SPONGES 149 



*Siphonia, Park. [Cret], (Fig. 27) ; *Jerea, Lamx. [Cret.] ; *Polyjerea, 

 From. [Cret] ; *Bolospongia, Hinde [Cret] ; *Astrocladia, Z. [Cret] ; 

 *Thecosiphonia, Z. [Cret] ; *Calymmatina, Z. [Cret] ; *Turonia, Mich. 

 [Cret] ; *Kalpinella, Hinde [Cret] ; * ITiamnospongia, Hinde [Cret] ; 

 *Pholidocladia, Hinde [Cret] ; *Ragadinia, Z. [Cret] ; *Plinthosella, Z. 

 [Cret] ; * Phymaplectia, Hinde [Cret] ; *Rhopalosponyia, Hinde [Cret] ; 

 *8pongodiscus, Z. [Cret] ; *Stuckenbergia, Tscliern. [Garb.]. [FAMILY 

 ARCHAEOSCYPHIDAE, Rauff] ; *Archaeoscijphia, Hinde [Cambr.]. [FAMILY 

 CHIASTOCLONELLIDAE, Rauff] ; *Chiastoclonella, Rff. [Sil.]. 



[SUB-TRIBE ONCHOCLADINAE, Rauff.]. [FAMILY AULOCOPIDAE, Rauff]; 

 *Aulocopium, Oswald [Sil.] ; * Dendroclonella, Rff. [Sil.]. 



FAMILY 2. DESMANTHIDAE, Tops. With tetracrepid desmas of one 

 kind, either monocrepid or tetracrepid ; no microscleres ; the ectosomal 

 megascleres monactinal, rendering the outer surface hispid. Genera 

 Desmanthus, Tops. ; Monocrepidium, Tops. FAMILY 3. fCoRALLiSTiDAE, 

 Soil. [ = RHIZOMORINA, Z., pars]. The desmas monocrepid and tuber- 

 culate. Genera jCorallistes, O.S. [Eoc.] ; Macandrewia, Gray ; Dae- 

 dalopelta, Soil. ; Heterophymia, Pom. ; Callipelta, Soil. FAMILY 4. 

 IPLEROMIDAE, Soil. [ = MEGAMORINA, Z.]. The desmas monocrepid and 

 smooth. Genera Pleroma, Soil. ; jLyidium, O.S. [Eoc.] ; *Placonella, 

 Hinde [Jur.] ; * Megalithista, Z. [Jur.] ; *Dorydesmia, Z, [Cret] ; *Caster- 

 ella, Z. [Cret] ; *Holodictyon, Hinde [Cret] ; *Pachypoterion, Hinde 

 [Cret] ; *Heterostinia, Z. [Cret] ; * Nematrinion, Hinde [Cret] ; *Iso- 

 raphinia, Z. [Cret]. 



Demus /3 Rhaldosa, Soil. The ectosomal spicules are microrhabdi, 

 or modifications of them (discs). Desmas monocrepid. 



FAMILY 5. NEOPELTIDAE, O.S. Ectosomal spicules monocrepid discs. 

 Genus Neopeltis, O.S. FAMILY 6. SCLERITODERMIDAE, Soil. Ectosomal 

 spicules microrhabdi ; other microscleres sigmaspires. Genera Sclerito- 

 derma, O.S. ; Aciculites, O.S. FAMILY 7. CLADOPELTIDAE, Soil. Ectosomal 

 spicule a monocrepid desma, highly branched in a plane parallel to the 

 surface ; no microscleres. Genus Siphonidium, O.S. 



TRIBE 2. ANOPLIA, Soil. 



No ectosomal spicules or microscleres. 



FAMILY 8. f AZORICIDAE, Soil. [ = RHIZOMORINA, Z., pars.]. Desmas 

 monocrepid. Genera Azorica, Crtr. ; Tretolophus, Soil. ; Gastrophanella, 

 O.S. ; Setidium, O.S. (Fig. 28, A); Poritella, O.S. ; Amphibleptula, O.S. ; 

 Tremaulidium, O.S. ; Leiodermatium, O.S. ; Sympyla, Soil. ; Petromica, 

 Tops. 



[TRIBE POECILOCLADINIDAE, Rff.] 

 [SUB-TRIBE ANOMOCLADINAE, Rff.] 



FAMILY 9. IANOMOCLADLDAE, Z. Genera jVetulina, O.S. [Eoc.], (Fig. 

 29) ; *Cylindrophyma, Z. [Jur.] ; *Melonella, Z. [Jur.] ; *Scytalia, Z. [Jur. 

 Cret] ; *Lecanella, Z. [Jur.] ; *Mastosia, Z. [Jur.]. [FAMILY ANOMO- 

 CLONELLIDAE, Rff.]. *Anomoclonella, Rff. [Sil.] ; *Pycnopegma, Rff. [Sil.]. 



