unlikeliness of Lendenf eld's having mistaken 

 for oscula, holes produced by crustaceans — is untenable, inasmuch 

 as such mistakes actually have since been found to have been made 

 by him in connection with Cliona Jiixoni, C. lutea, and apparently 

 also Tedania rubra. Consequently, as synonyms of the sponge 

 which I described in my previous paper as Crella incrustans var. 

 levis, I would now write Clathria macropo7'a, Echinoiiema levis 

 (? pars), and Echinonema rubra ( ? pars); and should a Port 

 Jackson species possessing the skeletal characters ascribed by Len- 

 denfeld to Echinonema levis prove to be existent, I think it would 

 be preferable to give to the former sponge the name Crella incrus- 

 tans var. macropora, and to employ the specific name levis for the 

 latter. 



Those of the remaining species not yet identified are : Clathrissa 

 elegans, Clathriodendron irregularis, Plectispa macropora (the 

 type of Plectispa), P. elegans, Thalassodendron typica{the type of 

 Thalassodendron) , T. digitata, and, lastly, the three which through 

 some misconception Lendenfeld described as varieties of Echino- 

 nema anchoratum Carter. The last mentioned are nominally re- 

 presented in the Australian Museum by specimens which, while 

 labelled with the names that the key-list indicates to be the MS. 

 synonyms of their published names, accord neither in external nor 

 internal features with tlieir descriptions; — the variety ramosa being 

 represented by an imperfect example (labelled "Ceraospina arbus- 

 cula") of Clathriodendron arbuscula, and the two varieties dura 

 and lamellosa by specimens (labelled " Antherospongia dura" and 

 ^^Ceraospina flahelluni") of the species which(18) I have named re- 



