. Bulletin of the Buffalo Society of Natural Sciences. Natural history -- New York (State); Natural history. 158. FlG. 46. Polygnathus simplex, x 13 after Hinde). If is t ing u is h ing ('haracters. — Body shaped like a tenter-hook, nearly oval in sec- tion; hook pointed, opposite end smooth, pounded like an articular surface; promi- nent median ridge extending from point to opposite end. Found in the Conodont bed of the Gene- see,at Section 1 (very abundant). (Hinde.) Class Bryozoa. Ehrenberg. The Bryozoa, or Polyzoa, arc marine or fresh-water invertebrates, almost always occurring in colonie
. Bulletin of the Buffalo Society of Natural Sciences. Natural history -- New York (State); Natural history. 158. FlG. 46. Polygnathus simplex, x 13 after Hinde). If is t ing u is h ing ('haracters. — Body shaped like a tenter-hook, nearly oval in sec- tion; hook pointed, opposite end smooth, pounded like an articular surface; promi- nent median ridge extending from point to opposite end. Found in the Conodont bed of the Gene- see,at Section 1 (very abundant). (Hinde.) Class Bryozoa. Ehrenberg. The Bryozoa, or Polyzoa, arc marine or fresh-water invertebrates, almost always occurring in colonies, which increase by gemmation. Each eooid of the colony is- enclosed in a membranaceous, or calcareous, double-walled sac, the zocecium, 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 lophophore. The colony is commonly attached to foreign bodies, which it either in- crusts or from which it arises as an independent frond. In the Paheozoic 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 pseudo-septa. In the inter- apertural space may occur angular or irregular cells, the mesopores, while on many portions of the surface, tubular spines (acanthopores), 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. Macula or irregular blotches, destitute of cells, also occur in many forms. Many species bear a superficial resem- blance to certain corals, particularly the Monticuliporoids. Note.—The anatomy of recent Bryozoa (Polyzoa) may be found in the text-books of zoology. An admir
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