314 



PALEONTOLOGY OF NEW-YORK. 



673. 1. BRONTEUS'? NIAGARENSIS {n. sp.). 



PL. LXX. Fig. 3. 



Compare Bronteus laticauda, Beyrich, Uber einigc Bohmische Trilobiten, 1845, pag. 42, pi. 1, 

 figs. 8 and 9. 



Caudal extremity broad, somewhat semicircular ; axis defined, six ornine sulcations on each 

 side. 



It is with some hesitation that I refer this fragment to the Genus Bronteus. The articu- 

 lations appear to terminate in a broad expanded border like the species of that Genus, but the 

 specimen is clearly imperfect, and being in a granular limestone, it can not be decided posi- 

 tively that they may not extend in laciniate points as in Lichas. In fact it may perhaps be 

 another species of that genus. The specimen, however, has more the aspect of Bronteus 

 than of Lichas, and it is quite different from L. boltoni. 



Fig. 3. The imperfect caudal shield. 



Position and locality. The specimen was taken from a large fragment of limestone in the 

 Niagara river below the Canada fall. The limestone is evidently from the cliflF above. 



674. 1. ARGES PHLYCTANODES. 



PL. LXX. Fig. 2 a, b, c. 

 Calymene phlyctanodes. Green. 

 Compare Jlrges speciosus {Trochurus speciosus'), Beyrich, Uber Trilobiten. 



Buckler extremely arched in the middle ; central lobe' elongate oval, very prominent in the 

 middle ; a short lateral lobe on each side, which is rounded in front and narrowed behind, 

 extending not quite so far as the glabella ; a prominent node on each side, between the eye 

 and the longitudinal furrow ; anterior border prominent, and marked by a row of short spine- 

 like processes ; posterior margin marked in like manner. Entire surface covered with short 

 spine-like pustules with smaller ones between : in the depression at the base of the glabella 

 are three distinct short spines. 



The specimen figured is the only one that I have obtained : it consists of the central portion 

 of the head, the sides beyond the facial suture being separated. The remarkable convexity 

 and protuberance of the central lobe is quite sufficient to distinguish this fossil, which possesses 

 all the important characteristics of the Genus Arges. The character of the pustulo-spinous 

 surface is very remarkable, and quite unlike any other trilobite of the group. Judging from 

 the form of the base, the eyes were roundish and very protuberant. 



Our species is closely allied to Jlrges speciosus {Trochurus speciosus), Beyrich; but the 

 anterior lateral lobes do not reach as far back in that species, and in ours there is no small 

 prominence behind the second lateral lobe. 



There is a specimen of this species in the collection of the Academy of Natural Sciences, 

 labelled Calymene phlyctanodes, in the same manner as other specimens labelled by Prof. 

 GreeNj and I have presumed it to be the original one described by him. 



