1134 A MONOGRAPH OF THE AUSTRALIAN SPONGES, 



Gastric Quaclr (radiates, Ceatripetal, protruding ray O'l x 0*008 

 conic, pointed, mostly straight, sometimes slightly curved near 

 the end. Tangental ray sagittally developed. One ray situated 

 longitudinally and pointing towards the aboral pole shorter than 

 the other two. Angles on the side of it equal, about 100*^ This 

 ray measures 0*08 x 0-006. The other two equal rays 0-12 x 

 0-008 mm. 



Triradiate and Quadriradiate spicules of the Parenchyma. The 

 Triradiates are equiangular with straight, conic, terminally 

 rounded rays. The rays mostly sagittally developed. The 

 unpaired ray longer than the other two pointing outwards 

 and measuring 0-28 x 0-014 mm. The others 0-22 x 0-014 mm. 

 Some regular Triradiates are also met with. Their rays have 

 varying intermediate dimensions between the longer and shorter 

 ones of the sagittal Triradiates. Some of the latter show an 

 incipient fourth ray. Decidedly Quadriradiate spicules are rare. 

 Their rays have the same dimensions as those of the Triradiates, 

 but are generally curved. 



Acerate spicules. These measure 1-7x0 035, are spindle-shaped 

 and slightly curved. The concave side towards the Osculum. 

 They are immersed in the body of the Sponge about half their 

 length and stand nearly vertical on its surface. Both ends are 

 sharply pointed. These spicules are not very numerous. The 

 sheath, which covers the spicules of calareous Sponges generally, 

 is very highly developed on the protruding part of these spicules, 

 much more so than in any other calcareous Sponge known to me 

 and I have derived the specific name from this characteristsc 

 peculiarity. 



Locality : East Coast of Australia, Port Jackson, V. Lendenfeld. 



47. SPECIES. LEUCANDRA CUCUMIS. E. Haeckel (1). 



This sponge is solitary and forms a cylindrical or spindle-shaped 



person of 15 to 20 x 7 to 10. The longitudinal axis is mostly 



more or less arched. Opposite the narrow peduncle there is the 



round Osculum of 1 -5 to 2 mm., in diameter. The dermal surface 



(1.) E, Haeckel. Die Kalkschwamme. Erne Monographic. Baud II, , Seite 

 205 ; Band III., Tafel 33, figs. la-Ik., Ttxfel 36, figs 1-3. 



