1886. ] POSITION AND CLASSIFICATION OF SPONGES. 577 
2. Subfamilia Uteine, Lendenfeld. 
With simple unbranched ciliated chambers, the distal’ends of which 
are imbedded in a continuous cortex. Grantessu, Lendenfeld, Ute, 
Poléjaeff, and Amphoriscus, Poléjaeff, and those subgenera of the 
Syconide in Hiackel’s system which terminate with the syllable 
“usa.” 
3. Subfamilia Granting, Lendenfeld. 
With branched ciliated chambers. 
Grantia, Heteropegma, and Anamiwilla, Poléjaeff. 
5. Familia SyLLErBip#, Lendenfeld. 
With complicated exhalant canals, leading from the cylindrical 
ciliated chambers into the gastral cavity. 
1. Subfamilia Vosmaerine, 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. 
Vosmaeria, Lendenfeld, and Leucetta, Poléjaeff. 
2. Subfamilia Polejne, 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, Poléjaeff, consti- 
tute this group. 
6. Familia Leuconip#, Hiickel. 
Heteroccela with ramified canal-system and spherical ciliated 
chambers. 
Leucetta, Leucissa, Leucaltis, Leucortis, Leuculmis, and Leu- 
candra, Hickel, Leuconia, auctorum, and Leuconia and Pericharaz, 
Poléjaeff. 
7. Familia TercHonip2, Carter. 
Heterocceela 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 Hilhardia, Poléjaeff. 
II. Subclassis SIZICEA, nov. 
Sponges with a skeleton composed 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. 
1. Ordo HEXACTINELLIDA, O. Schmidt. 
Silicea with triaxon spicules and soft mesoglea. Strengthened by 
siliceous cement, generally joining the spicules. 
Proc. Zoou. Soc.—1886, No. XXXVIII. 38 
