SIPHONOCHALIITA. 95 



occurrence of irregular outgrowths. The surface is conulated. The conuli are 

 higher and much more abundant at the distal ends of the branches than near 

 the base. The upright branches attain a length of 300 millim, and a thick- 

 ness of 20-30 millim. The conuli are about 5 miUim. high. The vents are 

 situated terminally. 



The skeleton consists of a network of fibres 0*05 millim. thick, with meshes 

 0-5 millim. wide. The sjncules form an axial bundle in the fibres ; they 

 are oxea 0*1 millim. long and 0'0009 millim. thick. 



Geogeaphical Disteibutiojj'. — East coast of Australia : Port Jackson, 

 N. S. W. (Lendenfeld). 



Siphonochalina laxa, Lendenfeld. 



SiphonochaUna laxa, E. v. Lendenfeld, " Die Chalineen des australischen Ge- 

 bietes," Zoologische Jahrbiicher (Spengel), Band ii. Seite 803 (1887). 



The sponge consists of a reticulate mass of tortuous, irregular tubes, 

 10 millim. thick ; it attains a height of 200 millim. The surface is uneven, 

 the conuK are not so pronounced as in other species. The terminally situated 

 prseosculum measures 7 millim. in diameter. 



The skeleton consists of a network of fibres 0'067 millim. thick, with meshes 

 nearly 1 millim. wide. The spicules, oxea, are pretty abundant, 0*1 millim. 

 long and 0-002 miUim. thick. 



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

 N. S. W. (Lendenfeld). 



Siphonochalina extensa, Lendenfeld. 



Siphonochalina extensa, R. v. Lendenfeld, " Die Chalineen des australischen 

 Gebietes," Zoologische Jahrbiicher (Spengel), Band ii. Seite 806 (1887). 



The sponge consists of very wide, distally distended tubes, which are 120 

 millim. long, and at the end 135 millim. broad. The terminal vent measures 

 12 millim. in diameter. The surface is covered with abundant, sharp, and 

 pretty high conuli which point upward. 



The skeleton consists of a network of fibres 0-05 millim. thick, with meshes 

 0-4 millim. wide. The sjncules are very abundant, and form a dense bundle 

 in the axis of the fibres. They are oxea 0-067-0-074 millim. long and 

 0-0008-0-0016 millim. thick. 



Geographical Disteibution. — North coast of Australia; South coast of 

 New Guinea (ffaacke). 



