44 On a new Gtnu^ of Carboniferous Polyzoa. 



the orifice is ])lacccl luiviiii; a prominent niarp^in, projecting a 

 little from the surface of the stem at its dorsal side, whilst the 

 true orifice itself projects at its lower mari^in. At the point 

 at which the cells bend from the perpendicular to the oblifjue 

 angle at which they pass to the surtaee, one of the walls is 

 much constricted, that nearest the external surface. 



1 have never seen this ])retty coralline in any other condition 

 than such fragments as are here figured ; but a specimen has 

 lately come under my notice in wiiich there ap})ears to be the 

 remains of a lateral branch or dissepiment, after the manijer 

 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 tlie simple bifurcating stems to 

 ^Ir. Busk, who very kindly informed me that in such a con- 

 dition they resembled the genus Vincnlaria, 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 ])laced on all sides of the stems, as they are invariably 

 in Vincidaria, 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 Bitskit, sp. nov. 



Cell-depressions pyriform, subalternating with one another, 

 narrowing towards their venti-al margins, expanding above, 

 where they project a little from the surface of the polyzoarium, 

 aiTanged 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. 



