PLATE I. 



Fig. i — 4. Placospongia cariuata. 



Fig. 1 (311b). Entire specimen, branched; about 1 / 2 size. 



Fig. 2 (1458). Entire specimen, covered here and there by corals and calcareous algae ; nat. size. 



Fig. 3 (1848). Entire specimen, incrusting in a, with lateral branches; nat. size. 



Fig. 4 (577). Incrusting specimen; nat. size. 



Fig. 5 — 9. Placospongia mclobesioides. 



Fig. 5 (1033). Portion of a branched specimen, with wide grooves; a holes, occupied by 



Balani : x 3 1 /.. 

 Fig. 6 (660 c). Fragment of specimen with very indistinct grooves and carinae ; nat. size. 

 Fig. 7 (660a). Idem; a axis. 



Fig. 8 (1847). Entire specimen, attached in the centrum, with two lateral branches ; nat. size. 

 Fig. 9 (660 b). Incrusting specimen ; nat. size. 



