104 RECORDS OF THE AUSTRALIAN MUSEUM. 



belongs to the genus Coscinoderma, and that Thorecta farlovii, 

 Lendenfeld, is identical with Spongelia palmaia, Hyatt. 



Sub-family APLYSININ^. 



Thorecta, Lendenfeld. 



Thorecta murrayi, Poh'jaeff. 



Cacospongia murrayi, Polejaeff, Ohall. Rept., Zool., ii., 1884, p. 

 57, pi. iv., tig. 3. 



Thorecta murrayi, Lendenfeld, Mon. Horny Sponges, 1889, p. 

 347, pi. vi., fig. 8. 



A single specimen was obtained at Tuggerah Beach. 



Thorecta cacos, Lendenfeld. 

 Thorecta cacos, Lendenfeld, Mon. Horny Sponges, 1889, p. 349. 

 Two specimens are in the collection from Lake Illawarra. 

 Hitherto recorded from South Australia. 



Thorecta radiatus, Lendenfeld. 



(Plate xiii., tig. 26). 



Thorecta radiatus, Lendenfeld, Mon. Horny Sponges, 1889, p. 

 350. 



A single small specimen from Port Jackson is here doubtfully 

 referred to this species. The example is pedunculate and flabel- 

 late ; it is 130 mm. high, 95 mm. broad, and 25 mm. thick in the 

 centre ; the lamina is sublenticular, and rapidly decreases to the 

 margin. The apical border is convex, and bears six oscula ; the 

 central ones are rather prominent, and measure about 7 ram. in 

 their longer diameter. When viewed by transmitted light, the 

 main fibres are seen to be beautifully radiate and gracefully 

 curved outwards, and in the lower half downwards, so that 

 extremities of the fibres are lower than their origin at the centre 

 of the sponge. The secondary fibres are not very evident at the 

 surface ; the main fibres are very conspicuous, and are radiately 

 arranged. The texture is very similar to Thorecta exemplum, 

 var., marqinalis, but the surface lacks the reticulation which 

 forms such a marked feature of that species. 



The main fibres are soniewhat knotty, and cored with abundant 

 sand grains ; the secondaries are slender and generally at right 

 angles to the primaries in the denser parts, with oblong or square 

 mesh. Near the surface the mesh becomes more irregular, and 

 the sand-cored fibres are very abundant. 



Thorecta meandrina, Lendenfeld, 

 Thorecta meandrina, Lendenfeld, Mon. Horny Sponges, 1889, 

 p. 350, pi. xxiii., fig. 6. 



