350 
vine: classifications of cyclostomatous polyzoa. 
case where it was possible for him to do so, reference has been made 
to species of fossils found in the Cretaceous, and also in the Jurassic 
rocks, in the neighbourhood of Caen ; and the celebrated Maastricht 
beds, so ably illustrated by the labours of Lamouroux, Goldfuss, 
Haime, D'Orbigny and Hagenow. Since then, however, many of the 
beds of the horizons named have been reworked by Dr. Pergens and 
A. Meunier, and the whole of D'Orbigny's species have been critically 
examined by Dr. Pergens, and I have not the least doubt, but that 
many suggestions will be forthcoming, when he arranges his notes 
for publication. As it is, I can only deal with published papers, and 
in several of these I find certain conclusions arrived at by the author 
in his critical studies, which will have to be considered before a final 
arrangement of the Cyclostomata can be made. Thus, in their 
joint paper on " New Bryozoa of the Upper Cretaceous,"* (or Mais- 
tricht Beds), the authors establish a new family, and three new 
genera, for the reception of a peculiar group of Polyzoa ; and 
in other papers several of the almost obselete genera, of D'Orbigny, 
have been consistently revived. The new Family, Cameraporid^, 
the authors place in the " Centrifugines de D'Orbigny, division des 
Tubulines," and the new Genera, are called respectively Cumerapom 
(one species) ; Clausacamerapora (one species and variety) ; and 
Curvacamerapora, also one species. 
From all this it may be gleaned that although much has been 
done by the authors who have succeeded Busk and Smitt, much still 
remains to be done, even with the proper classification of the 
Mesozoic Cyclostomata, let alone the Pahieozoic gTOups, which are 
now being so elaborately illustrated by Mr. E. 0. Ulrich, Pala3ontologist 
of one of the United States Geological Surveys. 
All that I shall attempt, then in this paper, is to place before 
the student of our Fossil Polyzoa, the classification of the Cyclosto- 
mato adopted by the several authors already mentioned, so that he 
may be able to judge of their relative, or suggestive value. 
The classification of the Jurassic Bryozoa, by Jules Haime,"- is 
a very simple affair : all his species — excepting two — are placed in 
* Memories de la Soc. Roy. Malacologeque de Belgique Tome xx., 1885. 
t Jaraesic Bryozoa, 1854. 
