THE ANNALS AND MAGAZINE OF NATURAL HISTORY, [FIFTH SERIES.] No. 58. OCTOBER 1882. XXV. — Embryogeny of the Bryozoa ; an Attempt at a General Theory of their Development, founded upon the Study of their Metamorphoses. By Dr. Jules BARROIS *. [Plate XIV.] The present memoir is in continuation of my investigations upon the Escharina, already published f. All the great families of the Bryozoa have been in the same way subjected to observation from the point of view of the metamorphosis ; and it is the general conclusions of these investigations that I now publish, in anticipation of the detailed memoirs which must follow that on the Escharina, and which will appear hereafter upon each of the families. 1. The documents published upon the development of the group Bryozoa have hitherto been completely silent upon an essential point of their embryogeny. We know well how the various free larvae to which the egg gives birth are formed and developed, and we also know how, from the very simple stage which follows the destruction of these first states, the defini-tive cell is gradually fashioned ; but all our knowledge proves * Journal de l'Anatoniie et de la Physiologie, 1882, pp. 1-34. Trans-lated by W. S. Dallas, F.L.S., from a separate copy communicated by the author. •j-Ann. Sci. Nat. 6 e serie, tome ix. Ann. & Mag. N. Hist. Ser. 5. Vol. x. 18
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