40 FOSSIL ECHINI OF THE WEST INDIES. 



feet specimen from the "Miocene" of Antigua, collected by J. W. 

 Gregory in 1899, collection of British Museum. Cotteau ascribes the 

 species to the "Miocene" and gives the locality as San Martin, Province 

 of Matanzas, Cuba. 



Clypeaster planipetalus Cotteau. 



(Plate 6, Figures 1, 2.) 



Clypeaster planipetalus Cotteau, 1897, Bol. Com. Mapa Geol. Espafla, vol. 22, p. 38, plate 8, 

 figs. 1 to 4. 



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

 Test medium-sized, elliptically subpentagonal, truncate posteriorly, 

 elongate anteriorly. Upper side moderately elevated, lower side moder- 

 ately concave. Ambulacral areas petaloid, open at the distal ends. Porif- 

 erous areas with round pores united by shallow furrows. At the distal 

 ends of each poriferous area the internal pores are almost united with the 

 external, coming together in an irregular manner. On each of the ridges 

 which separate the ambulacral furrows is a band of tubercles, 4 or 5 in 

 number, on the outer broad part of each area. Tubercles small, abundant, 

 somewhat larger on the lower side, showing between them fine granulation. 

 Madreporic plate decagonal in form, porous, bulky, including almost the 

 whole of the apical disk. The 5 genital pores, rather large, appear on the 

 border of the madreporite. The ocular plates, somewhat triangular, show 

 a little pore on their outer border. Peristome invisible in the specimen 

 described. Periproct small, a little separated from the margin. 



There is quite a series of specimens of this species from Antigua. The 

 best-preserved one, which is figured, measures 88 mm. in length, 78 mm. 

 in width, and about 30 mm. in height. This specimen is proportion- 

 ately much wider than typical. The apical disk is a little anterior 

 to the center of the test, as it is also in Cotteau's figure, although 

 he does not mention it in his text. This specimen has 6 tubercles 

 on the ridges between the ambulacral furrows instead of 4 or 5 as 

 described in the type, but other specimens show fewer than 6. 



Oligocene, Antigua formation, from bluff on north side of Willoughby 

 Bay, Antigua, T. W. Vaughan collector, 1 figured specimen, U. S. 

 Nat. Mus. No. 328237. Also, with same data, 8 specimens, U. S. Geol. 

 Sur. station 6881, U. S. Nat. Mus. No. 328238. Cotteau records this 

 species from the "Miocene" of ingenio San Lino, Province of Santa 

 Clara, very rare, collection of Comisi6n del Mapa Ge61ogico de Espana. 



Clypeaster cryptopetalus, new species. 

 (Plate 6, Figures 3 to 5.) 



The following is a description of this species : 



Test rather small, elongate, subpentagonal, thick on the margins, flattened 

 above, moderately concave below. Much longer than wide. The speci- 

 mens, excepting one, are not at all compressed or worn, being in excellent 

 condition of preservation, so that the shape and characters can not be 

 ascribed to wear. The ambulacral petals are almost perfectly flush with 

 the surface and are extraordinarily inconspicuous. This is due to the 



