I—4 
5—8 
9; LO} LOG, TI 
| t2—70 
47 
ic, 18 
19 
ig. 20 
PLATE Ww, 
Ragadinia annulata n. sp. Different forms of single 
and combined skeleton spicules. Fig. 3. shows two 
of the spicules attached together 49 utd Unt 
Racodiscula and allied genera. Detached and com- 
bined skeleton spicules. Fig. 7 shows a portion of 
the skeleton with the spicules naturally attached 
together +° rs Misa 18 oc ae Ses a eS Um 
Stauractinella cretacea n. sp. Free skeletal spicules 
Hyalostelia fusiformis. Free skeletal spicules 
Leptophragma, sp. Fragment of the skeletal mesh 
Leptophragma, sp. Skeletal mesh with solid nodes 
Craticularia sp. Skeletal mesh with solid nodes 
Cystispongia sp. Skeletal mesh with solid spherical nodes 
The same. Surface layer of the skeletal mesh 
Coscinopora, sp. Fragment of the skeletal mesh with 
lantern nodes Leaked os 
The same. Portion of the outer membrane 
The same. Fragment of the root-fibres 
Ventriculites? sp. Portion of the surface membrane. 
The same. Fragment of skeletal mesh with lantern 
nodes i Meee Segui hrs: Me Ro a ana nee ae 
Spined shaft of anchoring spicule of Hexactinellid 
sponge SER Sa atk oe Caer 
Spicules showing irregular tubes or borings in their 
interior +° She. eee ee ee AS 
Trifid spicule, showing infiltration of the inner por- 
tion of the spicule, as well as of the canal. 
are drawn to the scale of 40 diameters the rest 
of the figures are on the same scale of 20 dia- 
meters, All are drawn by means of the Camera lucipa. 
pag. 
58 
60 
70 
71 
65 
66 
66 
67 
67 
68 
68 
68 
69 
69 
72 
73 
14 
