SYSTEMATIC DESCRIPTIONS CLYPEASTRINA. 39 



History, No. 18577. Cotteau gives his type as from the "Miocene," 

 Matanzas, Cuba, very rare ; collection of Comisi6n del Mapa Geologico 

 de Espana. Lambert reports specimens from the "Miocene" of Antigua, 

 collected by J. W. Gregory, 1899, collection of British Museum. It 

 is of interest that this species, as described by Jackson, occurs in the 

 Oligocene, Emperador limestone, of Las Cascadas, Panama, U. S. 

 Nat. Mus. No. 324452 ; also at a nearby locality opposite Las Cascadas, 

 Gaillard Cut, U. S. Nat. Mus. No. 324451. 



Clypeaster antillarum Cotteau. 

 (Plate 5, Figures 1, 2.) 



Clypeaster antillarum Cotteau, 1875, Kongl. Sven. Vet. Akad. Handl., vol. 13, No. 6, p. 15, 



plate 2, figs. 1 to 3. Guppy, 1882, Scientific Assoc. Trinidad, Proc., part 12, p. 195. 



Cotteau, 1897, Bol. Com. Mapa, Geol. Espana, vol. 22, p. 35, plate 7, figs. 1 to 3. 



Lambert, 1915, Mem. Soc. d'Agric. de 1'Aube (Troyes), vol. 79, p. 25. 

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



Cotteau, see p. 56. 

 Diplothecanthus antillarum Brown, 1914, Proc. Acad. Nat. Sci., Philadelphia, vol. 65, p. 601. 



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



Species of large size, subpentagonal, a little angular anteriorly, truncated 

 squarely posteriorly; upper face moderately swollen, thick and subsinuous 

 on the border; lower, face nearly flat in the inframarginal region, strongly 

 concave in the middle, marked with 5 ambulacra! grooves, which are pro- 

 nounced at some distance from the border and descend in to the peristome. 

 Apical disk subcentral, a little posterior to the center. Ambulacra swollen, 

 strongly petaloid, scarcely open at their extremities, unequal, the anterior 

 ambulacrum longer and narrower than the others; poriferous areas very 

 wide, with pores rounded, united by a groove; interporiferous areas rela- 

 tively little developed. Peristome subpentagonal, deeply sunken. Periproct 

 small, near the border, subelliptical in the transverse diameter. 



One splendid specimen in the National Museum measures 33.5 mm. 

 in height, 123 mm. in length, and 112 mm. in greatest width across 

 ambulacra II and IV. This species is undoubtedly near to rosaceus, 

 but the form of the interporiferous areas is entirely different. Besides 

 the type in the Cleve collection, 2 fine specimens from Cuba in the 

 American Museum are ascribed to this species. 



Oligocene, Anguilla formation, island of Anguilla, Guppy collection 

 ex Cleve, holotype, U. S. Nat. Mus. No. 115390. Disintegrated lime- 

 stone near asylum in quarry near Guajay, 15 miles southwest of 

 Havana, Cuba, 2 specimens, American Museum of Natural History, 

 No. 18578. Consolaci6n del Sur, Province of Pinar del Rio, Cuba, 

 collected by the alcalde, 1901, U. S. Geol. Sur. station 3474. Gregory 

 reports this species from Antigua in 1895, it, with C. concavus, he says, 

 being the most typical species of the West Indian Oligocene. Dr. A. P. 

 Brown collected a specimen which he identified as antillarum in the 

 Antigua formation at Willoughby Bay, Antigua; it is rather indis- 

 tinctly preserved and is in the Philadelphia Academy Natural Sciences, 

 No. 1660. Lambert tentatively refers to this species a rather imper- 



