OF DENISON UNIVERSITY. 
59 
tion of the ribs behind the keel. Length of head, 6 mm. , length of 
glabella, 4 mm. , width, 3 mm. Length of pygidium, 7 mm. , width, 
9-10 mm. 
This beautiful species is found at Moot’s run 70 to 80 feet below 
congl. I. The pygidium is very .like that of P. occidentalis but the 
greater coarseness of the ribs and the spinous armature with minor 
features serve to distinguish the species, which differ more widely in 
the characters of the head. 
Calcareous concretions seventy feet below conglomerate I, Lick- 
ing and Ashland counties. 
PHAETHONIDES? IMMATURUS, sp. n. 
(Plate I, Figs. 9 and 15.) 
This species is known only from pygidia, none of which preserve 
the characters perfectly. It is quite possibly this is the species described 
by Meek as Phillipsia lodiensis but in as much as it is not found on the 
same horizon it seems better to distinguish it. 
Pygidium rather flat in all specimens seen, semi-elliptical, axial 
portion with about twelve lobes, rather rapidly tapering, pleura with 
duplicate ribs anteriorly, about eight being visible, extending out upon 
the rather narrow but obvious margin where they are slightly nodose, 
median and lateral lobes ornamented by about three large distant 
tubercles. This is a very small species occurring 100 feet above con- 
glomerate II, at Newark and also in the upper layers at Cuyahoga 
Falls. Fig. 9 is from the latter place and considerably enlarged by 
camera. It has been called P. lodiensis by collectors. 
PHAETHONIDES (?) LODIENSIS, Meek. 
(Geol. Surv. O. vol. ii. Palaeon. Plate XVIII.) 
The figures of this species make it probable that it is congeneric 
with P. spinosus and it is apparently but little above it stratigraph- 
ically. Collectors seem to have confused with it our P. immaturus or 
other species from a higher horizon. The form of glabella with the 
long median lobe ally it with some forms of Proetus. 
