1902.] SPOXGES OF THE '' SKEAT EXPEDITION." 211 



numerous, with raised margins, almost regularly an-anged at dis- 

 tances of 5 mm. from one anothei-. Pores large, conspicuous. 



Skeleton composed of multispicular main fibres connected by 

 a unispicular network. The main fibres run vertically, and their 

 projecting distal ends I'aise the dermal membrane into small 

 prominences. 



Spicules, oxeas with gradually tapering ends or with rounded 

 end frora which a short point projects, 0*12-0'13 x 0"007- 

 0-008 mm. 



Great Redang. 



3. Reniera sp. 



A pink sponge forming irregular encrusting lobes. Oscula 

 about 1*5-2 mm. in diameter. 



Skeletal network with one or two spicules to the mesh. Dermal 

 membrane smooth, pores fairly conspicuous. 



Oxeas O-10-O-ll X 0-0056 mm. 



Embiyos are present in the basal parts of the sponge, having a 

 skeleton of scattered fine oxeate spicules. 



Pulau Bidang. 



4. Reniera sp. 



Sponge ear-shaped, encrusting, thickest in the neighbourhood 

 of the single large osculum, which is marginal. Compact, brittle. 

 Colour, when fresh, grey. 



Dermal membrane smooth. Pores visible, largely in rows. 

 Main fibres multispiculate ; spongin fairly plentiful. 



Oxeas 0-098 x 0-002 mm. to 0-13 x 0-007 mm. 



Pulau Bidang. 



5. Reniera sp. (Plate XY. fig. 3.) 



Two small fragments of a sponge of gelatinous consistency. 

 Coloiu- pinkish grey. Oscula from, 1-3 mm. in diameter. Surface 

 vSmooth, pores not obvioiLS. 



Spongin abundant, forming considerable swellings at the nodes 

 of the unispicular mesh and occasionally completely enveloping 

 the spicules along their whole length. 



" Reniera filaments" and " chaplets " are present. 



Spicules slender oxeas with somewhat blunt points, 0-08-0-09 x 

 0-003 mm. 



Gi-eat Redang. 



6. Reniera sp. 



Sponge consisting of creeping branches attached at intervals, 

 sometimes 5 mm. thick, sometimes forming quite a thin crust. 

 Texture compact and resistant. Oscula 2 mm. in diameter with 

 slightly raised thin margins. 



Mesh unispicular, with some stout multispicular strands, having 

 as many as 8-10 spicules on a cross section. Dermal membrane 

 smooth, rather easily detached. 



Oxeas bent, stout, 0-87-0-94x0-005 mm. 



Pulau Bidang. 



14* 



