1910. | Pharetromd Sponge from Christmas Island. bag 
EXPLANATION OF PLATES. 
Puate 10. 
1, 2.—Murrayona phanolepis, gen. et sp. nov. Specimens B,C. Nat. size. 
3.—Specimen A, showing oscule. Nat. size. 
34.—The same, showing pore-area, inside view. Nat. size. 
3B.—The same, showing pore-area and scales. x95. 
4.—Surface of portion of firm skeletal framework. x 20. 
5.—Fragment broken off from pore-area, showing surface-pores, a sub-dermal space, 
and a surface-cluster of flagellated chambers, with prosopyles and-—on deeper 
plane—apopyles. 
6.—Under surface of a dermal scale, showing tuning-forks loosely adherent. x 125. 
7.—Broken fragment of same. a, canal. x 20. 
8.— Portion of pore-area, showing 3 pores. x 125. 
9.—Ground-down section of skeletal network. «a, oscular region. X12. 
Puate 11. 
Fig. 10.—Dermal scales. x12. 
11.—Dermal scale. x 125. 
12.—Flagellated chambers, showing apopyles. 125. 
13.—Sectich of canals and flagellated chambers. x 125. 
14.—Section of a strand of the firm framework, showing fibrille. x 1150. 
15.—Surface of a strand of same, showing ends of fibrille. x 1150. 
16.—Portion of skeletal framework, showing the flake-like structure and fibrille. 
17, 18, 19, 23, 24.—Triradiate spicules. x 425. 
20, 21, 22, 25, 26.—Tuning-fork spicules x 426. 
