28 DENDRILLA. 



The skeleton consists of dendritically ramifying fibres, which anastomose 

 here and there. The stems are 0-3 millim. thick. The pith-cylinders have a 

 diameter equal to four fifths of the diameter of the whole fibre in the 

 branches, but equal to only half of the thickness of the fibre in the stems. 



Geogbaphical Pistbibution. — East coast of Australia : Port Jackson 

 (Lendenfeld). 



Dendrilla caespitosa, Carter. 



Aplifsina coespitosa, H. J. Carter, " Suppleuient to the Descriptions of Mr. 

 Bracebridge Wilson's Australian Sponges," Annals and Magazine of Natural 

 History, ser. 5, vol. xviii. p. 282 (1886). 



The sponge consists of a 240 millim. high and 180 millim, broad mass of 

 folded ]-3 millim. thick fronds. The whole structure is very light and loose. 

 The living sponge is light yellow, the skeleton is black. The surface is covered 

 with slender conuli, 2 millim. high and 2 millim. apart. 



The final ramifications of the fibres of the sl-eleton arc i-emarkably smooth, 

 0-16 millim. thick. The thickness of the pith-cylinder is equal to about two 

 thirds of the fibres, 



GEOGRAPniCAL DISTRIBUTION. — South coast of Australia : Port Phillip 

 Heads ( Wilson). East coast of Australia : Port Jackson (LendenfM). 



Dendrilla rosea, var. typica (Selenka), n. var. 



Aphjsilla cactus, F. E. Schulze, " Untersuchungen liber den Ban und die Ent- 

 wicklung der Spongien. — IV. Mittheilnng. Die Eamilie der Aplysinidai," 

 Zeitschrift fiir wissenscaftliche Zoologie, Band xxxv. Seite 417 (1878). 



Dendrilla rosea, U. von Lendenfeld, " Ueber Coeleuteraten der Siidsee.— -IT. Mit- 

 theikmg. Neue Aplysinidae," Zeitschrift fiir wissenschaftliche Zoologie, 

 Bandxxxviii. Seite 271 (1883). 



Sj)Ongelia cactus, E. Selenka, "Ueber eiuige Schwamme aus der Siidsee," 

 Zeitschrift fiir wissenschaftliche Zoologie, Band xvii. Seite 565 (1867). 



Irregularly massive, pedunculate sponges, which attain a height of 150 

 millim. The peduncle of large specimens is 15 millim. thick. The surface is 

 covered with very large conidi, which are on an average 5 millim. high and 10 

 millim. apart. The oscula are few in number and situated on the upper surface ; 

 they are smaller and more numerous in small specimens than in large ones. 

 In very large specimens a single osculum is observed on the summit of the 

 sponge ; this has a diameter of 10 millim. The living sponge is flesh- 

 coloured. 



