the ^Challenger'' Monaxonida. 331 



rectangular, with much spongiii and a few spicules ; fibre, 

 typically thin, with a single axial series of spicules. 



Ghallna rectangularis^ n. sp. 



Incrusting, thin, with low mound-like prominences, each 

 bearing a vent. Pale yellow. Texture compact but com- 

 pressible and elastic. Surface subglabroas. Vents small. 

 Skeleton : — (a) dermal, a polygonaily, small-meshed reticula- 

 tion of spiculo-fibre,polyspiculous, with little spongIn,echinated 

 by tufts of spicules ; {b) main, a very regular rectangular 

 reticulation of strong polyspiculous spiculo-tibre, with much 

 spongin completely enveloping it, thickness '0(3 millim. 

 Spicules short, stout, abruptly sharp- pointed acerates ; size 

 •088 by -009 millim. 



Locality. Station 208, Philippine Islands, 18 fath. 



Genus SiPHONOCHALlNA (Schmidt). 



Tubular. Tubes smooth inside and out, usually narrow,, 

 each with a round oscular opening at summit. 



Siphonochalina intermedia *, n. sp. 



Bushily ramose ; branches stout, short, sometimes anasto- 

 mosing. Greyish yellow. Soft and spongy, but tough and 

 fibrous. Surface glabrous. Skeleton : — («) main, a regular 

 rectangular network of spiculo-fibre ; fibre rather slender, 

 with much spongin, cored by polygonaily arranged spicules ; 

 thickness of fibre about '032 millim. ; also scattered spicules : 

 {h) dermal, a very delicate reticulation of spiculo-fibre, with 

 much spongin and uniserially arranged spicules. Spicules 

 slender acerates, rather abruptly pointed, up to "1 millim. long 

 and -006 thick. 



Locality. Port Jackson, 7-8 fath. 



Siphonochalina annulata *, n. sjd. 



Kooted, stipitate, ramose. Branches long, distinctly annu- 

 lated, often anastomosing ; stem short and slender. Soft and 

 spongy, but tough and fibrous. Surface glabrous. Skeleton : — 

 {a) dermal, a reticulation of rather stout spiculo-fibre 

 with much spongin, echinated by tufts of spicules ; [b) 

 main, a feebly developed subrectangular reticulation of 

 spiculo-fibre, '07 millim. thick, cored by polyserial spicules. 

 Spicules subfusiform acerates, sharply and rather gradually 

 pointed ; size '1 by "0065 millim. 



Locality. Station 162, Bass Straits, 38 fath. 



* Specitic name given by Dr. v. Lendenfeld in MS. Catalogue. 



