44 On a new Genus of Carboniferous Polyzoa. 
the orifice is placed having a prominent margin, projecting a 
little from the surface of the stem at its dorsal side, whilst the 
true orifice itself projects at its lower margin. At the point 
at which the cells bend from the perpendicular to the oblique 
angle at which they pass to the surface, one of the walls is 
much constricted, that nearest the external surface. 
Ihave never seen this pretty coralline in any other condition 
than such fragments as are here figured; but a specimen has 
lately come under my notice in which there appears to be the 
remains of a lateral branch or dissepiment, after the manner 
of Polypora or Fenestella; but on this point I am in doubt. 
Under these circumstances it would be premature to state 
whether the habit was simply dendroid, with free stems and 
branches, or reticulate. 
I submitted specimens of the simple bifureating stems to 
Mr. Busk, who very kindly informed me that in such a con- 
dition they resembled the genus Vincularia, Defrance, but that 
none of its hitherto described species were so pitted or reticu- 
lated, and that, as the openings of the cells do not appear to 
be placed on all sides of the stems, as they are invariably 
in Vincularia, it is probably the type of a new genus, perhaps 
allied to the latter. 
As I am unable to meet with any generic diagnosis which 
would include the form, I have adopted, provisionally at least, 
the foregoing name for its reception, and for a specific desig- 
nation would associate with it the name of Mr. Busk, to whose 
kindness I am indebted for much information on fossil Polyzoa. 
In addition to this species, there are one or two others in my 
possession which will perhaps come under this genus. 
Hyphasmopora Buskii, sp. nov. 
Cell-depressions pyriform, subalternating with one another, 
narrowing towards their ventral margins, expanding above, 
where they project a little from the surface of the polyzoarium, 
arranged in about six linear series, the individual depressions 
of each row separated from one another vertically by the in- 
terstitial reticulation ; laterally the margins of contiguous rows 
sometimes unite, forming dividing ridges or keels; cell-orifice 
round, placed within the cell-depression at its upper extremity. 
The interstitial network encloses a series of irregular poral 
openings. The sides are occupied by the two lateral rows of 
cell-depressions. The reverse, over which the reticulation at- 
tains its greatest development, sometimes has a single row of 
large cell-depressions placed along the median line, at various 
distances from one another. 
