PLATE II. 



Fig. i (1033). Placospongia melobesioides . Cortical tissue of groove, transverse section; a con- 



centrical fibres, b groups of longitudinal fibres; X 96. 

 Fig. 2 (1033). Placospongia melobesioides. Transverse section through a branch; i.c. incurrent 



canal; 14. 

 Fig. 3 (1033). Placospongia melobesioides. Cortical tissue of groove, longitudinal section ; a con- 



centrical fibres, b non-concentrical fibres; X 96. 

 Fig. 4 (1033). Placospongia melobesioides. Tangential section through cortex; a layer of sterro- 



spirae; b radial bundies of tylostyles; c fibrous tissue of groove; • 14. 

 Fig. 5 (1458). Placospongia carinata. Transverse section through a portion of a branch; a supposed 



main excurrent canal with proct in longitudinal section; b axis; ■ 24. 

 Fig. 6 (1033). Placospongia melobesioides. Longitudinal (radial) section through a groove, showing 



the system of incurrent canals (i.c.)\ a cortex; b parenchyma ; X 48. 



