NO. 4 ECHINOIDS, TRINIDAD AND VENEZUELA — COOKE 5 



SPECIES OF MIOCENE AGE 



The species indicated as probably occurring in beds of Miocene age, 

 though some persist to the Recent, are as follows : 



Encope secoensis Cooke, n. sp. 



Encope michelini Agassiz 



Encope kugleri Jeannet 



Encope (Mclitclla) falconcnsis Cooke, n. sp. 



Clypcaster rosaccus (Linnaeus) 



Echinolampas lycopersiciis Guppy 



Cassidulus falconcnsis (Jeannet) 



Brissopsis antillaruni Cotteau 



Antillaster lamberti Jeannet 



Pericosmns stchlini Jeannet 



Brissus unicolor (Leske) 



Plagiobrissus grandis (Gmelin) ? 



Rhynobrissxis rostratus Cooke, n. sp. 



Lovenia of. L. dnmblci Kew 



At least two horizons of Miocene age are represented in this list. 

 The older is that of the Anguilla limestone of the British West Indies, 

 which seems to be coeval with the Chipola formation of Florida. Its 

 occurrence in Trinidad and Venezuela is indicated by Echinolampas 

 lycopersiciis, described originally from Anguilla and believed to be 

 restricted to that horizon. Another species described from Anguilla 

 is Brissopsis antillarmn. This, however, is less dependable, for it may 

 have a longer range. Several species from the "couches d'Ojo de 

 Agua" were referred to the middle Miocene by Jeannet (1928). The 

 name Ojo de Agua, according to the "Lexico" (Schwarck Anglade, 

 1956, p. 460), has been used for two formations, one of middle Mio- 

 cene age, the other predominantly upper Miocene. 



The younger horizon includes the Springvale formation of Trini- 

 dad and the Chiguaje and La Vela formations of Venezuela, which 

 are classified as late Miocene and presumably are about the age of 

 the Duplin marl of the Carolinas and Florida. Among the species 

 from these late Miocene formations may be mentioned Encope 

 falconensis and Rhynobrissus rostratus, but both of these species may 

 have a longer range. 



SPECIES OF PLIOCENE AGE 



The species attributed to the San Gregorio formation include 

 Lytechinus variegattis (Leske), Encope secoensis Cooke, n. sp., En- 

 cope (Melitella) falconensis Cooke, n. sp., Moira atropos (Lamarck), 

 and Agassisia scrohiculata Valenciennes. The Lytechinus and the 

 Moira are still living in Atlantic waters, but Agassisia scrohiculata 



