68 FOSSIL ECHINI OF THE WEST INDIES. 



on the outer borders of the ambulacral plates. These pores extend as far as 

 the ambitus, where they cease abruptly and are replaced by other pores, 

 smaller and scarcely visible. They spread out on the lower face at the 

 approach to the peristome and are lodged in depressions which widen and 

 extend directly to the mouth. Tubercles crenulate, perforate, and scrobicu- 

 late, unequal, abundant, and scattered all over the test, more crowded 

 toward the ambitus and ventrally, nearly wanting in the ambulacral depres- 

 sions. Granules are usually disposed in circles around the scrobicules. The 

 peristome is very excentric anteriorly, transverse, elliptical, and opening in a 

 depression of the lower side. Periproct posterior, a little above the ambitus. 

 Apical disk subcircular; madreporite slightly developed; the two pos- 

 terior genital plates and the two posterior oculars are separated by a com- 

 plementary plate [genital 5] which is imperforate, long, and angular, and 

 extends to the madreporite. 



As to measurements, Cotteau says the height is 66 mm., length 

 121 mm., and width 1 13 mm. Cotteau publishes a good figure of a com- 

 plete specimen in his Spanish report. It is there evident that the plate 

 which separates the genitals 1 and 4 and the oculars I and V is an exten- 

 sion of the posterior genital 5, which is imperforate. He says (1897) 

 that this species is very rare in the Eocene of Matanzas, Cuba, and the 

 unique specimen figured is in his own collection in Paris. In Cotteau's 

 (1875) memoir (p. 46) he says some specimens of large size from the 

 Eocene of St. Bartholomew, while very incomplete, are perfectly recog- 

 nizable as being this species by their high form, thickness, swelling, 

 absence of the anterior groove, the narrow ambulacral areas, which are 

 elongate, superficial, and the structure of the pores. He does not men- 

 tion the Cleve collection, which is probably an oversight, as on page 46 

 he does not cite any source of the material, as is his custom. On page 6 

 he does mention having specimens of this species from St. Bartholomew 

 in his own collection. Further, Guppy, in his 1882 paper, distinctly lists 

 Aster ostoma cubense as part of the material he received in the Cleve 

 collection, so that undoubtedly this is the material referred to by Cotteau. 



Eocene, St. Bartholomew limestone, St. Bartholomew, Guppy Collec- 

 tion ex Cleve; specimens described by Cotteau, 1875, p. 46, 2 speci- 

 mens, U. S. Nat. Mus. No. 115385. Cotteau gives as locality, Eocene, 

 Matanzas, Cuba; the single known specimen from Cuba is in his 

 collection in Paris. 



Genus PSEUDASTEROSTOMA Duncan, 1889. 



Type species. Aster ostoma jimenoi Cotteau. See below. 



Pseudasterostoma jimenoi (Cotteau). 



Aster ostoma jimenoi Cotteau, 1870, Comptes Rend. Acad. des Sci., vol. 70, p. 273; 1871, 

 Mem. Soc. Geol. de France, ser. 2, vol. 9, p. 180; pi. 16, fig. 1; pi. 17, fig. 1; 

 1897, Bol. Com. Mapa Geol. Espana, vol. 22, p. 69, plate 22. figs. 1, 2. 



Cotteau, in his Spanish paper, says that this species is very rare in 

 the Eocene deposits of Matanzas, Cuba; the unique specimen is in his 

 own collection in Paris. 



