THE LARGER FAUNAL HORIZONS. 55 
Hysterolenus sp. (C38) Illenurus ceres (C38) 
Hysterolenus ? (C56) Illenurus dictys (C56) 
Tllenurus canens (C34, C38, C54) Illenurus sp. undt. (C 54) 
The fauna of the upper portion of the Ch’au-mi-tién limestone is best 
represented from 50 to 75 feet (15 to 23 m.) below the summit of the lime- 
stone. It contains a characteristic grouping of genera and species, as follows: 
Obolus damesi (C 64) Orthotheca cyrene (C47, C64) Ptychaspis callisto (C 64) 
Eoorthis doris (C64) Coosia ? bianos (C64) Ptychaspis calyce (C64) 
Eoorthis kayseri(C64,C68,C74) Anomocare sp. (C64) Ptychas pis ceto (C45, C64) 
Eoorthis linnarssoni (C64) Anomocarella baucis (C 36) Ptychaspis sp. undt. (C64) 
Huenella orientalis (C64) Anomocarella? sp.undt.(C68) Ptychaspis sp. (C47, C50) 
Syntrophia orthia (C64) Ptychaspis acamus (C45) Chuangia batia (C64) 
Billingsella pumpellyi (C 36) Ptychas pis baubo (C64) Chuangia nais (C64) 
Pelagiella clytia (C 47) Ptychas pis bella (C74) Solenopleura beroe (C64) 
Hyolithes daphnis (C64) Ptychaspis cacus (C64) Illenurus sp. undt. (C45) 
The stratigraphic range of the genera of the Upper Cambrian in China is 
shown by the following table. Of the 27 genera in the table all occur in the 
Cambrian of North America, with the possible exception of Chuangia. 

























: : Upper Cambrian. ‘ . Upper Cambrian. 
Gaeitead teen nen Salve iad ac ah 
Class and genus. ar 38 ‘ g | Class and genus. Ea 35 | ; f 
ce sie , 3 ae || Hea | & g : 3 a 
16) Oo ¥ 3 FI =| 0 6) g 2 Fy =| 
a 9 hal dh a oe z 
Brachiopoda: | Trilobita: | 
Obolus ra..|- eek =| Prose oe | xX x AN ENOSENSTRe ee alert ge Smeal last sheen SS lee 
DISCINODSIS:. .cdlian sea diaas e Hee et i Wien Conokephalina.|...... ar eee Wii 2a enc car 
Billingsellas..| A We... li les ra os | TORN Voces ate cl sae ccec es rere ene sheteree ke 
Boorthist.. asus ss a || eee x < Pterocephalus..|...... Mk x DS tae eae 
EL etic ll aan spain hnctet ls arom sales > SK PAP OCT deireer cael tae sr Nas Aeterna x 
SyMtLOphiawe- pas csi vee <|ee eee x xe iltes Lisahia. .qnee alee bee Ua ae RX ee 
| || Solenopleura...|...... lo ieee ere, © Ls haa x 
Gastropoda: la Chuanciaseees |) ee DG ae i xX 
Se oe ees eee Px euler PP 2s" lela || Menocephalus..|......| aaa ot, ae | ce ae 
Straparollina. =| hy aie OP eee ale Sia A ee Ptychaspis...../.... [eet |) ciel SS al ew 
Rela giella area BG \aoce 1 x x Anompcar ers 21, Milal- cove leas, Se aby Hester x< 
; ANOMOCaALC a: areca OO LOG dinaceee x 
Pteropoda: | | | ; | 
Hyolithes..... re era ee ee ee 
oe ee aaa sai ibe ech icc ae i SA eee ae all a 
Cephalopoda: | 
CYECOCETASh cle etc radeon © > Sil tore || Totalnumber..| 2 | 18 | 6 | 19 15 
| | | | 


The Upper Cambrian fauna of China is characterized by genera that are 
well developed in the same fauna in North America. The genus Ptychaspis 
is particularly prominent in species and numbers in the Upper Cambrian 
both in China and America. J//@nurus is represented by four species in the 
central portion of the Ch’au-mi-tién limestone and one at the upper horizon. 
In America it is found in the limestones referred to the Upper Cambrian 
where it has a considerable vertical range! and wide geographic distribution. 


‘Walcott, 1908e, pp. 175, 177, 192, 204, 205. 
