No. 2218. FOSSIL ECHINI OF PANAMA CANAL ZONE—^ACKSO\. 495 



The apical disk is quite well preserved, shows clearly the ocular 

 pores and lour of the five genital pores, which are a characteristic 

 feature of Encope. The only genital wanting is that occurring in 

 area 1, which is destroyed by a local fracture of the tost. Minute 

 tubercles cover the dorsal side of the test. Ventrally the tubercles 

 are larger except near the ambulacral furrows where they are minute. 



Encope platytata is a near ally of Encope tenuis Kow * of the Miocono 

 of California, but differs from that species in that the greatest height 

 of the tost is central, and the poriproct is confluent with the lunulo. 



V ..' 



fio. i —Encope Platytata. Drawing of toe type-specimen, natural size. Restorations abb 



INDICATED BY DOTTED LINES. 



Licality and geologic occurrence. — Gatun formation, upper Oligocone 

 or Miocene, Panama Canal Zone, from lowest horizon in big cut, one- 

 fourth to one-half mile beyond Camp Cotton toward Monte Lirio, 

 D. F. MacDonald and T. W. Vaughan, collectors, 1911, U. S. National 

 Museum station No. 6029a, one specimen. 



Type.— Cat, No. 324455, U.S.N.M. 



' Kew, W. S. W. Tertiary echinoids of the Carrizo Creek Region in the Colorado Desert. University of 

 California null., Dept. Geology, vol. 8, no. 5, pp. 39-60, pis. 1-3, 1914. 



