TROOST *S CRICOIDS OF TENNESSEE E. WOOD. 



3 



of especial scientific interest, they are of historical interest, and they 

 give us a better acquaintance with the interesting personality of the 

 author. 



The monograph as presented at the Smithsonian Institution con- 

 tained 91 pages closely written by Troost's own hand, with complete 

 index and description of plates. It is fully illustrated, 243 figures 

 being used to illustrate the 108 species described. The drawings, 

 while effective as pictures, omit important details, and they have 

 been replaced in many cases by retouched photographs or original 

 drawings. 



The introduction to the monograph contains a general description 

 of the geology of Tennessee, followed by the descriptions of species 

 grouped under the following phylum and classes and in the following 

 order : 



Radiata [Echino derma]. 



Stellerides [Stelleroidea]. 

 Echinides [Echinoidea]. 

 Crinoidea. 



Several species belonging to the Cystoidea and Blastoidea are 

 described among the Crinoidea without separate heading. As here 

 published the species are rearranged in accordance with the classifica- 

 tion proposed by Dr. F. A. Bather [1900] for blastoids and crinoids 

 and to correspond with that of Jaekel [1899] for cystoids. 



The following title and dedication are quoted exactly from the 

 original manuscript. a 



A MONOGRAPH ON CRINOIDS (?)& 

 DISCOVERED IN THE STATE OF TENNESSEE. 

 By Dr. G. Troost. 



Prof. Chem. Miner, and Geology in the Nashville University, Geologist of the State of 

 Tennessee. Heretofore Officier de sante de la premiere classe au service de S. M. 

 Louis Napoleon Roi de Hollande. One of the seven founders, and first President 

 or the Academy of Natural Sciences of Philadelphia, Penn. Member of the Philo- 

 sophical Society in Philadelphia; Member of the American National Institute; 

 member of the Geological Society of France; corresponding member of the Jardin des 

 plantes; member of the Society of Natur- and Letterkunde in The Hague, — of the 

 American Ethnological Society in New York, — of the Western Academy of Natural 

 Science in St. Louis, Missouri, — of the Historical Society in Nashville, Tenn. etc. 



DEDICATION. 



Nashville, October, 1849. 



To the Citizens of Nashville, 



Fellow Citizens: — I take great pleasure in dedicating this work to you. It is the 

 result of several years' research and travel, and I owe it to you that I have been able 



a Quotations from Doctor Troost 's manuscript are printed in small type, with inser- 

 tions by the author inclosed in square brackets. 



b Troost 's material contained cystoids, blastoids, crinoids, asteroids, and a pseudo- 

 morph of uncertain affinities. — E. W. 



