
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
PORIFERA OF THE L.M.B.C. DISTRICT. is 
EXPLANATION OF THE PLATES. 
Bladder cells. o. Ova. 
Choanosome. os. Osculum. 
. Ciliated chambers. p. Pores. 
Ectosome. p.m. Pore membrane. 
bo 
. Longitudinal bundles of spicules in transv. section. 
PLATE V. 
. Raspailia stelligera, S., nat. size. 
. Raspailia viminalis, §., nat. size. 
. a.,b.and c. Stylote spicules of Raspailia viminalis, 
S. (x 55). d. Spined spicule of the same (xX 235). 
. Portion of a transverse section through the middle - 
of the stem of Raspailia viminalis (x 40). 
PLATE VI. 
. Tylostylote spicules of Polymastia mammillaris. 
G(X 100) One 235)r 
. Transverse section through one of the papille of 
Polymastia mammillaris (x 100). 
. Longitudinal section through one of the papille of 
Polymastia mammillaris (X 60). 
PEATE VIL. 
. Vertical section through Seirtola compacta, n. sp. 
(x 100). [N.B. The third cladus of every triena 
has been left out as standing nearly at right angles 
to the plane of the section. ] 
. Microscleres of Seirtola compacta, n.sp. a. (X 1000); 
b. (x 1000); ¢. (500). 
. The cladome of a dichotriena of Sezriola compacta, 
n. sp. (X 200). {[N.B. The rhabdome must be 
imagined as standing vertically upon the centre of 
the cladome. } 
