SPONGES 149 



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

 From. [Cret.]; *Bolosponriu(, Hinde [Cret]; *Astrocladia, Z. [Cret.]; 

 *Thecosiphonia, Z. [Cret.] ; *Calymmatina, Z. [Cret.] ; *Turoni((, Midi. 

 [Cret.] ; *Kalpindla, Hinde [Cret.] ; *Thamnospongia, Hinde [Cret.] ; 

 *FhoUdocladia, Hinde [Cret.]; *Rmjadinia, Z. [Cret.]; *Plinthosella,.Z. 

 [Cret] ; *Phymaplectn(, Hinde [Cret.] ; *Ehopalospongia, Hinde [Cret.] ; 

 *Spon(iod{scus, Z. [Cret.] ; *Stuckenbergiay Tschern. [Carb.]. [Family 

 Archaeoscyphidae, Raulf] ; * Archaeoscyphia, Hinde [CamVr.]. [Family 

 Chiastoclonellidae, Rautf] ; *ChiastodoneIla, Etf. [Sil.]. 



[Sub-Tribe Oxchocladixae, Rauff.]. [Family Aulocopidae, Raufl']; 

 *.-lH/ocoj)iitm, Cswald [Sil.]: *DendrodoneUa, Rff. [Sil.]. 



Family 2. Desmanthidae, Tojjs. With tetracrejiid desnias of one 

 kind, eitlier monocrepid or tetracrepid ; no microsclere? ; the ectosomal 

 niegascleres nionactinal, rendering the outer surface hispid. Genera — 

 Desmaiithus, Tops. ; Monocrepidium, Tops. Family' 3. ICorallistidae, 

 Soil. [ = Rhizomorixa, Z., pars]. The desmas monocreijid and tuber- 

 culate. Genera — jCoraUistes, O.S. [Eoa] ; Macandrewia, Gray ; Lae- 

 dalopelta, Soil.; Heterophijmia, Pom.; Callipelta, Soil. Family' 4. 

 IPleromidae, Soil. [ = Meg^vjiorina, Z.]. The desmas monocrepid and 

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

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

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

 [Cret.] ; *Heterost{nia, Z. [Cret.] ; * Ncmatrinion, Hinde [Cret] ; *Iso- 

 raphinia, Z. [Cret.]. 



Demus /i — Ehahdosa, Soil. The ectosomal spicules are microrhabdi, 

 or modifications of them (discs). Desmas monocrepid. 



Family 5. Xeopeltidae, O.S. Ectosomal spicules monocrepid disc^. 

 Genus — Xeopeltis, 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. 



Xo ectosomal spicules or microscleres. 



Family 8. t Azoricidae, Soil. [ = Rhizomorina, Z., pars.]. Desmas 

 monocrepid. Genera — Azorica, Crtr. ; Tretolophus, Soil. ; Gastrophanclla, 

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

 'J'remaulidium, O.S. ; Leiodermatium, O.S. ; Sympyla, Soil. ; Petromica, 

 Tops. 



[Tribe Poecilocladixidae, Rff.] 



[Sub-Tribe Axomocladinae, RfF.] 



Family 9. IAnomocladidae, Z. Genera — fVetulina, O.S. [Eoc], (Fig. 

 29) ; *Cylindrophyvia, Z. [Jur.] ; *MeloneHa, Z. [Jur.] ; *Scyt(ilia, Z. [Jur. 

 Cret.] ; *Lecanella, Z. [Jur.] ; *Mastos{a, Z. [Jur.]. [Family Axomo- 

 clonellidae, Rtf.]. *AnomocloneUa, Rff. [Sil.]; * Pycnopegma, Rif. [Sil.} 



