74 
vine: carboniferous and permian polyzoa. 
know full well that in Mr. E. 0. Ulrich I shall find, in spite of differ- 
ences of opinion on minor points, a co-worker rather than a mere 
disputant. The family name as given above, and the generic term 
Cystodictya may not be happy terms to me, seeing that I accept the 
Zocecium and its character generally, as the basis of my classification, 
and not the Zoarium, but as I have been obliged to depart from hard 
and fast lines in some of my other groupings, it may be as well to 
give way here. 
In founding the family name Cystodictyonida?, Mr. Ulrich has 
indicated the genera that may be conveniently grouped together. 
They are Cystodictya, Ulrich ; Coscinium, Keyserling ; Glyptopora, 
Ulrich ; ( = Coscinium, Prout) ; Prismopora, Hall ; and Evactino- 
pora, Megk and Worthern ; and he suggests that probably other 
genera may ultimately be included in the Family. In our own Car- 
boniferous Rocks we have not this wealth of generic forms, and in all 
probability only the following will find a resting-place here. 
I. Cystodictya (Sulcoretepora) parallela, and raricosta. 
II. Goniocladia cellulifera Eth. Jun. 
Genus Cystodictya, Ulrich. 
1829-36. Flustra? Phillips. Geol. Yorkshire, p. 200. 
1843-54. Sulcoretopora (pars) Morris and D'Orbigny. 
1882-83, Arcanopora,. Vine. 4th Brit. Assoc. Rep. Foss. Polyzoa. 
1882-84. Cystodictya, Ulrich. Jour. Cincin. Soc. Nat. Hist. 
Generic characters. Zoaria composed of two layers of cells : 
branches compressed, dividing dichotomously or at right angles, 
transverse section acutely elliptical, and sub-parallel, with sharp, non- 
poriferous margins. Zooecia tubular (in section), superficially 
arranged in longitudinal series, from three to seven rows in the 
branch ; vestibular apertures round or oval, occasionally with a 
crescentic lip on the lower margin. 
I have diagnosed the above genus with an eye to British, rather 
than to iVmerican examples, and I have adopted as much of Mr. 
Ulrich's description as would apply to these more particularly. The 
type species of the author is (7. occellata Ul. Sub-Carboniferous Rocks, 
Kentucky. 
I, Cystodictya parallela, Phillips. PI. iii., figs. 1-13, pi, iv., figs. 
18-26. 
