322 A MONOGRAPH OF THE AUSTRALIAN SPONGES, 



EXPLANATION OF PLATES, 



Plate XXVI. 



Fig. 1. — Halme Nidus Vesparum. R. v. L. Bulbous Form with small 

 pores from Port Jackson. Drawn from life. Natural size. 



Fig. 2. — Halme Nidus Vesparum. R. v. L. Form with finger-shaped 

 processes, with larger polygonal pores from Port Stephens. Drawn 

 from a spirit specimen. Natural size. 



Fig. 3. — Halme simplex. R. v. L. Brown specimen with wide lacunje 

 from Torres Straits. Drawn from a spirit specimen. Natural size. 



Plate XXVII. 



Fig. 4. — Halme Nidus Vesparum. R. v. L. Transverse section through 

 the specimen represented in fig. 1, the bulbous variety. Drawn 

 from a thick section. Natural size. 



Fig. 5. — Halme Nidus Vesparum. R. v. L. Transverse section through a 

 specimen of the finger shaped variety, represented in fig. 2. Drawn 

 from a thick section. Natural size. 



Fig. 6. — Halme simplex. R. v. L. Transverse section through the specimen 

 represented in fig. 3. Drawn from a thick section. Natural size. 



Fig. 7. — Halme Nidus Vesparum. R. v. L. Transverse section through 

 one of the finger shaped processes of the specimen represented in 

 fig. 2. Alcohol alum-carmine specimen. Taken from one of a 

 series of sections. Magnified 50:1. (0). Portion of the outer 

 surface of the sponge. (/). Portion of an internal lamella. (P). 

 Pores of the inhalent canal system. (T). Large foreign bodies, 

 sand granules, forming a dermal armor on the exposed outer 

 surface. (/). Small foreign bodies, mostly sand granules forming 

 a dermal layer on the surface of the internal lamellas. (s). Sub- 

 dermal cavities of the inhalent canal system, {e). Inhalent canals, 

 (a). Exhalent canals. (/7). Radial, knobby main fibres, which are 

 filled with large sand granules similar to those in the external 

 cortex. {V). Tangental, solid and slender connecting fibres which 

 are free from foreign bodies. {O). Ciliated Chambers. 



Plate XXVIII. 



Fig. 8. — Halme Nidus Vesparum. R. v. L. Portion of the skeleton in the 

 interior of the sponge (the skeletons of the ditferently shaped 



