VINE: NOTES ON FOSSIL POLYZOA. 
389 
In my description of all the above fossils I have preferred to use 
the terms — Corallum, Corallites, and Calices — used by Prof. Nichol- 
son in his descriptions of the Monticuliporidse. I have no desire, 
however, to prejudice any investigator as to whether the Monticuli- 
poridse belongs to the Polyzoa or to the Coelenterata. I have asked 
Prof. Nicholson whether his opinions on this point are changed since 
the publication of the work on the " Genus Monticulipora," or in 
any ways affected since the publication of the later researches of 
Mr. E. 0. Ulrich ? He assures me in a letter that they have not, 
that he still adheres to the belief that the Monticuliporidse are Coel- 
enterata ; and for the present I must be forgiven if I sin on the 
same side, though I will admit that we sin against very competent 
authority on the opposite side. 
Additional notes on rare species of Carboniferous Polyzoa found 
in the Yorkshire shales. 
See Notes on the Carboni''erouR Polyzoa of North Yorkshire, 1882; Notes on the 
Carb. Polyzoa of W. Y'orksbire and Derbyshire, 1884; Papers published 
in the Jour. Yorkshii-e Geological and Polytechnic Soc, Dates above. 
Family Rhabdomesontid^, Vine. 
Fourth report on Fossil Polyzoa (Vine), Brit. Assoc. Reports, 
1883. American Palaeozoic Bryozoa, Ulrich — Jour. Cincin. Soc. 
of Natural Hist., April, 1884. 
In the American work cited above, Mr. E. 0. Ulrich has adopted 
the family name Rhabdomesontidae, and he has included with the 
Genus Rhahdomeson, Young, that of Rliomhoiwra, Meek, and in all 
probability he will associate with it the Genus Aiiisotrypa, Ulrich. 
I am rather glad of this, because the association enables me to place 
in the family several obscure fossils — not abundant — but present in 
our North Yorkshire and Scotch shales, which have heretofore been 
placed in doubtful company. 
Rhombopoea, Meek, 1871. 
" Zoai'ium ramose, branches slender. Zosecia tubular, radiating in 
all directions from an imaginary axis ; walls abruptly thickened in 
the " matured " region, where the diameter of the visceral cavity is 
also more or less constricted. Zoa^cial apertures circular or oval, 
placed at the bottom of more or less obviously impressed, sloping 
