ANT.] 



PROTOZOA. 



153 



into a calcareous fossil, the spiculse will disappear in the coarser lime materials. A 

 possible exception might exist if, in the process of change, the interior of the sponge 

 were converted into calcspar. The spiculse, therefore, are of importance in the de- 

 termination of genera and species among Palaeozoic sponges, only when silicified 

 specimens can be obtained. 



The arrangement of the Palaeozoic sponges into families is as follows : . 



FAMILY ANTHASPIDELLID.E. Anthaspidella, Climacospongia, Edriospongia, 



Strep tosolen, Zittelella. 



FAMILY ARCELEOCYATHID.E. Archseocyathus, Ethmophyllum. 

 F AMIL Y ASTR^EOSPONGID^E. Astrseospongia. 

 FAMILY ASTYLOSPONGID^:. Astylospongia, Aulocopina, Calathium, Conop- 



terium, Cyathospongia, Eospongia, Palseomanon, Palaeospongia, Trachyum, 



Trichospongia. 



FAMILY BEATRICIIXE. Beatricea. 



FAMILY BRACHIOSPONGID^E. Brachiospongia, Chirospongia. 

 FAMILY DICTYOSPONGID^:. Cleodictya, Cyathophycus, Dictyophyton, Ec- 



tenodictya, Lyriodictya, Phragmodictya, Physospongia, Protospongia, 



Rauffella, Rhombodictyon, Thamnodictya, Uphantsenia. 



FAMILY DYSTACTOSPONGIDJE. Dystactospongia, Heterospongia, Saccospongia. 

 FAMILY LEPTONITID.E. Leptonitus. 

 FAMILY MICROSPONGID.E. Hindia, Microspongia. 

 FAMILY PAL^EACID^E. Palseacis. 

 FAMILY PASCEOLID^E. Pasceolus. 

 FAMILY PATTERSONIID.E. Pattersonia. 

 FAMILY PHARETRONES. Batospongia, Camarocladia, Cylindrocoalia, Strepto- 



spongia. 



FAMILY RECEPTACULITLD^E. Cerionites, Receptaculites. 

 FAMILY STROMATOPORID^,. Caunopora, Ccenostroma, Cryptozoon, Dictyo- 



stroma, Megastroma, Strephochetus, Stromatocerium, Stromatopora, Sy- 



ringostroma. 

 FAMILY AFFINITY UNCERTAIN. Astroconia, Fungispongia, Lepidolites, Lep- 



tomitus. 



ANTHASPIDELLA, Ulrich& Everett, (in press,) 

 Geo. Stir. 111., vol. 8, p. 256. [Ety. 

 anthos, flower ; aspis, shield ; ellus, di- 

 minutive.] Saucer or funnel-shaped, 

 supported by a short, subcylindrical 

 stem; inosculating, radiating channels 

 numerous, and those on the upper sur- 

 face form radical canals that pass 

 through the sponge-wall, and open into 

 the channels of the lower surface; 

 radiating canals closely arranged in ver- 

 tical series, separated by vertical sheets 

 of spicules ; oscula on the upper sur- 

 face ; spicules bifid at each end, the 

 bifurcations directed nearly at right an- 

 gle, and slightly curving, and so ar- 

 ranged as to leave minute canals of tri- 

 angular, quadrate, or polygonal form ; 

 surface sometimes covered with a der- 

 mal layer. Type A. mammulata. 



fenestrata, Ulrich & Everett, (in press,) 

 Geo. Sur. 111., vol. 8, p. 264. Trenton Gr. 



firma, Ulrich & Everett, (in press,) Geo. 

 Sur. 111., vol. 8, p, 263, Trenton Gr. 



florifera, Ulrich & Everett, (in press,) Geo. 

 Sur. 111., vol. 8, p. 259, Trenton Gr. 



grandis, Ulrich &Everettj (in press,) Geo. 

 Sur. 111., vol. 8, p. 262, Trenton Gr. 



magnifica, Ulrich & Everett, (in press,) 

 Geo. Sur. 111., vol. 8, p. 265, Tren- 

 ton Gr. 



mammulata, Ulrich & Everett, (in press,) 

 Geo. Sur. 111., vol. 8, p. 258, Trenton Gr. 



obliqua, Ulrich & Everett, (in press,) Geo. 

 Sur. 111., vol. 8, p. 265, Trenton Gr. 



parvistellata, Ulrich & Everett, (in press,) 

 Geo. Sur. 111., vol. 8, p. 260, Tren- 

 ton Gr. 



scutula, Ulrich & Everett, (in press,) Geo. 

 Sur. 111., vol. 8, p. 261, Trenton Gr. 



