DESCRIPTION OF GENERA AND SPECIES. I5!I 
of short, obscure glabellar furrows close to the dorsal furrow; the occipital furrow 
is indicated by a short, scarcely discernible depression toward the side of the union 
of the glabella and occipital ring; occipital ring a little narrower than the glabella 
and extended backward into an extraordinarily strong spine, which is nearly as broad 
as the glabella, to a point corresponding in length with the glabella; the posterior 
termination of the spine is not preserved; on the side view the surface of the gla- 
bella extends backward continuously with that of the occipital ring and spine, on the 
same plane; the strong backward extension of the glabella recalls some of the large 
occipital spines in some species of Microdiscus; dorsal furrow deep, and strongly 
developed on the sides and in front of the glabella. 
Fixed cheeks about as wide as the glabella, strongly convex, and merging 
into a convex frontal limb that is wider and more convex than the fixed cheeks; 
palpebral lobes small; a narrow, clearly defined palpebral ridge extends obliquely 
backward across the fixed cheek from the antero-lateral angle of the glabella. 
Surface minutely granular under a very strong lens. The type specimen has 
a length of 5 mm., exclusive of the combined occipital ring and spine. 
This species is most nearly related to I. melie [p. 153] and I. ? acalle [p. 150]. 
It differs from them in the form of the convex fixed cheeks and frontal limb, the pres- 
ence of palpebral ridges, the extraordinarily strong occipital spine, and in having a 
proportionately shorter glabella. 
Formation and Locality—Middle Cambrian: (C75) Limestone near the base 
of the Ki-chéu formation [Willis and Blackwelder, 1907, p. 143], 4.5 miles (7.2 km.) 
south of Wu-t’ai-hién, Shan-si, China. 
Collected by Eliot Blackwelder. 
Inouyia capax (Walcott). 
Plate 14, Figures 11, 11a. 
Agraulos (?) capax WaLcoTt, 1906, Proc. U. S. Nat. Mus., vol. xxx, p. 580. (Species described and 
discussed essentially as below.) 
As indicated by the central portions of the cephalon exclusive of the free cheeks, 
the cephalon of this species is semicircular in outline, and moderately convex. The 
glabella narrows slightly from the base to its rounded front, which springs from the 
point where the palpebral ridges pass into the dorsal furrow; the surface of the 
glabella is marked by three pairs of short, slightly impressed glabellar furrows that 
divide the glabella into a posterior subtriangular lobe, two narrow lobes, and a 
larger front terminal lobe; occipital furrow rounded, not very deep, and slightly 
wider at the sides than in the center; occipital ring narrow at the sides, widening 
toward the center, where there is a low, small node near the posterior margin; dorsal 
furrow narrow, deep in front, and shallow at the sides of the glabella. 
Fixed cheeks broad, rising gently from the dorsal furrow to the palpebral lobes; 
they slope gradually to the posterior furrow, and, in front of the palpebral ridges, 
rather rapidly to the broad furrow defining the frontal limb; palpebral lobe small, 
narrow, and passing in front into a narrow palpebral ridge, which crosses the fixed 
cheek to the antero-lateral angle of the glabella; frontal limb separated from the 
glabella by a narrow, deep furrow, which widens out on each side; the limb is 
strongly convex immediately in front of the glabella, where it rises on some examples 
into a transverse boss; in other specimens it is not much higher than the general 
elevation of the glabella. 
Surface marked by shallow, irregular, minute pits when examined with a strong 
lens. The cephalon of the largest specimen in the collection has a length of 7 mm., 
with a width of 12 mm. at the palpebral lobes. 
