. Bulletin - United States National Museum. Science. 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
. Bulletin - United States National Museum. Science. 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'EicnwajjD, 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
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