78 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 57 



Formation and locality. — Lower Cambrian: (C17) ferruginous 

 limestone nodules in the brown sandy shales at the top of the j\Ian-t'o 

 shale, at Ch'ang-hia, Shan-tung, China. 



Collected by Eliot Blackwelder. 



PTYCHOPARIA KOCHIBEI, new species 



Plate 14, figs. 10, loa 



The cephalon of P. kochibei, in outline, wide fixed cheeks, broad 

 frontal limb, and broadly rounded front margin of the gabella, is 

 similar to the cephalon of Ptyclwparia granosa Walcott (pi. 14, fig. 

 8). It differs in having a more pronounced swelling of the frontal 

 limb in front of the glabella, more tumid fixed cheeks, and in surface 

 characters. The surface of P. granosa is thickly studded with minute 

 tubercles, while that of P. kochibei is smooth or possibly finely punc- 

 tate ; its frontal limb is also marked by fine, irregular, sometimes 

 inosculating, rounded ridges that extend from in front of the glabella 

 and palpebral ridges to the groove within the flattened frontal rim 

 (pi. 14, fig. loa). 



The thorax has fourteen transverse segments with a narrow axial 

 lobe and wide pleural lobes. The pleural furrow starts on the inner 

 front side of the pleural lobe of each segment and, widening nearly to 

 the width of the segment, begins to narrow at the point of geniculation 

 and terminates near the posterior margin at the somewhat abrupt 

 falcate termination of the pleura. 



Pygidium small ; the axial lobe is crossed by two furrows that 

 serve to outline two transverse rings and a terminal section ; tv/o 

 anchylosed segments are outlined on the pleural lobes on each side 

 of the axial lobe by furrows that curve gently backward toward the 

 faintly defined border. 



Surface finely punctate or slightly roughened by minute depres- 

 sions. 



Observations. — This is the only Chinese species of PtycJwparia 

 of which we have the entire dorsal shield ; all the other species are 

 represented by the separated parts. In outline the dorsal shield is 

 not unlike that of Ptychoparia kingi (Meek),'^ and it may be consid- 

 ered as the Chinese representative of that species. 



The specific name is given in honor of the former Director of the 

 Geological Survey of Japan, Doctor Kochibe. 



Formation and locality. — Middle Cambrian: (35n, 35r. and 36e) 

 Fu-chou series ; limestones and shales interbedded with limestones 



' Walcott, 1886, Bull. U. S. Geol. Survey, No. 30, p. 193. 



