788 G, R. VINE ON POLYZOA (BRYOZOA) FOUND IN 
shown in figures in Haime’s Monograph. The following diagnosis 
of the Bradford-Clay species is drawn up from some very fine spe- 
cimens. 
Zoarium incrusting, very irregular. Zowcia partially immersed, 
closely compacted, covering large spaces on shell and stone; orifice 
of cell circular, slightly raised; lip prominent, but not what may 
be called protruded; tubes finely punctured. Oecia consisting of 
a distended cell or of several cells, but not so characteristic as in 
D. ventricosa, Vine. Colony originating with a primary cell, as- 
suming a flabellate, and ultimately an irregular, outline. Rarely 
discoid in its matured or nearly matured growth. 
Richmond series, Prof. Judd, slides 3 a, 6, «. C. Moore’s (Meux 
Brewery), 1/36; slides M. 1/27 &c., 1/29 a, 6. 
Horizon and locality. Great Oolite, environs of Caen (Ranville) ; 
Bradford ; Ardennes (J. H.); “ Bath Oolite.” 
From the latter locality I had a large specimen, incrusting shell 
(Mr. Shrubsole’s cabinet); but the cells of these are less robust than 
in the Richmond and Bradford-Clay forms. The only locality I had ~ 
was ‘* Bath Oolite—from the neighbourhood of Bath.” Mr. Moore’s 
specimens are more closely allied to this form than to those from 
Richmond. 
In some of the specimens from the Richmond horizon there is a 
slight departure from the normal type, caused by peculiarities of 
habit; but as I cannot detect any departure from the characteristic 
cell-features, I have preferred not to give any new names to these. 
The slides are marked 3d and 3e. 
4, Drastopora Microstoma, Michelin. 
Berenicea microstoma, Haime, op. cit. pl. vii. figs. 3 a—d. 
D. microstoma, Vine, Brit. As. Rep. 1882, p. 256; Haime gives as 
synonyms D. undulata, of both Michelin and D’Orbigny. 
The five slides that I have mounted of this form show, I think, the 
characteristic features of this species. That marked 4a@ may very 
well serve as a type of D. undulata, but this conception of character 
would be erroneous. Asin D. ventricosa, Vine, and some specimens 
of D. diluviana, Lamx., there are several ocecia in the colony, and 
the bulgy appearance of these causes the undulations noticed by the 
respective authors. Another point of interest is that the general habit 
of the species is a proliferous one, one colony overlapping another, 
or striking off from the marginal rim of some bulky specimen, and 
then helping to cover the parent colony. The separation of the 
cells, too, in this species is very distinct, appearing as mere exten- 
sions of the peristome, while the remaining parts of the tubes are 
undistinguishable or nearly so. It is this species—or an ally of this 
species, for it may be wise at some future time to separate them— 
that forms incrustations on the stems of Entalophora, producing 
that peculiar spiral character which is generally regarded by authors 
as Tercbellaria. I have traced the form through a series of spirals, 
beginning as a mere point, and then increasing in size until very 
