736 SYSTEMATIC PALEONTOLOGY 



The young are much broader relatively than the adults. Xone of the 

 Maryland individuals that have come under observation exhibit the strong 

 radial plication which characterizes the variety fragilis. There is scarcely 

 an individual which is less feebly plicate than Morton's type of T. harlnni. 

 sensu stricto. 



The species occurs associated with the Eocene, and quite a little litera- 

 ture has grown up around the question of whether or not the species is 

 reworked. 



Occurrence. RANCOCAS FORMATION. Drawyer Creek, near Odessa, 

 south side of Appoquinimink Creek between Odessa and mill-dam, 

 Noxonville, Noxontown Millpond, Delaware: head of Sassafras River 

 on Jackson farm and Jacobs farm, Maryland. 



Collections. Maryland Geological Survey, Philadelphia Academy of 

 Natural Sciences. 



CLASS BRYOZOA 



order CYCLOSTOMATA ' 



Family DIASTOPORIDAE 



Genus STOMATOPORA 1 Bronn 



STOMATOPOKA REGULARIS Gabb and Horn 

 Plate XLVI, Fig. 11 



Stomatopora regularis Gabb and Horn, 1862, Jour. Acad. Nat. Sci., Phila., 

 (2) vol. v, p. 172, pi. xxi, fig. 63. 



Stomatopora regularis Weller, 1907, Geol. Survey of New Jersey, Pal., vol. 

 iv, p. 313, pi. xx, figs. 1-3. 



Alecto regularis Meek, 1864, Check List Inv. Fossils, N. A., Cret. and Juras- 

 sic, p. 4. 



Description. " Zoarium encrusting, ramose, the branches filiform and 

 usually very regular, from 0.4 mm. to 0.6 mm. in width, the surface 

 slightly convex, the sides sloping gently towards the lateral margins, 

 rarely or never abrupt. Zocecia regular in shape, usually a little wider 

 just behind the aperture and the sides converging slightly posteriorly, 

 this difference in width, however, is frequently scarcely noticeable and is 

 never sufficient to sharply separate the successive zocecia from each other. 



