398 BULLETIN 103, UNITED STATES NATIONAL MUSEUM. 



are not prolongations of the distal ends of the septa. They are only 

 elevations on the exothecal surface corresponding in position with. 

 the septa. The exotheca is usually built up of more or less horizontal 

 platforms, which when closely applied one above another give rise 

 to a compact, or even a solid exotheca; if the platforms are separated, 

 the intervening spaces contain vesicular dissepiments. In some 

 instances the exothecal surface is formed by thin-walled vesicles. 

 The septal trabeculae are directed upward at a low angle, and have 

 their courses indicated by rather small and crowded granulations. 

 The inner septal edges or trabeculae from the septal edges fuse to 

 form a false columella. The septa usually are imperforate ; however, 

 in some instances perforations occur between the trabeculae near 

 the columella, but never so abundantly as in Orbicella annularis. 



Localities and geologic occurrence. — Recent specimens in the United 

 States National Museum: Osprey and Caesars Creek, Florida, col- 

 lected by T. Wayland Vaughan; southern Florida, collected by S. T. 

 Walker; Caesars Creek, Florida, collected by Edw. Palmer; Cedar 

 Keys, Florida, collected by Lieut. J. F. Moser, U. S. N.; reefs near 

 Miami, Florida, collected by J. E. Benedict. 



Pleistocene, Miami oolite and Key Largo limestone, Florida, col- 

 lected by T. W. Vaughan. 



In the Pliocene Caloosahatchee marl on Shell Creek and Caloosa- 

 hatchee River, Florida, collected by numerous persons. 



In the Miocene La Cruz marl at stations 3440 and 3443, in the 

 northeast part of Santiago, Cuba; station 3445, crossing over the 

 railroad of the highway from Santiago to the Morro, collected by 

 T. W. Vaughan. At one time I thought these Santiago specimens 

 might come from a deposit of Pliocene age, but the other associated 

 fossils indicate that this is another species of considerable geologic 

 antiquity. A specimen from station 3451, Cienaga railroad station, 

 near Habana, collected by T. W. Vaughan, seems to belong to this 

 species. 



SOLENASTREA BOURNONI Milne Edwards and Haime. 



1850. Solenastrea bournoni Milne Edwards and Haime, Ann. Sci. nat., ser. 3, 



Zool., vol. 12, p. 121. 

 1861. Cyphastrea oblita Duchassaing and Michelotti, M£m. Corall. Antilles, 



p. 77 (of reprint). 

 1861. Plesiastrea carpinetti Duchassaing and Michelotti, Mem. Corall. Antilles, 



p. 77 (of reprint). 

 1861. Solenastrea ellisii Duchassaing and Michelotti, Mem. Corall. Antilles, 



p. 77 (of reprint). 

 1861.' Solenastrea micans Duchassaing and Micheloltti, Mem. Corall. Antilles, 



p. 77 (of reprint), pi. 9, figs. 10. 11. 

 1861. Leptastrea caribaea Duchassaing amd Michellotti, Mem. Corall. Antilles, 



p. 78 (of reprint). 

 1863. Plesiastraea distans Duncan, Geol. Soc. London Quart. Journ., vol. 20, p. 



37, pi. 4, figs. 4a, 4b. 



