682 EXPLANATION OF THE PLATES. 



Fig. G. Reniera cribriformis. The most complete of the fragments, 

 representing the type specimen, from the exterior. In 

 spirit. From Seychelle Islands, 12 fms. x |. 



H & H'. R. camerata. Two fragments, probably belonging 

 to ono (the typical) specimen. H shows the compact, 

 even character which distinguishes the outer surface; 

 H' the chambered or plicate condition of the interior. 

 In spirit. From Marie Louise Island, 16-17 fms. Nat. 

 size. 



I. Clathria mceandrina. Part of the type specimen, incrusting 

 a stem. In spirit. From Marie Louise Island, Amirantes, 

 17 fms. Nat. size. 



J. C. frondifera. The largest specimen obtained ; attached to 

 rock. It shows a transition from a flattened expanded 

 (j) to a rounded trabecular (/) form of the constituent 

 lobes of sponge-substance, and exhibits more definiteness 

 of form as a whole than is usual in the species. Dry. 

 From Providence Reef, 24 fms. Nat. size. 



K. G. decuynbens. The type specimen, showing considerable 

 variation in the proportionate amount of fenestration to 

 the surface (e. g. at Jc the surface is entire, at Jc' it is regu- 

 larly fenestrate) ; at Jc" the surface is abraded. In spirit. 

 From Etoile Island, 13 fms. Nat. size. 



L. Leucortis anguinea. The type specimen, in spirit. From 

 Providence Reef, 24 fms. x 2. Z, stem. 



M. Erylus ajlindrigerus. The type specimen, in spirit. From 

 Providence Reef. Nat. size. 



N*. Phyllospongia madagascarensis, var. supraoculatu . From 

 African Island. Dry. N'. The same, upper margin of 

 median lobe, from above, to show thickness of frond and 

 characters of vents. Nat. size. 



* T5y an inadvertence these figures have been referred to in the text (p. 594) 



as M and M' 



