110 



FOSSIL ECHINI OF THE WEST INDIES. 



and lower Oligocene species. At the time the manuscript for their 

 monograph was prepared, the Ocala limestone was supposed to be of 

 Oligocene age. Later C. W. Cooke showed that its horizon is upper 

 Eocene. 1 Doctor Cooke has for several years been studying the 

 stratigraphy and the faunas of the upper Eocene and lower Oligocene 

 formations of the southern and southeastern United States, and intends 

 in a future paper to present a complete account of the stratigraphic 

 distribution of the echinoids found in these deposits. He has already 

 published some information on this subject in the paper cited below. 2 

 Notwithstanding Kew's careful descriptions and good figures of the 

 Tertiary echinoids from northeastern Mexico, knowledge of them is 

 deficient, mostly because of the inadequacy of the data on their 

 stratigraphic relations. Recently I have had an opportunity to review 

 in the field the stratigraphy of the Tertiary formations in eastern 

 Mexico and large collections of echinoids have come into my hands. 

 Therefore it is hoped that before a great while an adequate account 

 of the echinoids from this region, accompanied by proper stratigraphic 

 data, may be made available to stratigraphers and palaeontologists. 



CRETACEOUS SPECIES. 



List of species of West Indian Cretaceous Echinoids. 



All of the species above listed, except Hemiaster berkeyi, described as 

 new by Doctor Jackson, are known only from Cuba. With reference 

 to the Cuban specimens, it is regrettable that the precise stratigraphic 

 relations under which they occur are not known. Some specimens from 

 Santa Lucia are referred by Cotteau and Egozcue to the Cretaceous 

 and others from the same locality are referred to the Eocene. Speci- 

 mens from Cienfuegos are referred to the Cretaceous, Eocene, and 

 Miocene. Additional collections made according to the stratigraphic 

 position of the specimens are not available, but it seems probable that 

 the eight species here considered are of Cretaceous age. 



1 Cooke, C. W., Age of the Ocala limestone: U. S. Geol. Sur. Prof. Paper 95, pp. 107-117, 1915. 



* Cooke, C W., The stratigraphic position and faunal associates of the orbitoid Foraminifera 

 of the genus Orthophragmina from Georgia and Florida: U. S. Geol. Sur. Prof. Paper 108, 

 pp. 109-113, 1917. 



