PLATE II. 



Stannophyllum . 



Figs. 1-4. Stannophyllum zonarium, n. sp. (p. 62). 



Diam. 

 Fig. 1. A small portion of the dermal surface, with a single pore (p), . x 70 



f 



Fig. 2. Another small portion of the dermal surface, more highly magnified, 

 with three pores (p). m, maltha (ground-mass of the mesoderm) ; 

 f, spongin-fibrillaa ; r, Radiolarian shells, . . . . x 200 



Fig. 3. Section through a large subdermal cavity. Characters as in fig. 2. 



h, symbiotic hydrorhiza, . . . . . x 70 



Fig. 4. View of the distal margin of the flabelliform sponge, with the irregular 



lacunar cavities of the canal system, . . . x 30 



Figs. 5, 6. Stylactella spongicola, n. sp. (Tubularian Hydroid, p. 80). 



Fig. 5. Network of the symbiotic hydrorhiza, creeping below the dermal 

 membrane of Stannophyllum globigerinum, with numerous well 

 preserved hydranths, . , . . . x 30 



Fig. 6. Tubularian polyp-stock symbiotic with Stannophyllum globigerinum. 

 h, hydrorhiza ; g, gonophores ; e, eggs ; v, germinal vesicles ; 

 y, hydranths, . . . . . . x 70 



Fig. 7. Stylactella abyssicola, n. sp. (p. 81). 



Fig. 7. Tubularian polyp-stock symbiotic with Psammophyllum annectens 



(see p. 53). Characters as in fig. 6 ; s, spermarium, . x 70 



