VOL. IX, pp. 89-97, PL. I MARCH 30, 1894 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



NOTE ON SOME APPENDAGES OF THE TRILOBITES, 

 BY CHAS. D. WALCOTT. 



The results of Mr. W. S. Valiant's long search for the ap 

 pendages of trilobites have recently been made known by Mr. 

 W. B. Matthew, who described the material sold to the Columbia 

 College of New York by Mr. Valiant.* Mr. Valiant informs 

 me that he discovered traces of what he considered to be anten 

 nae, and that for several years he continued collecting until he 

 found a locality where the specimens were well preserved and 

 show, not only the antennae, but legs and what he supposed to 

 be the swimming appendages. Not having confidence that he 

 could properly describe the specimens he sold part of his ma 

 terial, and in this way it came to be first described by Mr. Mat 

 thew, a student at Columbia College. His step-brother, Mr. 

 Mitchell, continued to collect; and in August, 1893, through the 

 courtesy of Mr. Valiant, I visited the locality with Mr. Mitchell 

 and obtained a few specimens for the National Government. 



The most important part of the discovery, announced by Mr. 

 Matthew's paper, is that the trilobita have true antennae. The 

 discovery of the legs and plumose appendages is also of great 

 interest, as it adds to our information respecting the appendages 

 of the trilobite some of the details of another genus. 



A collection was made for the Yale College Museum by Dr. 



Read March 24, 1894. 



*Am. Jour. Sci., Vol. 46, 1893, p. 121. 



