Catalogue of Nan- Calcareous Sponges. 249 



jMt'gasclef-es, fairly stout, slightly curved, gradually sharp- 

 pointed oxea, measuring about 0-2 by 0-00S3 mm. In the deeper 

 parts numerous very slender oxea occur between the others, of 

 which they are probably young forms. 



Micyoscleres, very numerous, short and very slender, C-shaped 

 sigmata, measuring about 0'016 mm. from bend to bend. 



This sponge is especially characterised by the very feeble 

 development of the closed fistuke, so that it makes a near 

 approach to the genus Gellius, in which they are entirely absent. 

 Both specimens were received at the same time, and though in 

 separate jars, they are probably parts of the same individual. 



R.N. 1167; 1193. 



Oceanapia imperfecta., n. sp. 



This species is represented in the collection by a squarish 

 chunk evidently cut from the upper part of a large massive 

 specimen The upper surface is flattened, subglabrous, and very 

 minutely reticulate. Ic bears numerous very small, thimble- 

 shaped, blind tistukv, with reticulate walls and only about one- 

 fifth of an inch high. Numerous long canals run up and 

 terminate in these tistuhv. The texture of the whole sponge is 

 very soft, spongy and tender. The colour in spirit is very pale 

 yellow. 



Skeleton, the main skeleton is a loose network of very 

 distinct spicular fibres, each about 0*055 mm. in diameter, and 

 composed of densely packed spicules with little or no spongin. 

 The dermal skeleton is an irregular, close-meshed, bast-like 

 network of spicule bundles, abundantly echinated by close-set 

 tufts of projecting oxea. 



Megascleres, long, slender and almost straight oxea, cylin- 

 drical and hastately pointed at each end ; measuring about 0*25 

 l)y 0-006 mm. 



I have not been able to find any microscleres. 



R.N. 1181. 



Oceanapia phillipensis, n. sp. 



The sponge consists of a massive, sessile, depressed body, 

 coated and charged with foreign matter, and sending up a number 

 of elongated, hollow fistuhe, ranging up to about tliree inches in 



B 



