BRYOZOA. 687 



which he relied. Now, however, since it is known that Hall's 

 diagnosis and figures are incorrect in precisely those features 

 upon which d'Orbigny founded the genus, it is evident that Sub- 

 retepora must drop out of sight once more, on the ground of 

 insufficient and incorrect definition. According to our view, it 

 is neither safe nor proper to found genera upon someone else's 

 figures or descriptions, particularly if these were drawn or writ- 

 ten in the '40s, when palaeontological work was not done nearly 

 so accurate as is now demanded. Nor can we regard it as good 

 policy to resurrect old and obscure names, especially when they, 

 like those under consideration, have never been current in palae- 

 ontological literature. Indeed, so far as we are informed, none 

 of the genera of Bryozoa proposed by d'Orbigny for species 

 described by Hall in Vol. I. of the New York Reports on Palae- 

 ontology, have been used by subsequent writers. They do not 

 even appear in catalogues like Bigsby's "Thesaurus Siluricus." 

 Enallopora. Subretepora, and Sukopora (founded upon Hall's 

 Stictopora fenestrata, which, for the present we regard as the 

 type of Stictopora), were known to us since March, 1880, but 

 we placed them, in accordance with what seemed to be common 

 consent, among the "not recognized" names. 



The THAMXISCID.E, including Crisinella, Diplopora, and Tham- 

 niscus. is not a natural assemblage. Xor does Mr. Miller ap- 

 pear to have had much faith in the group, since Diplopora oc- 

 curs among the genera of his ACANTHOCLADHD.E, and Crisinella 

 is the type of his CRISINELLHXE. Tbanmiscus, the only genus re- 

 maining is, as we have shown on pages 357 and 606 of this 

 volume, too clearly related to Polypora to permit of greater 

 than generic separation. 



The TKEMATOPORID.E includes a very peculiar and unnatural 

 assemblage of genera, showing in a striking manner the incon- 

 sequence of those authors who deny that Monticulipora, Mono- 

 trypa. Stenopora, etc.. are Bryozoa. Thus, Mr. Miller places 

 here besides Acantboclema, Bactropora, Xemataxis and Tropi- 

 dopora, which he has arranged much more properly also with 

 the RHABDOMESONTID.E; and Amplexopora and Atactopora which 

 the reader will find also under the AMPLEXOPORID.E; and Cbilo- 

 trrpa'which has been already correctly placed with the FISTULI- 



