NO. 4 CAMBRIAN FAUNAS OF CHINA 79 



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. 



EMMRICHELLA, new subgenus of PTYCHOPARIA 



This subgenus differs from Ptychoparia in its smooth glabella and 

 larger palpebral lobe ; from Liostracus, in having an arched or nearly 

 flat frontal limb and rim and more convex cranidium ; from Con- 

 ocephalina, in its smoother glabella and wider fixed cheeks ; and 

 from Anomocare, in its smoother glabella, usual absence of distinct 

 palpebral ridge, proportionately shorter eye lobes, and glabella. 



Genotype. — Ptychoparia theano Walcott.' (pi. 14, figs. 9, 9a.) 



Observations. — This subgenus is characterized by a nearly smooth 

 surface on the glabella and fixed cheeks, rather large palpebral lobes, 

 and narrow postero-lateral limbs. Unfortunately, no entire speci- 

 mens of the cephalon and thorax are known, and the pygidia referred 

 to it may or may not belong to the species to which they are ten- 

 tatively assigned. Only when a thorough study is made of all the 

 material within the Conocephalinae will it be possible to make even a 

 fairly adequate grouping of the species. 



Of the species of this subgenus from China, P. (E.) theano (Wal- 

 cott, P. (E.) hromiis (Walcott), and P. (E.) criopia (Walcott) 

 have the posterior, elongate palpebral lobe. In P. (E.) mantoensis 

 (Walcott) and P. (E.) constricta (Walcott) the palpebral lobe is 

 much like that of Ptychoparia in its position. 



Stratigraphic range. — Ptychoparia (Enunrichella) mantoensis and 

 P. (E.) constricta occur at the summit of the Lower Cambrian; P. 

 (E.) eriopia and P. (E.) theano, at the base of the Ch'ang-hia 

 formation of the Middle Cambrian ; and P. (E.) hromus, at about the 

 same horizon in the Kiu-lung formation. 



CREPICEPHALUS CONVEXUS, new species 

 Plate 14, figs. II, iia 

 The cranidium of this species differs from that of C. damia (Wal- 

 cott) in its shorter frontal lobe, flatter frontal rim, and proportion- 

 ately longer glabella. The associated pygidium has a proportionately 

 shorter axial lobe and its sides curve outward instead of inward. 



Formation and locality. — Middle Cambrian : (35r) Fu-chou series; 

 limestones near the base of the series just above the white quartzite, 



'Walcott, 1905, Proc. U. S. Nat. Mus., Vol. 29, p. 82. 



