CLASSIFICATION. 
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III. — CLASSIFICATION. 
Sollas (22) gives tlie following classification : — 
Subkingdom. PARAZOA. 
Phylum. SPONG12E. 
Class I. MEGAMASTICTORA. 
Subclass. CALCAREA. 
Class II. MICROMASTICTORA. 
Subclass 1. MYXOSPONGIJE. 
Subclass 2. HEXACTINELLID^E. 
Subclass 3. DEMOSPONGLE. 
Tribe a. MONAXONIDA. 
Order i. Monaxona. 
Order n. Ceratosa. 
Tribe «. TE TRA CTINELLIDA . 
Order i. Choristida. 
Suborder 1. Sigmatophora. 
Family i. Tetillidce. 
Family ii. Samidce. 
Suborder 2. Astrophora. 
Demus a. Streptastrosa, n. n. 
Family i. Theneidce. 
Family ii. Pachastrellidce. 
Demus n. Euastrosa. 
Family i. Stelettidce. 
Appendix. Epipolasidce ?. 
Demus c. Sterrastrosa. 
Family i. Geodiidce. 
Family ii. Placospongidce. 
Suborder 3. Microsclerophora. 
Family i. Placinidce. 
Family ii. Corticida. 
Family iii. Thrombidce. 
Order n. Lithistida (0. Schmidt). 
Suborder 1. Hoploprora. 
Demus a. Trisenosa. 
Family i. Tetracladidm ( Tetracladina , Zittel). 
Family ii. Corallistidce ( Rhizomorina , Zittel). 
Family iii. Pleromidce- ( Megamorina , Zittel). 
Demus b. Rhabdosa. 
Family i. Neopeltidce. 
Family ii. Scleritodermidce. 
Family iii, Cladopeltidce. 
Suborder 2. Anoplia. 
Family i. A zoricidm (Rhizomorina, Zittel). 
Family ii. Anomocladidcti (Anomocladina, Zitt.). 
