SYSTEMATIC DESCRIPTIONS SPATANGINA. 67 



U. S. Nat. Mus. No. 115372. Slope about 100 feet above sea-level, 

 between Little Harbor and Pelican Point, of Crocus Bay, Anguilla, 

 T. W. Vaughan collector, 1914, 1 specimen, U. S. Geol. Sur. station 6971. 

 Lambert records 3 specimens from the "Miocene" of Antigua, where it 

 appears to be less rare than at Anguilla, collected by J. W. Gregory in 

 1899, collection of British Museum. Jique de la Argolla, Rio Seco de 

 San Antonio, Guantanamo, Cuba, C. T. Ramsden collection, 2 specimens. 

 Bissex Hill formation, Barbados (fide R. J. L. Guppy, 1911). 



Family PLESIOSPATANGID^E Duncan, 1889. 

 Genus ASTEROSTOMA Agassiz, 1847. 



Type species. Clypeaster excentricus Lamarck. See below. 

 There are 2 species of Asterostoma that have been recognized as occur- 

 ring fossil in the West Indies. 



Key to the West Indian Fossil Species of Asterostoma. 



Peristome subcentral; ambulacra II and IV at ambitus about one-fifth as wide as inter- 

 ambulacra 1 and 4 A . excentricum 



Peristome anterior; ambulacra II and IV at ambitus about two-fifths as wide as inter- 

 ambulacra 1 and 4 A . cubense 



Asterostomma excentricum (Lamarck). 



Clypeaster excentricus Lamarck, 1816, Anim. sans Vert., vol. 3. p. 15. 



Asterostoma excentricum Agassiz, 1847, Catalogue Raisonne, Ann. Sci. Nat., ser. 3, vol. 7, 

 p. 168. Cotteau, 1871, Mem. Soc. Geol. de France, ser. 2, vol. 9, p. 183; 1897, 

 Bol. Com. Mapa Geol. Espafia, vol. 22, p. 65, plate 20, figs. 1, 2. 



This species, of which Cotteau had only a single specimen, which is 

 in the Zoological Museum in Paris, is of doubtful locality, but Cotteau 

 thinks, from the lithological character of the rock, that it comes from 

 the same region as A . cubense Cotteau and Pseudasterostoma jimenoi 

 (Cotteau), both of which were described from the Eocene of Cuba. 



Asterostoma cubense Cotteau. 



Asterostoma cubense Cotteau, 1870, Comptes Rendus de 1'Acad. des Sci., vol. 70, p. 273; 

 1871, Mem. Soc. Geol. de France, ser. 2, vol. 9, p. 181, plate 16, figs. 2 to 4; plate 17, 

 figs. 2 to 4; 1875, Kongl. Sven. Vet. Akad. Handl., vol. 13, No. 6, pp. 6 and 46; 1881, 

 Ann. Soc. Geol. Belgique, vol. 9, p. 27; 1897, Bol. Com. Mapa Geol. Espafia, vol. 

 22, p. 67, plate 21, figs. 1, 2. 



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

 in the Annals of the Geological Society of Belgium : 



Species of large size, a little elongate, rounded anteriorly, more narrow 

 and slightly tapering posteriorly; upper face high, swollen, thick on the 

 borders, sloping posteriorly, having its greatest height through the apical 

 disk and its greatest width about the middle of the ambitus. Lower face 

 nearly flat, concave at the approach to the peristome. Apical disk excentric 

 anteriorly. The anterior ambulacrum III is very different from the others, 

 flush with the test, widening toward the ambitus, having the poriferous 

 areas with very small equal pores disposed in pairs. The paired ambulacra 

 are very much more obvious, straight, descending low. The pores dorsally 

 are unequal, the external elongate, the internal rounded, disposed in pairs 



