314 
PALAEONTOLOGY OF NEW-YORK. 
673. 1. BRONTEUS'? NIAGARENSIS (». sp.). 
Pl. LXX. Fig. 3. 
Compare Bronteus laticauda, Beyrich, Uber einige Bohmische Trilobiten, 1845, pag. 42, pl. 1, 
figs. 8 and 9. 
Caudal extremity broad, somewhat semicircular ; axis defined, six or nine sulcations on each 
side. 
It is wit'll 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 cliff above. 
674. 1. ARGES PHLYCTANODES. 
Pl. LXX. Fig. 2 a, 6, c. 
Calymene phlyctanodes. Green. 
Compare Arges speciosus (Trochurus speciosus'), Beyrich, Uber Trilobiten. 
Buckled 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 Arges 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. 
Green, and I have presumed it to be the original one described by him, 
