﻿SCHUI HERT] 



SI 1. URIC AND DEVONIC CYSTIDEA 



219 



Pectinirhombs each with from 25 to 35 dichopores. 



Hydropore on plate 23 comparatively large and easily seen; imme- 

 diatel) behind it is a shallow pit with numerous pores, indicating the 

 madreporite. 



Anal area very prominenl owing to the elevated anal mar-ins of 

 plates 7, 8, 13, and 14, and composed of an outer circle of 17 small 

 pieces and a highly elevated pyramid of 7 pieces. 



Column unknown. 



Formation and locality. — The two specimens were found by Mr. 

 Gordon in the cystid beds at the quarries near Keyser, West Virginia. 

 The paratype is in Mr. Gordon's collection. 



Cat. number 35,063, U. S. X. M. 



TETRACYSTIS FENESTRATUS n. sp. (Troost) 

 (Plate XXXIV, figures 6-8) 

 Echinocrinites fenestratus Troost, Amer. Jour. Sci. (2), vm, 1849, p. 419 



(nomen 1111(111111). 

 Echino-encrinites fenestratus Troost, Proc. Amer. Assoc. Adv. Sci., n, 

 1850, p. 60 (nomen nudum). 1 



Fig. 26. — Analysis of Tetracystis fenestratus n. sp. (Troost). 



1 Professor Troost died August 14, 1850, about one year after his paper was 

 read by Professor Agassiz " in the absence of the author " at the second, or 

 Cambridge meeting, August, 1849, of the A. A. A. S. The full manuscript 

 title of this paper, which is now in the U. S. National Museum, is " Mono- 

 graph on Crinoids (?) discovered in the state of Tennessee by Dr. G. Troost." 

 The manuscript was received by the Smithsonian Institution, July 18, 1850, 

 and was then sent to Agassiz for revision. In Meek's letters, preserved by 

 the Smithsonian Institution, there is one from Dr. B. F. Shumard as follows: 



"New Harmony, Ind., Jan. 20, 1851. 

 "... The Monograph by Troost on the Crinoids of Tennessee will prob- 

 ably not be published for some months yet. It is now in the hands of Agas- 

 siz and Wyman for revision." 



