1886.] POSITION AND CLASSIFICATION OF SPONGES. 577 



2, Subfamilia Uteince, Lendenfeld. 



With simple unbraached ciliated ciiambers, the distal'ends of which 



are imbedded in a continuous cortex. Grantessa, Lendenfeld, JJte, 



Polejaeff, and Amphoriseus, Polejaeff, and those subgenera of the 



SyconidsD in Hackel's system which terminate with the syllable 



3. Subfamilia Grantince, Lendenfeld. 

 With branched ciliated chambers. 

 Grantia, Heteropegma, and Anamixilla, Polejaeff. 



5. Familia Sylleibid^, Lendenfeld. 

 With comphcated exhalant canals, leading from the cylindrical 

 ciliated chambers into the gastral cavity. 



1. Subfamilia Vosmaerince, Lendenfeld. 



The ciliated chambers are radially situated, and form a regularly 

 cylindrical zone. They are connected with the gastral cavity by a 

 network of anastomosing exhalant canals. 



Vosmneria, Lendenfeld, and Leucetta, Polejaeff. 



2. Subfamilia Polejnce, Lendenfeld. 



The ciliated chambers form a much-folded layer. The exhalant 

 canals are wide, and do not anastomose to form a reticulation. 



The genera Polejna, Lendenfeld, and Leucilla, Polejaeff, consti- 

 tute this group. 



6. Familia Leuconid^, Hackel. 



Heterocoela with ramified canal-system and spherical ciliated 

 chambers. 



Leucetta, Leucissu, Leucaltis, Leucortis, Leuculmis, and Leu- 

 candra, Hackel. Leuconia, auctorum, and Leuconia and Perieharax, 

 Polejaeff. 



7. Famiha Teichonid^, Carter. 



Heterocoela without gastral cavity. The inhalant pores are 

 situated on the one, and the exhalant on the other side of the 

 lamellar sponge ; with spherical ciliated chambers. 



Teichonella, Carter, and Eilhardia, Polejaeff. 



IL Subclassis SILICBA, nov. 



Sponges with a skeleton com])oseil of siliceous spicules and their 

 derivatives ; possessing a horny skeleton or no skeleton at all, but 

 never supported by calcareous spicules. 



Comprises the Non-Calcarea of Grant and other authors. 



I. Ordo HEXACTLNELLIDA, O. Schmidt. 



Silicea with triaxon spicules and soft mesoglcea. Strengthened by 

 siliceous cement, generally joining the spicules. 



Proc. Zool. Soc— 1886, No. XXXVIIL 38 



