476 BULLETIN 103, UNITED STATES NATIONAL MUSEUM. 



Localities and geologic occurrence. — Island of Antigua, in the Antigua 

 formation, at stations 6854, Rifle Butts; 6856, Friar's hill; 6881, 

 Willoughby Bay; 6888, one-half mile north of McKinnon's Mill, 

 collected by T. W. Vaughan. Previously collected by Robert T. Hill 

 and by J. W. Spencer, in addition to the material originally studied 

 by Duncan. 



Island of Porto Rico, Lares road, associated with corals, represent- 

 ing the Pepino formation of Hill, collected by Bela Hubbard of the 

 New York Academy Scientific Survey of Porto Rico. 



Cuba, station 3481, Rio Canapu, Manassas trail, collected by 

 Arthur C. Spencer. Station 7506 west side of Ocujal Spring, near 

 Guantanamo, Cuba, altitude between 200 and 250 feet, at contact 

 with underlying conglomerate, collected by O. E. Meinzer. Frag- 

 ments from station 7522, Mogote Peak, one-half mile east of east 

 boundary of United States Naval Reservation, Guantanamo, eleva- 

 tion about 375 feet, a. t., collected by O. E. Meinzer, probably should 

 be referred to variety magnifica (Duncan). 



Georgia station 3381, 4 miles below Bainbridge, Flint River, in 

 the base of the Chattahoochee formation, collected by T. W. Vaughan. 



Panama, station 6587, Tonosi River, collected by D. F. Mac- 

 Donald. A poorly preserved specimen from this locality seems 

 referable to this species. 



This is stratigraphically one of the most important coral species of 

 the American Oligocene, for it seems to occupy almost the identical 

 horizon everywhere it has as yet been found. Its stratigraphic 

 position, as at present known, is middle Oligocene; but the possibility 

 of some specimens being upper Eocene needs to be borne in mind (see 

 page 206). 



DIPLOASTREA CRASSOLAMEJLJ.ATA var. MAGNIFICA (Duncan) Vaughan. 



Plate 138, figs. 1, 2, 2a. 



1863. Astraea crassolamellata var. magnifica Duncan, Geol. Soc. London, Quart. 

 Journ., vol. 19, p. 417, pi. 13, fig. 3. 



The following is Duncan's original description: '.' In the smaller 

 corallites of this variety the spear-shaped septa are seen; but in the 

 larger, where there are from twelve to fourteen septa in a system, the 

 primary, secondary, and tertiary orders are nearly equal in size. 

 They have lost the extreme relative thickness between their extremi- 

 ties, and, although still very thin at the columella, they are not greatly 

 developed at the wall. In some corallites the septa, in transverse 

 view, are not straight, but form curving radii; and in all, the relation 

 which the septa bear to the interseptal spaces and to the wall is very 

 much exaggerated. 



' ' Corallites circular in transverse section; they vary much in diame- 

 ter, and are now and then crowded , but generally have much coenen- 



