246 C. D. Walcott — Appendages of Trilohites. 



lobes being much more conspicuous, and by tbe greater breadth 

 of the frontal lobe. 



The third species deserving comparison is Ph. Wesenbergensis 

 (Schmidt) [loc. cit. p. 115). This bears the closest resemblance to 

 our form. The shape of the head, the genal spines, the granular and 

 tubercular surface of the glabella, the border to the head-shield, and 

 the second and third side lobes of the glabella are all very similar. 

 The first lobe is usually smaller, but Schmidt states that its form 

 varies considerably. The most important points of difference are 

 the smaller size of the eyes, the non-tuberculate character of the 

 cheeks, and the absence of a conspicuous fulcrum to the pleurge. 



On the whole it seems, therefore, justifiable to consider our 

 Coniston Limestone form specifically distinct from any hitherto 

 described ; and in honour of its discoverer it may suitably be 

 named Ph. Marri. 



EXPLANATION OF PLATE VII. 



Fig. 1. Natural cast of Fhacops {Chasmops) Ifarri from the Coniston Limestone, 

 Apple til waite Common, Windermere. Natural size. 



Fig. 2. Impression of ditto. 



Fig. 3. Side view of figure 1, showing genal spine. 



Fig. 4. Dindymene Sughesice (Roberts MS.), Coniston Limestone Series, Norher 

 Brow. 



Fig. 5. Impression of ditto. 



N.B. — By mistake the figure of the type specimen on which the 

 restoration of Dindymene Hughesice was founded (Geol. Mag. Dec. 

 IV. Vol. I. No. III. PI. IV. Fig. 5) was omitted from the plate 

 which accompanied the description in the March Number. It is, 

 therefore, here inserted. 



II. — Note on Some Appendages of the Trilobites.^ 



By Chas. D. Walcott, F.G.S. 



PalaBoutologist to the United States Geological Survey ; Smithsonian Institution, 



Washington, D.C, U.S.A. 



(PLATE VIII.) 



THE results of Mr. W. S. Valiant's long search for the appendages 

 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 antennse, and that for 

 several years he continued collecting until he found a locality where 

 the specimens were well preserved and showed, 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 material, and in this way it came to be first 

 described by Mr. Matthew, 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 



1 Eead before the Biological Society of Washington, March 24, 1894. 



2 Amer. Journ. Sci. 1893, vol. xlvi. p. 121. 



