Page:Walcott Cambrian Geology and Paleontology II.djvu/136

80 collected in a low bluff on the shore of Tschang-hsing-tau island, east of Niang-niang-kung, Liau-tung, Manchuria, China.

Collected by J. P. Iddings and Li San.

This species is represented by four specimens of the pygidium. It is quite unlike the pygidium referred to P. busiris Walcott and with the discovery of entire specimens of the dorsal shield it may be found that the generic reference is incorrect.

The pygidia average 4 mm. in length and are finely preserved in the compact limestone matrix.

Formation and locality.—Middle Cambrian: (35n) Fu-chóu series; limestones near the base of the series just above the white quartzite, collected in a low bluff on the shore of Tschang-hsing-tau island, east of Niang-niang-kung, Liau-tung, Manchuria, China.

Collected by J. P. Iddings and Li San.

The species referred to this genus are represented only by the cranidium. This in the genotype has a swollen, tumid frontal limb, small palpebral lobes, a convex and more or less subrectangular glabella, strong dorsal furrows about the glabella, and clearly marked glabellar furrows.

Surface apparently smooth, but with a strong lens it has a slightly roughened appearance caused by a shallow, irregular pitting.

Genotype.—''Agraulos ? capax'' Walcott (pl. 14, fig. 13).

The swollen frontal limb, small palpebral lobes, and convex glabella at once suggest Agraulos (see pl. 15) and in fact all of the species now referred to Inouyia with the exception of I. titiana (Walcott) were at first referred to Agraulos. My reasons for separating them and creating the genus Inouyia are that the tumidity of the frontal limb is so pronounced as to become a marked feature and the glabella is more rectangular in the typical species. To these should be added the general effect of the cranidium when compared directly with the cranidium of Agraulos ceticephalus (Barrande). I think it quite probable that when entire specimens of the dorsal