498 PROCEEDINGS OF THE NATIONAL MUSEUM. TOt.63. 



cover the dorsal surface of the test, and ventrally the tubercles are 

 larger excepting on the lines of ambulacral furrows, where they are 

 minute or wanting. Details of the apical disk, peristome and peri- 

 proct are entirely wanting. This species does not make a close 

 approach to any other known species, but its nearest ally is Encope 

 macrophora Ravenel from the upper Miocene of South Carolina and 

 the Pliocene of Florida.* 



Locality and geologic occurrence. — Gatun formation, upper Oligocene 

 or Miocene, Panama Canal Zone. From 85-foot cut north side of big 

 swamp on relocated line, Panama R. R., about one and one-half to 

 two miles beyond Camp Cotton towards Monte Lirio, D. F. Mac- 

 Donald and T. W. Vaughan, collectors, 1911. Fourteen specimens, 

 including fragments, U. S. National Museum station No. 6030. 



Type.— Cat. No. 32445G, U.S.N.M. 



ECHINOLAMPAS SEMIORBIS Guppy. 



Echinolampas semiorbis Gttppy, On Tertiary Echinoderma from the West Indies. 

 Quart. Journ. Geol. Soc. London, vol. 22, 1866, p. 299, pi. 19, fig. 7.— Cotteau, Echin- 

 idea Tertiares des lies St. Barth^lemy et Anguilla. Kongl, Svensk, Vetenskaps. 

 Akad, vol. 13, 1875, p. 24, pi. 5, figa. 1-2; pi. 6, fig. 1. 



This species is abundant in the Oligocene Tertiary of the West 

 Indies, material from Anguilla having been described by Guppy, and 

 Cotteau erroneously records it from St. Bartholomew. Dr. T. Way- 

 land Vaughan in 1914 collected abundant, fine specimens in the Island 

 of Anguilla. 



From the Panama Canal Zone a number of specimens were col- 

 lected from a hard gray limestone. The specimens are for the most 

 part uncompressed and in very good condition of preservation. 

 One of the largest specimens measures 107 mm. in length, 103 mm. 

 in width, and 53 mm. in height. 



Locality and geologic occurrence. — Oligocene. Emperador limestone, 

 Panama Canal Zone. Upper Limestone bed near Tower "N" (oppo- 

 site Las Cascadas, Gaillard cut), D. F. MacDonald, collector, 1911, 

 U. S. National Museum station No. 5866&, one specimen, U. S. Nat. 

 Mus. Cat. No. 324457. Also Panama Canal Zone, from 5th or top- 

 most hmestone, Gaillard cut, opposite Las Cascadas, U. S. National 

 Museum station No. 6019G, D. F. MacDonald and T. W. Vaughan, 

 collectors, 1911, 4 specimens. U. S. Nat. Mus., Cat. No. 324458. 



SCHIZASTER ARMIGER W. B. Clark. 



Sdtizaster armiger Clark and Twitchell, Mesozoic and Cenozoic Echinodermata 

 of the United States. Monograph U, S. Geol. Survey, vol. 54, 1915, p. 152, pL 70, 

 figa. la-d. 



In this species the test is rather large, cordiform; upper surface 

 slopes at first rapidly, then more slowly from the anterior margin to 



• Clarlc, William Bullock, and Twitchell, Mayville W. Mesozoic and Cenozoic Echinodermata ol the 

 United States. Monograph, U, S. Geol. Survey, vol. 54, 1915, p. 206, pi. 93. figs. 2o-e; pi. 94, figs, la-/- 



