314 REVISION OF THE MONAXONID SPONGES,!., 



Figfi.S-4.—Ciiona (Papillis-sa) sp., allied to C/iona liixonii; portions of the 

 concave and convex surfaces respectively of a specimen having the 

 form of a thick, curved plate, showing the cliaracter and arrange- 

 ment of the surface-papillfe; ( x 5). 



Plate xvii. 



Figs. I, 2. — C/i07ia {Papillissa) lutea, from the types of Papillissa lutea 

 Lendenfeld; ( x ^). 



Fig. 3. — Spi7Xistrella(l) austra/is Lendenfeld; showing the skeleton (as pre- 

 pared by maceration by means of caustic potash) of the specimen 

 illustrated in PI. xv., fig.5; ( x h). 



Fig. 4. — Amorphmopsis megarrhaphea hendeuield; dermal skeleton; ( x 8). 



Fig.5. — Amorphinopsismeyarrhaphea Lendenfeld; pattern of the skeleton as 

 shown in portion of a moderately thin section ( x 10 approximately). 



Fig. 6. — Tcdania digitata var. rubicunda, from the type of T. rubicunda 

 Lendenfeld; ( x ^). 



Plate xviii, 



YigA. — Cmdospongia, elegans, from the type of Plectodendron elegans Len- 

 denfeld; ( x 5). 



Fig.2. — A xiamon folium, sp.nov. ; ( x^). 



Fig.3. — A xiamon folium (var.?); ( x ^). 



Fig. 4. — Hemitedania anovi/7na Carter ; from a specimen of somewhat carti- 

 laginous consistency, and with coarse-fibred skeleton; ( x ^). 



Plate xix. 

 Fig. 1. — Hemitedania anonyma Carter, from a specimen labelled as the 



type of Halichondria rubra Lendenfeld; ( x f ). 

 Fig.2. — Hemitedania anonyma', from a macerated, coarse-fibred specimen; 



(xi). 

 rigs.3, 4, 5. — Hemitedania anonyma; illustrating various forms assumed 



by examples of this species; ( x h approximately). 



Plate XX. 



Fig.L — Clialina fnitiina WWiiaXegge [won Schmidt); an incomplete speci- 

 men. 



Y'lg.l.— Phlnodidyon ramsayi, from one of the co-tj'pes of Rhizochalina 

 ramsayi Lendenfeld; illustrating a specimen of irregular shape pro- 

 vided with many root-like processes. 



Fig.3. — Phkeodictyon ramsayi var. pyriformis{yA,T.uov.) ; portion of the 

 upper surface showing the sieve-like area formed by the closely 

 apposed oscula; ( x 5) 



FigsA-5. — Phl(Todictyon ramsayi; tangential sections close beneath the 

 surface, showing the pattern of the reticulation formed by fibres of 

 the ])ast-la3'er in the wall of the fistula and in between the fistulas 

 respectively; ( x 10). 



