50 FOSSIL ECHINI OF THE WEST INDIES. 



Oligocene ; the smaller specimens are from the Collazo shales, Collazo 

 River, 5 km. east of San Sebastian, Porto Rico, collected by Mr. 

 Rabell; holotype and paratype, 2 specimens, station 116, Amer. Mus. 

 Nat. Hist. No. 18570. The larger four-rayed specimen is from shaly 

 limestone, Rabell's Ranch, 11 km. northeast of San Sebastian, Porto 

 Rico, collected by C. A. Reeds, station 115, Amer. Mus. Nat. Hist. 

 No. 18571. All are from the Expedition of the New York Academy of 

 Sciences, the Porto Rican Government and the American Museum of 

 Natural History cooperating. 



Genus ENCOPE Agassiz, 1841. 



Type species. — Echinodiscus emarginatus Leske, 1778, Add. ad 

 Klein, p. 136. 



As the genera Encope and Mellita are represented in the living fauna 

 on both the east and west coasts of tropical America, and the genus 

 Encope is known from several species occurring fossil in the Panama 

 Canal Zone, it is perhaps singular that so little is known of these genera 

 as occurring fossil in the West Indies. 



I described 3 species of Encope from the Miocene, Gatun formation, 

 of the Panama Canal Zone as new, namely, E. annectans, platytata, 

 and megatrema (1917, Proc. U. S. Nat. Mus., vol. 53, pp. 489 to 501, 

 plates 62 to 68). When that paper was published, by oversight an 

 article by Franz Toula was overlooked (Die jung-tertiare Fauna von 

 Gatun am Panama Kanal, Jahrb. Geol. Reichsant., Wien, vol. 61, 

 pp. 487 to 530, plates 30 and 31, 1911). In his paper Toula described as 

 new Encope gatunensis. The species I described as platytata is near to 

 but probably distinct from gatunensis. The similarities are in the 

 flatness of the test and the narrowness and long posterior extension of 

 the ambulacral petals I and V. The differences are that the lunule in 

 interambulacrum 5 is short and rounded in platytata, whereas it is 

 long and slit-like in gatunensis. Both species are represented only by 

 fragmentary specimens, platytata being wanting in the posterior 

 portion of the test and gatunensis wanting in the anterior portion. 

 Unless further material should prove the identity of these species, it 

 seems they had best be considered close but distinct. 



Key to the West Indian Fossil Species of Encope. 



Test large, longer than wide e. cia 



Test small, wider than long £ latus 



Encope ciae de Cortazar. 



Encope dm de Cortazar, 1880, Bol. Com. Mapa Geol. Espafia, vol. 7, p. 227, plate G, figs, 

 la to 3a; plate H, figs, la, 2a. Cotteau, 1881, Ann. Soc. Geol. Belgique, vol. 9, p. 17; 

 1897, Bol. Com. Mapa Geol. Espafia, vol. 22, p. 44, plate 13, figs, la to 3a; plate 14^ 

 figs, la, 2a. 



This fine large species, known only from a single specimen, is referred 

 by Cotteau to the upper "Miocene" of Calabazar, in the environs of 



