212 MISS I. B. J. SOLLAS OX THE [June 17y 



The specimen is bottled with two specimens ( J & $ ) of a 

 decapod crustacean without remai'k, presumably they were found 

 sheltering under it. 



7. Reniera sp. 



Sponge tubular, creej)ing, branching and again anastomosing,, 

 swollen at intervals where it beai-s oscula of about 2 mm. in 

 diameter. Pores lai'ge, conspicuous, and fairly evenly distributed. 



The skeleton is rather irregular, with multispicular strands 

 connected by a network which is not at all uniform, being either 

 uni- di- or tri-spiculai'. The multispicular fibi-es raise the dermal 

 membrane into minute conuli. 



The tissues are permeated with black pigment-containing cells,, 

 which have a number of refractive gi-anules over their svirfaces. 



Oxeas 0-14 X 0-007 mm. 



Pulau Bidang. 



8. Gellius centrangulatus, n. sp. (Plate XY. fig. 6.) 



Sponge massive, fragile, attached by a broad surface. Dermal 

 membrane easily removed. Oscula (?) in rows. 



Skeleton a i-egular unispicular netwoi'k with rather abundant 

 yelloAv-bi-own spongin at the nodes. The spongin occasionally 

 completely invests the spicules of the net. Hei-e and there multi- 

 spicular sti'ands occuv. 



The interest of the species lies in its microscleres : besides sigmata 

 of the usual foi'm it possesses others with a central bend giving 

 them an appearance very like that of a centi'actinate sigma that 

 may perhaps be termed centiungulate (PI, XY. £g. 6). These 

 cmious bow-like sigmata recur in G. sagittariios (PI. XY. fig. 7) ^ 



Oxeas 0'22 X 0-007 mm. The oxeas show frequent abnormality 

 in that they bear latei-al branches. 



Sigmata 0-016-0-0195 mm. Centrangulate sigmata 0'0195 mm. 



Great Redang. 



9. Geelius SAGITTARIUS, 11. sp. (Plate XY. fig. 7.) 



Sponge attached, consisting of a more dense basal part and of 

 numerous slender tubes arising from this. 



In one specimen these tubes anastomose ; in the second they are 

 broken ofi" and show no indication of how they were ai-ranged. 



Skeleton a more or less irregular netwoi-k of oxeas, becoming- 

 especially so in the lower part of the sponge, where the ari-ange- 

 ment of spicules is almost halichondroid. 



Oxeas 0-3-0-35x0-01-0-013 mm. 



Abnormalities among the oxeas are striking by their frequency. 

 They consist in the possession of small branches at one end of the 

 spicule, sometimes a single one is borne laterally, or there may be 

 3 or 4 or more pointing in various directions or forming a regular 

 tuft. 



1 Since this paper was read the translation of Lundbeck's essay on the Sponges 

 of the Danish Ingolf Expedition has appeared. Similar sigmata are there figured 

 and described in GeUins luridus, n. sp. 



