340 



BULLETIN 11, UNITED STATES NATIONAL MUSEUM. 



some future student be able to discover these types, and from their 

 study give a clear idea of the forms, unrecognizable at present, the 

 generic and specific names, according to the rules of nomenclature, 

 will date from his work, and should synonyms of species herein 

 described be discovered, the standing of the latter will not be invali- 

 dated. For the sake of convenience, these unrecognizable genera 

 and species are discussed in alphabetical order. In the following 

 notes reference is also made to genera and species from the Russian 

 Ordovician deposits incorrectly placed in the Bryozoa, or worth 

 mentioning for other reasons. 



Genus ARCHEOPORA Eiehwald. 



Archeopora'Eicnw ajjD, Lethsea Rossica, voL 1, 1860, p. 405. 



The eight species described under this genus by Eiehwald range in 

 time from the Ordovician to the Carboniferous, and undoubtedly 

 embrace a number of generic types. No type species is mentioned, 

 and the first species, Archeopora lamella may be accepted as the geno- 

 type. The generic character, according to Eiehwald, is that the 

 bryozoan consists of a single incrusting, calcareous layer, made up of 

 circular cells [zooecia] isolated from each other by minute pores 

 [mesopores]. Such a zoarium and arrangement of zooecia and meso- 

 pores occurs in a number of genera, and, without further data, the 

 genus is unrecognizable. 



ARCHEOPORA LAMELLA Eiehwald. 



Text fig. 214. 



Archeopora lamella Eichwald, Lethsea Rossica, vol. 1, 1860, p. 405, pi. 24, figs. 

 17, 18. 



The description of this species contains no characters of any value 

 other than that the zoarium is incrusting with the cells rounded and 

 separated from each other by minute pores. Eichwald's figures are 



Fig. 214.— Archeopora lamella. Eichwald's views of his TTPE-SPEaMENS, one (a and 6, natural 



SIZE AND ENLARGED) SHOWING MESOPORES, AND THE SECOND (C AND d) APPARENTLY WITH SOUD 

 INTERZOCECIAL SPACES. 



here reproduced, but without knowing the particular horizon and lo- 

 cality of the originals, and the amount of magnification, none of which 

 is given, one can hardly even make a guess as to the species. 



