176 M, E. Hiickel's Prodromus of XVIII. — Prodromus of a System of the Calcareous Sponges. By Ernst Hackel t-Note. — J. = Johnston. Bb. = Bowerbank. 0. S. = Oscar Schmidt. M.-M. = Miklucho-Maclav. H. = Hackel. An * before the name of a genus or species indicates that it is new. Legion CALCISPONGI^, Blainville. (Synonjms : Grantioiy Flenling ; SjJongke caJcarece^ Bower-bank.) Sponges with a skeleton composed of carbonate of lime. Order I. MONOSYCA, H. Character. Hie mature calcareous sponge forms a single person with a single mouth-opening. (Body usually cylindrical, fusiform, or ovate, not branched. Stomachal cavity [inner cavity of the body] simple or chambered, always with a sim-ple mouth-opening placed opposite to the point of adhesion.) Family I. Prosy cida, H. Character. The mature calcareous sponge forms a simple sac-like person, furnished with a single mouth-opening, the body-wall (stomachal wall) of which is quite solid, and not perforated. Genus 1. *Peosycum, nov. gen. Gen. char. Mouth-opening simple, without any peristomial crown (without a circlet of projecting spicules). Two species. l.*P. simplicissimmn ^ H. Naples (H.). 2. *P. primordiale^ H. Naples (H.). Family II. OlyntMda, H. Character, The mature calcareous sponge forms a simple sac-like person furnished with a single mouth-opening, and the body-wall (stomachal wall) of which is perforated only by simple cutaneous pores. (The cutaneous pores are simple in-terstices in the parenchyma, without any special lining.) Genus 2. *Olynthus, nov. gen. Gen. char. Mouth-opening simple, without any peristomial crown (circlet of freely projecting spicules). Five species. 3. * 0. simplex, H. Naples (H.). t Translated from the * Jenaische Zeitschrift,' Band v. pp. 236-254, by W. S.Dallas, F.L.S.
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