486 BULLETIN 103, UNITED STATES NATIONAL MUSEUM. 



Genus ACTINACIS d'Orbigny. 



1849. Actinacis d'Orbigny, Notes sur des Polyp, foss., p. 11. 

 1860. ^cfmacis Milne Edwards, Hist. nat. CoralL, vol. 3, p. 170. 



Type-species. — Actinacis martiniana d'Orbigny. 



I have not been able to study the type-species of this genus, but 

 judging from Reuss's figures oi A. martiniana ^ it is probable that the 

 corals here referred to are correctly determined. 



Besides the species described here, there is another species of 

 Actinacis in the West Indies Tertiary formations, namely, the coral 

 from the Eocene St. Bartholomew limestone, to which Duncan applied 

 the name Astreopora panicea? It will be considered in another 

 paper. 



The species to which Duncan applied the names Heliastraea 

 exsculpta ^ (not Astraea exsculpta Reuss ^) and Heliastraea cyathi- 

 formis,^ and which I made under the latter name, the type species of 

 Multicolumnastraea,^ deserves mention here. The intercoraUite costae 

 in Duncan's Heliastraea cyathiformis are more or less vermiculate 

 and are joined one to another by synapticulae, between which there 

 are openings. This species is very close to Actinacis, but the coarse 

 columellar tubercles or pillars may warrant generic separation. 

 The species,, according to the stratigraphic data supplied by Mr. R. T. 

 Hill, occurs in his Blue Mountain Series, of Cretaceous age, and his 

 Catadupa beds, of Eocene age.^ It seems to me that the Catadupa 

 beds are probably of Cretaceous age, for they contain no species of 

 corals in common with the Richmond and Cambridge formations, 

 while two of the five species recorded from them are common to the 

 Blue Mountain Cretaceous. 



ACTINACIS ALABAMIENSIS (Vaughan). 



Plate 149, figs. 3, 3a. 



1900. Turbinaria (?) alabamiensis Vaughan, U. S. Geol. Survey Mon. 39, p. 194, 

 pi. 23, figs. 1, 2, 3; pi. 24. 



The type-specimen (Cat. No. 158482) and the paratypes (Cat, 

 Nos. 158480 and 158481, U.S.N.M.) clearly belong to the genus 

 Actinacis, to which I suggested they might belong in the original 

 account of the species. The following is the original description: 



"Corallum massive, the masses may be more than 20 cm. across 

 and 7 cm. thick, upper surface apparently convex or concave. Gen- 



1 Beitrage zur Charakteristik der Kreideschichten in den ostalpen, K. K. Akad. Wiss. Wien. Math.- 

 Naturw.-Cl., vol. 7, pi. 24, figs. 12-16, 1851. 



2 Geol. Soc. London Quart. Journ., vol. 29, p. 561, 1873. 

 » Idem, vol. 21, pp. 7, 8, 11, 1865. 



4 K. K. Akad. Wissensch. Wien. Math.-Naturw. CI., Denkshr. vol. 7, p. 114. 



5 Geol. Soc. London Quart. Journ., vol. 21, pp. 7, 8, pi. 1, figs, la, 16, 1865. 



6 Mus. Comp. Zool. Bull., vol. 34, pp. 235-237, pi. 37, figs. 5, 6, 7; pi. 38, fig. 1, 1899. 

 1 Vaughan, T. W., Mus. Comp. Zool., vol. 34, p. 231, 1899. 



