TABLE OF DOUBTFUL SPECIES. 



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Table II. — List of Bad and Doubtful Species in Alphabetical Order. 



Acanthospongia siluriensis, Salter 



Astylospongia grata, Salter, MS 



Bothroconis plana, King 



Cnemidium tenue, Lonsdale 



Coscinopora placenta, Lonsdale 



Entobia (Cliona) antiqua, Portlock 



Favospongia Buthveni, Salter, MS 



Ischadites micropora, Salter 



Mammillopora mam miliaria, King 



Palseacis cuneata, Meek and Worthen sp 



Protospongia diffusa, Salter 



Pflabella, Hicks 



— ? major, Hicks 



— ludensis, Holl 



— maculseformis, Holl 



Pulvillus Thomsonii, Carter 



Scyphia tuberculata, King 



— turbiaata, Lonsdale 



Spbserospongia bospitalis, Salter 



Steganodictyum Carteri, 31' Cog 



— cornubicum, M'Coy 



Tragos Binney i, King 



semicirculare [is], M'Cog 



— Tunatallensis, King 



Verticillopora abnormis, Lonsdale 



— dubia, M'Cog 



— palmata, Salter 



Vioa (Cliona) prisca, M'Coy 



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It will be seen from the foregoing list that in all fifty species of fossil Sponges 

 have been enumerated from the Pakeozoic strata of the British area. The numbers 

 of species of each of the principal groups of Sponges are as follows : — Monactinel- 

 lidas twelve, Tetractinellidas seven, Lithistida? five, Hexactinellidae seventeen, 

 Octactinellidge two, Heteractinellidge six, and Calcispongias one species. 



Prom the Cambrian strata there are at present three species known, all of 

 which are Hexactinellids : from the Ordovician five species, two of which are 

 Lithistids and three Hexactinellids ; from the Silurian ten species, of which one 

 belongs to the Monactinellidse, eight are Hexactinellids, and one an Octactinellid ; 

 from the Carboniferous thirty-three species, of which eleven are Monactinellids, 



