BY R. VON LENDENFELD, PH.D. 21 



conical inhalant canals (I) into the ciliated chambers (f), which 

 possess apparently from 3 —5 inhalent pores at their distal rounded 

 ends, exclusively (h.) Amoeboid wondering cells (d) are also 

 found in the Mesoderm between the ciliated chambers. 



Fig. 5. — Bajalus laxus. R. v. L. A portion of the thread network in the 

 central Gastral cavity of the Sponge. The thread is filled with 

 Spermospores containing numerous Spermatozoans each, 1,000:1. 



Fig. 6. — Chondrosia Ramsayi. R. v. L. Half a middle sized, flat specimen, 

 in natural size drawn from a spirit specimen from the Australian 

 Museum. The Oscula are slightly raised above the rest of the 

 surface, but not surrounded by an incurved fringe as in Osculina. 



Fig. 7. — Chondrosia Ramsayi. R. v. L. Transverse section, vertical to 

 the upper surface 1:20. A coi'tex is well defined, (c) outwards it is 

 dark colored (h), and full of pigment granules, below it is light and 

 transparent. The Pulpa (p) is colored much darker and very 

 intransparent. Below the surface there is a layer of small anas- 

 tomising irregular tangental canals, which form a kind of subdermal 

 cavity (i). They unite to form large likewise tangental inhalent 

 canals (t). From these small inhalent canals of a more or less radial 

 direction originate the ramifications of these bear the ciliated 

 chambers. The inhalent canals (e) unite to form large lacunose 

 canals leading into the Oscular tubes. 



Fig. 8.— Chondrosia Ramsayi. R. v. L. Transverse section through the 

 Cortex showing the structure of the subdermal cavities and the 

 distribution of pigment 1:200. 



Fig. 9.— Chondrosia Ramsayi. R. v. L. Section through part of the Pulpa 

 1:80. Inhalent branch canals (j). Ciliated spherical chambers (c). 

 Exhalent canals (e). 



Fig. 10. — Chondrilla secunda. R. v. L. Drawn from life in natural size. 

 Fig. 11.— Chondrilla secunda. R. v. L. A large spherical spicule 300:1. 

 Fig. 12.— Chondrilla secunda. R. v. L. A small spherical spicule 300:1. 



