672 REVISION OP THfe AXINELLID^, ill., 



Fig.3. — Higyivsia coralloideH var. scahra Whitelegge ; extremity of a 

 frond-like lobe of the sponge, desarcodised, showing the discon- 

 tinuous surface -ridges and the deep intervening grooves, the latter 

 almost obliterated (in the lower portion of the figure) by synapticula- 

 like connections between the former; (nat. size). 



Fig. 4. — Rhaphoxyai't) jjaU ida Dendy; skeleton remaining after desarcodi- 

 satioii of a (3 mm. thick) vertical slice of an entire specimen by 

 means of caustic potash; (nat. size). 



Fig.o. — Rhaphoxya fypica, sp.nov. ; the skeleton remaining after desarco- 

 disation of a (3 mm. thick) vertical slice of an entire specimen; (nat. 

 size). 



Plate xl. 



Hi(j<jitma coral/oides var. massalis Carter. 



Fig.l. — .Showing pattern of the skeleton as seen in a thin section in the 



mid-plane of one of the component lamelliv near its upper margin; 



( X 15). 

 Fig.2.- — Showing pattern of the skeleton as seen in a thin section parallel 



to, but at some distance from, the mid-plane of a component lamella 



near its upper margin; ( x 1.5). (This figure and the preceding one 



are from sections of two different specimens). 

 Figs. 3-4. — iSurface-sections, showing the arrangement of the dermal pores; 



(x40). 



Plate xli. 



Hi[i{ii)iiiia coraHoides var. scaln-a Whitelegge. 

 Fig.l. — Sectitjn of the skeleton (at the extremity of a frond-like lobe), cut 



in a direction perpendicular to the planes of the component lamellse; 



( X 3|). 

 Fig.'2. — Portion of tlie preceding figure enlarged; ( x 12). 

 Fig.3. — Portion of a single lamellar component of the skeleton; ( x 4). 



Plate xlii. 



Rhaphoxya typica, sp.nov. 



Fig.l. — Longitudinal section of the skeleton in proximity to the surface; 



( X 12). 

 Fig.2. — Longitudinal section of the skeleton remote from the surface of 

 the sponge; ( x 12). 



Plate xliii. 



Rhaphoxyai't) paf/ida Dendy. 



Fig.l.- — Longitudinal section of the skeleton in proximity to the surface; 



( X 12). 

 Fig.2 — Longitudinal section of the skeleton remote from the surface of 

 the sponge; ( x 12). 



