MARYLAND GEOLOGICAL SURVEY 445 



Astrangia ? bella {para) Milne-Edwards and Haime, 1857, Hist. Nat. Corall., vol. ii, 



p. 615. 

 Septastrcea forbexi de Fromentel, 1861, Introduction Etude Polyp. Foss., p. 175. 

 Astrangia ? bella {pars) de Fromentel, 1861, Introduction Etude Polyp. Foss., p. 237. 

 Astrea [?] Marylundica Meek, 1864, Miocene Check List, Smith. Misc. Coll. (183), p. 1. 

 Septastrea (?) sexradiata Meek, 1864, Miocene Check List, Smith. Misc. Coll. (183), 



p. 1. 

 Septastrea forbesi Meek, 1864, Miocene Check List, Smith. Misc. CoU. (183), p. 1. 

 Astrangia [Cijenungia) uiarijlandica Verrill, 1870, Trans. Conn. Acad. Sci., vol. i, 



pt. 2, p. 530. 

 Astrea sp. W. B. and H. D. Rogers, 1884, Reprint Geology of the Virginias, p. (507. 

 Glyphastrwa forbesi Duncan, 1886, Abstract Proc. Geol. Soc. London, No. 495, p. 18. 

 Ohjphastrcea forbesi Duncan, 1887, Quart. Jour. Geol. Soc. London, vol. xliii, p. 29, 



pi. iii. 

 Glyphastrmi sexradiata Duncan, 1887, Quart. Jour. Geol. Soc. London, vol. xliii, 



p. 30. 

 Septastrwa forbesi Hinde, 1888, Quart. Jour. Geol. Soc. Loudon, vol. xliv, p. 218, 



pi. ix, flgs. 1-5, 7-15, 17. 

 Septastrcea sexradiata Hinde, 1888, Quart. Jour. Geol. Soc. London, vol. xliv, p. 219, 



pi. ix, flgs. 6, 16. 

 Cvenangia marglandica Gane, 189.5, Johns Hoi)kins Univ. Circ, vol. xv. No. 121, 



p. 10. 

 Septastrcea sexradiata Gane, 1895, Johns Hopkins Univ. Circ, vol. xv. No. 121, p. 10. 

 Ceenangia marylandica Gane, 1900, Proc. U. S. Nat. Museum, vol. xxii, p. 190. 

 Septastrcea sexradiata Gane, 1900, Proc. U. S. Nat. Museum, vol. xxii, p. 194. 

 Septastrea sexradiata Vaughan, 1901, U. S. Fish Commission, Bulletin for 1900, 



vol. ii, p. 299. 



Description. — Corallum possesses an encrusting base from which rise 

 more or less compressed stems with short rounded branches, or large flat- 

 tened masses with lobate and digitiform expansions. 



Corallites, externally hexagonal or pentagonal in cross-section, the 

 walls of adjacent individuals are closely applied but are separate; inter- 

 nally, more or less cylindrical. The diameter varies from about 3 to 8.5 

 mm., with an average width of 5 or 6 mm. In immature specimens the 

 walls are thin, but they become secondarily very much thickened by basal 

 calcareous deposit. In the mature coralla the walls are thick, occa- 

 sionally as much as 2 mm. The line of fusion between adjoining coral - 

 lites is indicated by a distinct shallow furrow. Minute granules, densely 

 crowded, occur over the surface of the wall, between and over the septa 

 and on the columella. Internally below the calices the corallites are 

 often completely filled by basal deposit. 



Septa, in normal adult calices twelve large subequal septa that extend 



