DACTTLUCHALINA. — EUCHALINA. 101 



A mass of anastomosing repent digitate branches, which form an irregular 

 network. The whole sponge attains a length of 500 millim. ; the cylindrical 

 digitate parts are 10 millim. thick. 



The sl-eleton consists of a network with meshes 0-4 millim. wide and fibres 

 0-03 millim. thick. Spicules very abundant oxea, 0-067 long and 0-003 

 millim. thick. 



Geogkaphical Distkibution. — East coast of Australia : Port Jackson, 

 N. S. W. {Lendenfeld). 



Dactylochalina cyUndrica, Lendenfeld. 



JJacttflochaUna cyUndrica, E. v. Lendenfeld, " Studies on Sponges. — IV. On 

 two cases of Mimicry in Sponges," Proceedings of the Liunean Society 

 of New South Wales, vol. x. p. 570 (1886). 



Dactylochalina cyUndrica, E. v. Lendenfeld, •' Die Chalineen des australischen 

 Gebietes," Zoologische Jahrbucher (Spengel), Baud ii. Seite 812 (1887). 



Large, digitate, reticulate sponges, which attain a length of 500 millim. 

 The digitate branches, which frequently anastomose, are 8 millim. thick. The 

 oscula are not numerous, scattered, and very prominent; they measure 3 

 millim. in width. 



The sleletou consists of a network with meshes 0-3 millim. wdde and fibres 

 0-04 millim. thick. The spicules are scarce in the connecting-fibres and 

 fairly abundant in the main fibres ; they are straight, sharp-pointed oxea, 0-09 

 millim. long and 0-002 millim. thick. 



Geographical Distiiibution. — East coast of Australia : Port Jackson, 

 N. S.W. (Lendenfeld). 



Genus EUCHALINA. 



Dactyloclialininse with slender digitate processes. Skeleton-net 

 with very fine meshes. Fibres thin ; spictiles abundant ; oscula 

 small. 



Euchalina exigua, Lendenfeld. 



Euchalina exiyua, 11. v. Lendenfeld, " Die Chalineen des australischen Ge- 

 bietes," Zoologische Jahrbiicher (Spengel), Band ii. Seite 818 (1887). 



Very thin, slender, ramified or simple, digitate, cylindrical branches grow 

 out from a common basal plate ; they are 300 millim. long and 4 millim. thick. 

 The surface is quite smooth and slightly uneven. The oscula, 0-6 millim 

 \\ ide, are abundant and scattered o\vr the \\h(^le of the surface 



