Page:Walcott Cambrian Geology and Paleontology II.djvu/148

92

This species is represented by specimens of the cranidium that have an unusually large and long palpebral lobe. This character is sufficient to distinguish it from other described species. The surface appears to be minutely punctate or marked by minute, shallow pits.

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.

Of the Chinese species of Anomocarella, the cranidium of this species may be compared with that of A. tatian (Walcott) in that the frontal limb curves more abruptly down toward the frontal margin than in most species of the genus, and the frontal margin also bends downward to a greater degree. The outline of the glabella and fixed cheeks is almost similar in the two species. The associated pygidia are more elongate than those referred to A. tatian and have a greater number of segments in the axial and pleural lobes.

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.

Dorsal shield of medium size, elongate-elliptical in outline, convex, with the axial lobe strongly defined and convex. Cephalon semicircular in outline, with the genal angles extended into short, sharp spines; a narrow, flattened border extends across the front of the cranidium and continues along the free cheeks until it passes into the genal spines; the posterior margin is narrow and distinctly defined by a strong, rounded furrow that terminates in the dorsal furrow beside the glabella. Cranidium with the front broadly rounded, narrow fixed cheeks, small antero-lateral limbs, and narrow