Catalogue of Non-Calcaveoiis Sponges. 253 



Megasckres, almost straight, very slender strongyla or tylota 

 with irregular heads, measuring about 0-18 by 0-0025 mm. 



Microsderes, slender C-shaped sigmata of very regular form 

 and bluntly pointed or even slightly swollen at the extremities, 

 measuring about 0-016 ]nm. from bend to bend. The surface of 

 the spicule may be very finely roughened. 



R.N. 540 (x, 19 f ; "buff"); 613 (s. 5, 7 f ; "ochre-yellow"); 

 658; 735 (x B; "yellowish buff with reddish tips "); 817; 1054 

 (x A); (? R.N. 663; 711). 



Chojidmpsis lamella.^ Lendenfeld, sp. 



Fhoriospongia /aineila, Lendenfeld, Monograph of Horny 

 Sponges, p. 602. Plate 37 ; figs. 2, 5, 6, 9, 11. 



These are compressed, flabellate sponges, with sub-glabrous, 

 sometimes slightly conulose surface, and small, scattered or mar- 

 ginal vents. They are intensely sandy throughout, incompressible 

 and friable. The megascleres are very few slender strongyla ; 

 the microscleres are sigmata, characteristically long, slender and 

 much contorted. 



R.N 520 (x, 20 f ; "ferruginous") ; 1019 (x B). 



CJiondropsis chaliniforiuis, Lendenfeld, sp. 



Phoriospongia chaliniforuiis., Lendenfeld, Monograph of Horny 

 fSponges, p. 600. 



The specimens ai-e compressed, flabellate or palmo-digitate, 

 with vents scattered on one side or marginal. The surface is 

 subglabrous with sandy reticulation showing through the thin 

 dermal membrane. Texture slightly compressible, very sandy, 

 friable. Colour in spirit very characteristic, chocolate-brown 

 throughout, the colouring matter pervading all the soft tissues. 



The main skeleton is an irregular network of coarse sandy 

 fibre, the sand particles being comparatively large, and the 

 spongin cement very scanty. There is no special dermal 

 skeleton. The spicular elements are very insignificant, and loosely 

 scattered in the soft tissues. 



Megascleres^ very slender, straight or curved strongyla, or tylota 

 with feebly developed heads, measuring abovit 0-14 by 0-0014 mm. 



