60 FOSSIL ECHINI OF THE WEST INDIES. 



rounded on the border, concave in the middle. Apical disk subcentral 

 [anterior to the center]. Ambulacral areas are narrow, elongate, nearly 

 straight, flush, narrowing at the tips, which, however, are widely open. 

 The posterior ambulacra I and V are a little longer than the others; porif- 

 erous areas are narrow, not depressed, with unequal pores; the internal 

 rounded, the external elongate, narrow, and oblique. The poriferous areas 

 only cease to be petaloid at a very short distance from the border. Tubercles 

 are scrobiculate, scattered, abundant, a little less crowded on the upper 

 face than in the marginal region. Peristome opening in a depression of 

 the lower face. Periproct transversely elongate, angular, placed very 

 near the border. 



There is only a single specimen in the Washington collection. It 

 measures 15.5 mm. in height, 33 mm. in length, and 29 mm. in width. 

 Of this species Cotteau says it is very rare, but he does not say how 

 many specimens he had, other than mentioning both the Cleve collec- 

 tion and the Museum at Upsala. The Cleve specimen differs so much 

 in measurement from Cotteau's figures, and moreover is so imperfectly 

 preserved, both dorsally and ventrally, that it is quite probable that 

 Cotteau figured and made use of the Upsala specimen rather than this 

 one in his description. This species is very close to Echinolampas 

 lycopersicus, the similarity being in general configuration, in the 

 anterior position of the apical disk, and in the large oval periproct. 

 Cotteau pointed out the resemblance to lycopersicus, but distinguished 

 it by the fact that the ambulacra are narrower, straighter, longer, and 

 less petaloid. The test is more concave ventrally and the periproct 

 is situated farther posteriorly. Guppy treated antillarum as a form of 

 ovumserpentis, but I think the previous comparison is much closer. 

 It is to be noted that lycopersicus is from the Oligocene, whereas both 

 antillarum and ovumserpentis are Eocene. 



Eocene, St. Bartholomew limestone, St. Bartholomew, Guppy 

 collection ex Cleve, 1 specimen, cotype, U. S. Nat. Mus. No. 115401. 

 The label refers this specimen to Cotteau's plate 3, figures 9 to 11, but 

 it seems more likely, from the discrepancies of the specimen and 

 figures, that these figures were taken from the Upsala Museum 

 specimen, which Cotteau mentions in his text. 



Echinolampas ovumserpentis Guppy. 

 (Plate 10, Figures 4, 5.) 



b.chinolampas ovumserpentis Guppy, 1866, Quart. Jour. Geol. Soc. London, vol. 22, p. 300, 

 plate 19, figs. 4o, b, 5, 6. Cotteau, 1875, Kongl. Sven. Vet. Akad. Handl., vol. 13, 

 No. 6, p. 20, plate 3, figs. 13 to 21; 1897, Bol. Com. Mapa Geol. Espana, vol. 22. 

 p. 62, plate 16, figs. 5 to 9. 



The following is an extract from Cotteau's description of this species : 



Species of medium size, elongate, narrow, and rounded anteriorly; a 

 little dilated and truncate posteriorly. Upper face high, more or less 

 rounded above, sometimes subdepressed, having its greatest height cor- 

 responding to the apical disk; lower face strongly cushion-like, rounded 

 on the borders. The apical disk is nearly central, more often a little pos- 



