166 REPORT—1883. 
terms thus, we get rid of difficulties. Not a single genus has been 
founded by these various authors, which may not, under a different system 
of estimating their value, have something said in favour of its continuous 
adoption. 
I have been supplied by Mr. J. M. Nickles, of Cinncinati, with a few 
of the Cretaceous Polyzoa from Arkansas in America, and, as these 
closely resemble species found in our own strata—I may say identical with 
our own—I shall be able to give fuller details of our British Cretaceous 
fragments. 
ENTALOPHORA GRACILIS, Goldfuss. 
Ceriopora gracilis, ‘ Petrif. Germ.’ p. 35, tab. 10, fig. 11. 
Oricopora f Morris, ‘ Catalogue Brit. Foss.’ 
Ceriopora mammillosa (pars). 
a ramulosa (pars). 
The variable character of this polyzoon renders identification very 
difficult indeed. The description and figures of Goldfuss are very good, 
especially the figures, but apparently, in the diagnosis, but little regard has 
been paid to growth. In the Lower Greensand of Farringdon the species 
is very characteristic, and in all probability two or three others may be 
reduced to mere synonyms of this well-marked type. The branches of 
some of the specimens that I have in my cabinet are a half of a line in 
diameter, whilst others are about, of an inch in breadth; yet the 
superficial characters of both are the same, only in the smaller specimens 
there is a less number of cells to the transverse section. The following 
may be accepted as the diagnosis of this species. 
Zoariwm ramose, cylindrical, rounded at the apices, or growing ex- 
tremity ; varying in diameter from ,}; to ;}, of an inch. Zoccia con- 
tiguous, showing the orifices of the cells only, tubes rarely, if ever, ex- 
posed ; occasionally perfect, and, when this is the case, the surface of the 
branch is smooth, or the peristome of the cell slightly extended ; when 
worn, the cell-openings are oval, arranged in series across the branch, or, 
more correctly speaking, arranged diagonally. 
Localities. —Lower Greensand, Farringdon. Upper Greensand, War- 
minster. 
ENTALOPHORA PUSTULOSA, Goldfuss. 
Ceriopora pustulosa, Goldf. ‘ Petrif. Germ.’ p. 37, tab. 11, fig. 3. 
Pustulopora ,, Morris, ‘ Cat. Brit. Foss.’ 
Ceriopora mammillosa, ? Roem. (pars) of authors. 
Zoarium variable, sometimes clavate, at other times branching, thick 
or bulgy towards the nodes. Zowcia arranged in series—spirally—around 
the branch, about six to the line in a diagonal, five to the line, in a longi- 
tudinal direction ; cells pustulose at the orifice, peristome raised ; crowded 
at the apices. When worn, the cell~openings are elongately oval, much 
larger than in the more delicate H. gracilis. 
Localities.—Lower Greensand, Farringdon. 
The above is the description of the species generally met with in the 
Greensand of Farringdon. In the Greensand of Haldon Hill, Devon, 
there is a species having a similar external pustulose character, but the 
interspaces are porous; so also is an apparently similar species found in 
the Upper Chalk, 
