NO. 4 ECHINOIDS, TRINIDAD AND VENEZUELA — COOKE 3 



it was found in Trinidad. Its affinities appear to be with Cretaceous 

 rather than Eocene species. This is in accordance with the Paleocene 

 fauna of the United States, which inchides more genera reminiscent 

 of the Cretaceous than of the Eocene (Cooke, 1959, p. 2). 



SPECIES OF MIDDLE EOCENE AGE 



One species, Fibularia farallonensis Cooke, n. sp., was collected by 

 J. A. Bullbrook on Farallon Rock, near San Fernando, Trinidad. 

 According to W. P. Woodring (oral communication), H. G. Kugler 

 regards this rock as representing a reef facies of the Navet formation 

 of middle Eocene age. This correlation seems to be supported by the 

 echinoid, which is similar to Fibularia texana (Twitchell) from the 

 middle Eocene Weches greensand member of the Mount Selman 

 formation of Texas. 



SPECIES OF LATE EOCENE AGE 



Seven species of echinoids from Trinidad or Venezuela are referred 

 to the late Eocene. None are new. Their names are as follows : 



Oligopygus wetherbyi kuglcri Jeannet (from Trinidad) 

 Oligopygus haldemani coshiliformis Jeannet (from Trinidad) 

 Oligopygus rotundus Cooke (from Trinidad and Venezuela) 

 Oligopygus nancei Cooke (from Venezuela) 

 Haimea ovum-serpentis (Guppy) (from Trinidad) 

 Weisbordclla mirabilis (Jackson) (from Trinidad) 

 Eupafagus clevei (Cotteau) (from Venezuela) 



Of these seven species, typical Oligopygus zvethej-byi de Loriol and 

 typical Oligopygus haldemani (Conrad) are restricted to the Ocala 

 limestone (Crystal River limestone of Puri), the youngest formation 

 of late Eocene age in Florida. Both subspecies are known only from 

 the San Fernando formation of Trinidad. Oligopygus rotundus, 

 described originally from the Moodys Branch (?) formation of Ala- 

 bama, occurs also in the San Fernando formation and in the Tinajitas 

 formation of Venezuela. Oligopygus nancei is known only from the 

 Tinajitas formation of Venezuela. Haimea ovum-serpentis, typically 

 from the San Fernando formation, occurs also in the St. Bartholomew 

 limestone of the British West Indies. Weisbordella mirabilis has been 

 found only in the San Fernando formation, but it is closely related 

 to, possibly only a variant of, Weisbordella johnsoni (Twitchell), a 

 species abundant in the Ocala limestone. Eupatagus clevei, typically 

 from the St. Bartholomew limestone, occurs also in the Inglis lime- 

 stone of Florida (Cooke, 1959, P- 89) and in the Gatuncilla formation 

 of Panama (Cooke, 1948; Woodring, 1957, p. 22). The formations 



