2502 PALEONTOLOGY OF NEW-YORK. 
Fig. 24. A small individual, preserving the thorax and the maxillary portion of the buckler, the glabella 
being separated. Specimens of this kind are not rare among the young individuals. 
Fig. 22. The maxillary shields, as they frequently occur in the slate, separated from any other part of 
the fossil. The position and partial form of the base of the eye is clearly distinguishable. 
Fig. 2k. A single maxillary shield of this species. 
It is impossible, from the slender and fragile nature of these portions of the fossil, to 
decide whether the suture continues entirely across the front of the glabella, or is interrupted 
as in other species of Catymene. The specimen 27, shows a continuous slender fillet 
in front; but this may be joined to the lateral portions by sutures, since the specimen fig. 
2 k terminates as in Calymene senaria. 
Position and locality. It has already been observed that this species is more abundant in 
the Utica slate than elsewhere, being in fact the only trilobite usually seen in that rock. 
Large surfaces of the laminz are often almost entirely covered with the fragments and 
more or less perfect individuals. The most prolific localities are Coldspring, on the Erie 
canal, Montgomery county ; Oxtungo creek, above Fort Plain; Martin’s Hill, near 
Amsterdam ; Turin, Lewis county ; and less abundantly at Utica and numerous other 
localities. (State Collection.) 
Piate LXVII. 
Atops trilineatus. Emmons, Tac. System, pag. 20. 
= _— Ip. Agr. Report, pag. 64. 
Fig. 4a. The buckler, with a few of the articulations of the thorax. The specimen is very much 
compressed, and the crust removed. It is imbedded in a gritty micaceous slate, and in such a 
condition as to render it somewhat obscure. The form of the buckler, with the lobate 
character of the glabella, leave no doubt of the true nature of the fossil. 
Fig. 4 6. A specimen of the same fossil, presenting nearly the entire length of the individual; the 
form and markings of the buckler are obscure, but still visible, and evidently identical with 
the fossil from the Utica slate. 
Fig. 4c. An impression of the body of this fossil, showing the indentations produced by the short 
spines upon the back. 
Fig. 4 d. A portion of the same enlarged, showing the impressions of the fine granulations of the crust. 
Fig. 4 e, This fragment preserves an impression of a part of the central and one lateral lobe of this 
species. (See Emmons’ Taconic System, pag. 19, pl. 2, fig. 3; and Agricultural Report, 
pag. 63, pl. 14, fig. 3.) 
These specimens are all in the thinly laminated, folded, and partially altered slates, on 
the east side of the Hudson. The occurrence of these fossils is sufficient evidence of the 
age of the strata, without the evidence furnished in the structure of the country as presented 
in the sections. This species likewise occurs in the unaltered slates of the Hudson-river 
group, in Lewis, Jefferson and Oswego counties. 
