PIITLOSIPIIONIA. 93 



processes are 200 millLm. long, 20 millim. thick, and irregularly cylindrical. 

 The praeoscula measure 20 millim. in diameter. 



The skeleton consists of a network with meshes 0-26 millim. wide and fibres 

 0-067 millim. thick. Spicules: oxystrongyla 0-09 millim. long and 0*004 

 millim. thick are observed in the main fibres, but absent in the connecting- 

 fibres. Oxystrongyla similar to those in the main fibres are also found scat- 

 tered throughout the ground-substance. 



Geogbaphical Distribution. — East coast of Australia : Port Jackson, 

 N. S. W. {LendenfeU). 



Phylosiphonia intermedia, Ridley and Dendy. 



Phylosijphonia intermedia, E.. v. Lendeufeld, " Die Chalineen des australischen 

 Grebietes," Zoologische Jahrbiicher (Spengel), Band ii. Seite 800 (1887). 



Siplionoclialina intermedia., S. 0. Ridley and A. Dendy, " Preliminary Report on 

 the Monaxonida collected by H.M.S. ' Challenger,' "' Annals and Magazine 

 of K^atural History, ser. 5, vol. xviii. p. 331 (1887). 



Si/plwnochalina intermedia, S. 0. Ridley and A. Dendy, "Report on the Mon- 

 axonida," The Zoology of the Voyage of H.M.S. ' Challenger,' part 59, 

 p. 30 (1887). 



The sponge consists of erect, cylindrical, tubular branches, 200 millim. long, 

 which are distally widened, and at the base 20 millim. thick ; further up they 

 attain a diameter of 35 millim. The terminal pra^osculum, which is sur- 

 rounded by a kind of collar, is 15 millim. wide. The surface is smooth 

 or uneven. The tube is here and there extended by irregular annular 

 thickenings. 



The skeleton is composed of a network of fibres 0-04 millim. thick, with 

 meshes 0*3 millim. wide. Li the axis of the main fibres a continuous bundle of 

 spicules is observed. The spicules are much less numerous in the connecting- 

 fibres; they are oxystrongyla, measuring 0-1 millim. in length and 0-006 

 millim. in thickness. Similar spicules are also observed scattered in the ground- 

 substance. 



Geogeaphical Disteibtttion. — East coast of Australia : Port Jackson, 

 N. S. W. {Lendenfeld). 



Phylosiphonia annulata, Ridley and Dendy. 



Phylosijphonia annulata, R. v. Lendenfeld, " Die Chalineen des australischen 

 Grebietes," Zoologische Jahrbiicher (Spengel), Band ii. Seite 798 (1887). 



Siphonochalina annulata, S. O. Ridley and A. Dendy, " Preliminary Report on 

 the Monaxonida collected by H.M.S. ' Challenger,' " Annals and Magazine 

 of Natural History, ser. 5, vol. xviii. p. 331 (1887). 



