444 REVISION OP THE MONAXONID SPONGES, ill., 



EXPLANATION OF PLATES XV.-XXIV. 



Plate XV. 



Fig. L — Solla>if-JI,<i diijitata Lendenfeld; ( x §). 



Fig. 2. — SoUasdia dujitatd Lendenfeld, from the t3'pe; ( x g). 



Fig.3. — Donatid Jissnrata Lendenfeld; (slightly reduced). 



Fig. 4. — Donatia philliptiisis Lendenfeld; surface-section showing the 



dermal reticulation, the primary meshes of which are subdivided 



(by lines of tylasters) into smaller meshes, each enclosing a pore; 



( X 18). 

 Fig.5. — SpirastreUaC!) anstralis Lendenfeld; a flabellate example; ( x ^). 

 Fig. 6. — Polymastia zitteli, from the type of Siderodermazittelii Lendenfeld; 



(nearly nat. size). 'J'he specimen is in a fragmentary condition. 



Plate xvi. 



Fig. L — Cliona [Pajnllissa) hixoni, from the type of Baphyrwi hixonii Len- 

 denfeld ; portion of the exterior, showing the character of the 

 surface-areolation; ( x f ). 



Fig. 2. — Cliona {Papillissa) hixoni; showing the skeleton' (after maceration 

 by means of caustic potash) of a thick slice of a small specimen; 

 'nat. size). 



Figs.3-4. — Cliona. (Papillissa) sp., allied to Cliona hixonii; portions of the 

 concave and convex surfaces respectively of a specimen having the 

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

 ment of the surface-papillae; ( x f ). 



Plate xvii. 



Figs. 1,2. — Cliona [Papillissa) lutea, from the t3'pes of Papillissa Intea 

 Lendenfeld; ( x ^). 



Fig. 3 — Spirastrella{t) anstralis Lendenfeld; showing the skeleton (as pre- 

 pared by maceration b}^ means of caustic potash) of the specimen 

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



VyifA.—Amofjj/iinopsis meyarrhaphfa Lendenfeld; dermal skeleton; ( x 8). 



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

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



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

 Lendenfeld; ( x i). 



Plate xviii. 



Y\gA.-- Ca^dospongia elf^gans, from the type of Plectodendron elegans Len- 

 denfeld; ( x f). 



Fig. 2. — Axiamonfoliuvi, sp.nov. ; ( x ^), 



Fig.3. — Axiamonfoliuvi (var.?); ( x ^). 



Fig. 4. — Htmitfdania ano7i7/ma Carter ; from a specimen of somewhat carti- 

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



