220 ox THE SroXGES OF THE " SKEAX EXrEDITIOX." [Jvme 17, 



a few cells, foi- the most part about 9 cells may be seen on a cross 

 section. 



Oxeas 1-4 X 0-016 to 3-2 x 0-048 mm. 



Protrisenes 2-3 mm. long; cladus 0-03-0-18 mm. 



Anatrifenes 2-2 nnn. long ; cladus 0-04-0-08 mm. 



Sigmata 0-008-0-009 mm. 



Pulau Bidane- off the coast of Kedah. 



Keratosa. 



27. EUSPOXGIA OFFICINALIS ? vai". KOTUNDA. 



It is fairly evident that a small piece of sponge separately 

 preserved has been cut off from one of two large specimens, 

 though there is no note to that effect. In this more cai-efully 

 treated piece the ectosome is preserved, while in the whole sponges 

 very little of it remains and the sui'face consequently has a honey- 

 combed appearance. 



Sponge about .50 mm. high, forming a massive circular wall 

 round a small central hoUow. 



Oscula numerous, 2-6 mm. in diameter. 



Conuli 0-88-1*5 mm. apart and about 0-5 mm. high. 



Main fibres 0-04-0-08 mm. thick and on an average -8 mm. 

 ajoart. 



Secondary fibres 0-01-0-03 mm. thick, the most common thick- 

 ness being 0-02 mm. 



Ciliated chambers 0-02-0-03 mm. in diameter. 



Aphodal canals 0-015 mm. broad and 0-02-0-03 mm. long. 



Colour, in spirit, dai-k grey externally and pinkish buff within. 



Great Redang. 



28. Stelospoxgia sp. 



A small sponge growing on a piece of dead coral. 



Surface vei-y smooth, with spai'se low conuli. 



The skeleton is irregiilai-, conspicuously closei--meshed in parts, 

 but it is somewhat difficult to speak of definite fascicles. These 

 smaller meshes measure from 0*3-0-5 mm., while the large ones 

 are about 1*0 mm. 



The main fibres measure 0-08-0-12 mm. and have as a rule a 

 dense coi'e of foreign spicules. Occasionally thei-e are large sand- 

 grains at the nodes of the skeleton. 



The secondary fibres have a slender axial thiead or line of 

 foi-eign spicules, or sometimes are quite free of spicules. 



Great Redang. 



29. Spongelia digitata, sp. n. (Plate XIY. fig. 4 and 

 Plate X.Y. fig. 2.) 



Sponge attached by a thin encrusting base to a rod-shaped 

 piece of dead coral. From this it rises as a long i-idge (50 mm. 

 long) which breaks up distally into flattened, bluntly ending 

 processes, measuring 25 x 3-10 mm. 



