Further Notes on the Polyzoa of the Lower Greensand and the Upper Greensand of Cambridge. Part II. (Plate xii.)

Abstract

At the time when I wrote the paper on the Polyzoa and Foramnifera of the Cambridge Greensand, very little information could be gleaned respecting Polyzoa from the horizons of the Gault, Chalk Marl, or Hunstanton Red Chalk, whilst from the horizon of the Cambridge Greensand no record of a Polyzoan fauna existed. Even as it is, much of our knowledge of the Cambridge Greensand Polyzoa is derived from the study of forms found attached to foreign bodies, or unattached (free) in the phosphate beds of Cambridge. As already stated in the first paper (p. 3), the fossils sent to me for examination and description, were the property of Mr. Thomas Jesson, F.G.S., so in the present case the additions to the fauna of the Cambridge horizons that I am now able to make, I owe to the same gentleman's careful scrutiny of his larger fossils, on which Polyzoan encrustations were found. In addition to these valuable collections, my own cabinet has been gradually enriched by additions of Cretaceous Polyzoa from foreign horizons, so that now I am better able to appreciate the labours of Dr. Goldfuss, Hagenow, and D’Orbigny, whose delineations of Cretaceous Bryozoa deserve our highest admiration. The works of other students, such as Beissel, Reuss, Raemer, and Simonowitsch have also increased my knowledge of the varied forms of the wide-spread Polyzoa of the Cretaceous epoch. Since 1885, too, other students have been at work on this beautiful group, notably among the rest Dr. Pergens of Belgium, who, having ...