490 PROCEEDINGS OF THE NATIONAL MUSEUM. tol.63. 



Schizaster armiger W. B. Clark. Eocene, Bonilla, Costa Rica. 



Schizaster cristatus, new species. Upper Oligocene,^ Brazil, Costa 

 Rica, station 5505. 



Schizaster panamensis, new species. Upper Oligocene,' Gatun forma- 

 tion, near Gatun, at stations 6008 and 7294. 



DESCRIPTION OF THE SPECIES. 



CLYPEASTER LANCEOLATUS Cotteau. 



Plate 62, figs. 1, 2, 



Clypeaster lanceolatus Cotteau, Desoripcion de los Equinoides Fossilcs de la Isla 

 de Cuba. Bol. Com. del. MapaGeologico de Espana, vol. 22, 1897, p. 39, pi. 9, figs. 1, 2, 3. 



This species is one of the few in the series from the Panama Canal 

 Zone that seems referable to an already published species. There 

 are seven specimens, all in good condition of preservation and repre- 

 senting two locahties which, however, from the character of the 

 material may be nearly associated. I give measurements of the 

 largest specimen of the set. Length, 95 mm. ; width, 77 mm. ; height, 

 21 mm. Test elongate, wider behind than in front, moderately ele- 

 vated, deeply concave in ventral view. Ambulacral petals elevated, 

 distally acuminate, nearly closed and pinched up as if squeezed 

 between the thumb and finger. Anterior petal III equal in length 

 to petals I and V and a few millimeters longer than are the anterior 

 pair II and IV. The anterior petal III is more widely separated from 

 petals II and IV than are those latter from I and V. Interporiferous 

 areas of petals are elevated, wide, being about equal to both porif- 

 erous areas. Interambulacra are narrow, extremely so near the 

 apical disk. Tubercles are small and of about the same size dorsally 

 and ventrally. Apical disk is central, mouth central, deeply sunken, 

 periproct ventral, about four mm. from the posterior border of the 

 test. The original material described by Cotteau is from the "Mio- 

 cene" of Matanzas, Cuba, where he says it is very rare. It is appar- 

 ently more or less common in the Canal Zone, as there are seven speci- 

 mens from that region. 



Localities and geologic occurrence. — Oligocene; Emperador lime- 

 stone. Upper Limestone, Las Cascadas, Panama, D. F. MacDonald, 

 collector, U. S. National Museum station No. 6671, two specimens, 

 U. S. Nat. Mus. Cat. No. 324452; also Panama Canal Zone, upper 

 Limxcstono bed, near Tower "N" (opposite Las Cascadas, Gaillard 

 Cut) D. F. MacDonald, collector, 1911, U. S. National Museum station 

 No. 5866-&, five specimens, U. S. Nat. Mus. Cat. No. 324451. 



* This formation perhaps may more appropriately be referable to the lower Miocene, 1. e., Burdigalian. 

 For a recent discussion of the geologic age of the members of the Apalachicola group in Florida and 

 Georgia, see Vaughan, T. W., The reef-coral fauna of Carrizo creek, Imperial County, California, and It» 

 significance: U. 8. Geol. Survey, Prof. Pap. 98-T., pp. 363-366, 1917— T. W. V. 



