34 FOSSIL ECHINI OF THE WEST INDIES. 



Miocene (?), from a solid buff limestone along south coast of Porto 

 Rico, about 5 miles west of Ponce, in what is called Culebrinas Point ; 

 this limestone is exposed in a bluff over 50 feet high ; 3 fine specimens. 

 Station 37/5, Graham John Mitchell collector, 1917. Mr. Mitchell 

 had charge of the Ponce District in the Survey work of 1917. Ponce 

 Chalk, Government Road, Ponce to Penuelas, km. 1, collected from 

 embankment 200 feet long on north side of the road, Porto Rico, 1 fine 

 specimen, station 285. Ponce limestone, cliff bank, north side of Ponce 

 to Penuelas Road, km. 2, about 5 km. west of Ponce, Porto Rico, 1 

 specimen, station 299. Same data, 2 specimens, station 301. Material 

 from the Porto Rico stations 285, 299, and 301 collected by C. A. Reeds, 

 on Expedition of the New York Academy of Sciences, the Porto Rican 

 Government and the American Museum of Natural History coop- 

 erating. 



The locality given by Cotteau is calcareous concretions, Bellamar, in 

 the Province of Matanzas, Cuba. He does not give any geological 

 horizon, but says the specimen he figured is in the collection of the 

 Comisi6n del Mapa Geol6gico de Espafia. Lambert reports this 

 species from Anguilla and says the matrix is a calcareous tuff very 

 different from that of the Miocene species and evidently is Pliocene; 

 J. W. Gregory collector, 1899, specimen in the British Museum. 



Clypeaster concavus Cotteau. 

 (Plate 2, Figures 10 to 12.) 



Clypeaster ellipticus Guppy (non Michelin), 1866, Quart. Jour. Geol. Soc. London, vol. 22, 



p. 299. 

 Clypeaster concavus Cotteau, 1875, Kongl. Sven. Vet. Akad. Handl., vol. 13, No. 6, p. 16, 



plate 2, figs. 4 to 8. Guppy, 1882, Scientific Assoc. Trinidad, Proc., part 12, p. 195. 



Cotteau, 1897, Bol. Com. Mapa Geol. Espafia, vol. 22, p. 36, plate 7, figs. 4 to 8. 



Lambert, 1915, Mem. Soc. d'Agric. de 1'Aube (Troyes), vol. 79, p. 18. 

 Echinanthus concavus Gregory, 1895, Quart. Jour. Geol. Soc. London, vol. 51, p. 295. 

 Diplothecanthus concavus Brown, 1914, Proc. Acad. Nat. Sci. Philadelphia, vol. 65, p. 600. 



The following is an extract from the original description of this species : 

 Species of medium size, narrowed and rounded anteriorly, wider and 

 subtruncate posteriorly, upper face more or less swollen, sometimes sub- 

 convex, always thinning posteriorly, ventral side strongly depressed. 

 Apical disk nearly central. Ambulacral areas wide, swollen, strongly 

 petaloid. Petals nearly closed at the tips, unequal, the anterior petal III 

 being longer and narrower than the other four. Poriferous areas very 

 much developed, having their greatest width toward the tips of the petals, 

 formed of pores distinctly unequal, united by a groove. In the part where 

 the poriferous areas are the widest, the ridges of the test which separate 

 the grooves contain each a series of 10 or 12 small tubercles. Peristome 

 narrow, subpentagonal, opening in the excavation of the lower side. Peri- 

 proct small, rounded, near the posterior border of the test, from which 

 it is separated by a narrow band of test. Apical disk stelliform, with 5 

 genital pores. 



A large specimen in the U. S. National Museum, Cleve collection 

 (No. 115375), measures 21.5 mm. in height, 73 mm. in length, and 58.5 



