MARYLAND GEOLOGICAL SURVEY 207 



Family FASCIPORIDAE. 



Genus FASCIPORA d'Oibigny. 

 FaSCII'ORA SUBRAMOSA 11. sp. 



IMiilc LIX, Figs. 1, 2. 



Description. — Zonriiiiii ((iiisistiiiii' of small llaltciKjd Iji-aiiches, varying 

 from subi'vlindrical lo llaliclhilc, ii.-iially about l.o mm. in thickness. 

 Ends of IjrancJiC'S convex, occupied by tlie months of numerous sub- 

 equal, thin-walled, angular tubes, usually about 0.12 mm. in diameter. 

 Sides of branches with rather obscure transverse wrinkles and the aper- 

 tures of the true or fully-developed zooecia. The latter are somewhat 

 scattered, though a tendency to arrangement in series— chiefly longitu- 

 dinal — is commonly apparent. The rounded contour of the zooecial 

 tube-wall is but dimly discernible behind the moderately raised aper- 

 tural rims. Zooecial apertures ovate, about 0.1-i mm. by 0.18 mm., 

 with about five in 2 mm. Interapertural space as well as apertural 

 covers, minutely punctate. In vertical fractures the tubes are shown 

 to be very long and that they approach the surface very gradually. 

 Ooecium a mere inflation of the surface through which one or more of 

 the zooecial tubes pass. 



In the general form of its zoarium this species agrees very well with 

 F. pavonina (Michelin) d'Orbigny's type of the genus, but its zooecia 

 are much smaller and not nearly so prominent. 



Occurrence. — Aquia Foematiox. Upper Marlboro. 



Collection. — Maryland Geological Siu'vey. 



Family IDMONIIDAE. 



Genus RETICULIPORA d'Orbigny. 



Eeticulipoea dichotoma Gabb and Horn. 



Plate LIX, Figs. 9-12. 



Beticulipora dicJioioma Gabb and Horn, 1862, Jour. Acad. Nat. Sci. Phila., 2ud ser., 



voL V, p. 173, pL xxi, tig. 64. 

 Comp. Bicrixina gandryana Pergens, 1890, Eeris. des Brvozoaires du Cretace, Bull. 



Soc. Beige de GeoL, t. ill, pi. xiii, fig. 2. 



Description. — Fragments only of this species have been seen. So far 

 as these admit of judging, the zoarium is not reticulated but consists of 



