. Bulletin of the Buffalo Society of Natural Sciences. Natural history; Science. 158 D is t iuii- u is h in g Cliarncters. — Bod y shaped like a tenter-hook, nearly oval in sec- tion ; hook pointed, opposite end smooth, ronnded like an articular surface; promi- nent median ridge extending from point to opposite end. ( f^' ILJfei^f""x'1'3 Found in the Conodont bed of the Gene- after Hinde)".' ^^^^ .^ ^ Section 1 (very abundant). (Hiude.) Class Bryozoa. Ehrenbekg. The Bryozoa, or Polj'zoa, are marine or fresh-water invertebrates, ahnost always occurring in colonies, which increase
. Bulletin of the Buffalo Society of Natural Sciences. Natural history; Science. 158 D is t iuii- u is h in g Cliarncters. — Bod y shaped like a tenter-hook, nearly oval in sec- tion ; hook pointed, opposite end smooth, ronnded like an articular surface; promi- nent median ridge extending from point to opposite end. ( f^' ILJfei^f""x'1'3 Found in the Conodont bed of the Gene- after Hinde)".' ^^^^ .^ ^ Section 1 (very abundant). (Hiude.) Class Bryozoa. Ehrenbekg. The Bryozoa, or Polj'zoa, are marine or fresh-water invertebrates, ahnost always occurring in colonies, which increase by gemmation. Each zomd of the colon}' is enclosed in a membranaceous, or calcareous, double-walled sac, the zoo'cium, into which it can withdraw. The ani- mal possesses a mouth, an alimentary canal, and an anal opening, and, in addition to these, a fringe of respiratory tentacles — the lopliophore. The colony is commonl}' attached to foi-eign bodies, which it either in- crusts or from which it arises as an independent frond. In the Pahneozoic genera the cell apertures are often surrounded by elevated rims, or peristomes. In many forms a portion of the posterior wall of the tube is more or less thickened, and curved to a shorter radius, projecting often above the plane of the aperture. This forms the lunaria, and their ends may project into the tubes as jjseudo-septa. In the inter- apertural space may occur angidar or irregvdar cells, the mesopores, "while on many portions of the surface, tubular spines (aranthopores), or nodes (rounded, knob-like elevations), may occur. At intervals, in many genera, rounded elevations, or monticules, are found, which may, or may not, be destitute of cells. Macuke or irregular blotches, destitute of cells, also occur in maily forms. Many species bear a superficial resem- blance to certain corals, particularly the Monticuliporoids. KoTE.—The anatomy of recent Bryozoa (Polyzoa) may be found in the text-books of zoology. An admirable a
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