1887.] NATURAL SCIENCES OF PHILADELPHIA. . 11 



DESCRIPTION OF A NEW FORM OF BRYOZOA. 

 BY DR. C. ROMINGER. 



Patellipora stellata. Pi. I, fig. lo. 



Saucer-shaped colonies attached to foreign bodies by a short, 

 stout root-like stem. Under surface of colony covered by a 

 dense, smooth epithecal crust. From the centre of the concave, 

 terminal, discoid expansion diverge from 8 to 10 rounded, stout 

 radial crests or bars, which, towards the margin of the disk, 

 dilate wedge-like. Intervening between these radii are deep 

 furrows, likewise dilating toward the margin. The outer half of 

 each of these wedge-like bars is again divided into two branches 

 by a furrow entering them from the margin and running into a 

 point about half way from the centre. The surface of these 

 forked radial bars is covered with from 3 to 4 longitudinal 

 rows of small, round orifices, which make them resemble the 

 poriferous side of a fenestelloid stem. These orifices dilate in 

 the interior into flask-like cell-bags, which can be observed closely 

 packed together, on the underside of the bars, if by accidental 

 wearing the epithecal coating of the underside has been removed. 



This peculiar Bryozoa was discovered by me in some drift- 

 boulders at Ann Arbor, associated with characteristic corniferous 

 limestone fossils, in silicified condition. Only three of them 

 were found by me ;. the most perfect and largest one of them is- 

 represented in the figure. 



