348 BULLETIN 103, UNITED STATES NATIONAL MUSEUM. 



The septa are subequal at the wall, and 16 in number; but only 

 eight reach the small and deep styloid columella; the others project 

 very slightly, and are moniliform on their free edge. The pali are 

 attached to the eight larger septa. 



"Height of corallum, one-tenth inch [ = 2.5 mm.]. Breadth of 

 calice, one-twentieth inch [ = 1.25 mm.]." 



The following notes are based on the type-specimen : 



It is a small thin fragment, 17.5 mm. long, 8 mm. wide, and 4 mm. 

 thick. 



The calices are moderately deep polygonal, many are elongate, the 

 smaller ones measure 0.9 mm. in diameter, an elongated one is 1.2 

 mm. wide and 2 mm. long. The walls are thin, about 0.2 mm. wide; 

 however, the upper edges of the septa are flattened and somewhat 

 expanded. No mural styles. 



Septa, 16 in number, equal in thickness at the wall, thicker than 

 the spaces between; 8 extend to the columella, the laminae thinner 

 between the portions surrounding the columella and the outer ends. 

 The other 8 septa are short. The margins are finely dentate. Dis- 

 tinct pali absent. Apparently dissepiments are present. 



ColumeUa styliform, rather prominent, compressed. 



This coral can not be referred to StepTianocoenia because there are 

 no pali and the septal margins are dentate, instead of being entire. 

 However, it exhibits all the characteristics of Astrocoenia. In the 

 size of the calices, number of the septa, and character, of the septal 

 margins it resembles A. duerdeni (Vaughan), but differs from that 

 species by the apparent absence of mural spines Notwithstandmg 

 this, it is not impossible that the type-specimen could be a portion 

 of a corallum of A. duerdeni, the styles being absent from the area 

 whence it was derived. 



Locality and geologic occurrence. — Island of St. Bartholomew, 

 P. T. Cleve, collector; subsequently collected by T. W. Vaughan; in 

 the upper Eocene St. Bartholomew limestone. 



Type. — University of Upsala. 



ASTROCOENIA DECATURENSIS, new species. 



Plate 78, figs. 3, 3a, 4, 4a. 



1863. Astrocoenia ornata Duncan, Geol. Soc. London Quart. Journ., vol. 19, 



p. 425, pi. 14, fig. 7. (Not Milne Edwards and Haime.) 



1864. Astrocoenia ornata Duncan, Geol. Soc. London Quart. Journ., vol. 24, p. 23. 



Corallum massive, rather large, upper surface with numerous gib- 

 bosities. One specimen has a base 14 by 17 cm., respectively, as the 

 smaller and greater diameter, and is about 8 cm. in height, another 

 has 19 cm. as the greatest diameter of the base. 



Corallites polygonal, separated by walls that are never very thick, 

 rarety as much as 1 mm., upper edge usually if not always marked 



I 



