PROCEEDINGS OF THE NA TIONAL MUSEUM. 



VOL. XXIX. 



expected when S3'stematie, thorough exploration and collecting- is 

 undertaken. The following is a synopsis of the fauna as now known: 



Name. 



Protozoa 



Porif era 



Brachiopoda 

 Gastropoda . . 

 Pteropoda . . . 

 Coi)halopoda 



Trilobita 



Ostracoda . . . 



Total . . 



ASSOCIATION OF GENERA AND SPECIES. 



In order that the student may be saved the labor of making lists of 

 the species from the various localities, the following lists are inserted. 

 The species given in each list do not all occur in the same layer of 

 rock, but they are from the same band of layers. The number of 

 layers and their thickness will be given in Mr. Blackwelder's report 

 on the detailed sections. The stratigraphic range is limited so as to 

 avoid the commingling of faunas from distinct fauiial zones. 



The line between the Middle and Upper Cambrian faunas is placed 

 at the top of the Ku San shale. The fauna of tlie Ku San shale includes 

 species of Dmnesella^ Dorypyge^ and genera that are typical of the 

 Middle Cambrian fauna, while the fauna of the Chao Mi Tien lime- 

 stone, above the Ku San shale, is more nearly related to that of the 

 Upper Cambrian of North America and northwestern Europe. 



The line of the Lower Cambrian is placed at the top of the Man To 

 formation, as the predominant trilobite, RedJichia, is more closely 

 related to Olenellus than to the trilobites of the Middle Cambrian 

 fauna. 



BrachioiKjda: 



CraiiifJtit t' sp. 



Oholus matmalis, 0. .sp. 



0. (Lingulella) daniesi. 



Syntrophia orientalis, S. orthia. 



Plectorthis doris, P. kaysrri, P. linnarssoni, P. 

 jMgoda. 



BiUingsclla pumpellyL 

 Gastropoda: 



Scenclla, species undetermined. 



Straparollina circe. 



Platyceras clytia, P. pagoda. 



Stenotheca, species undetermined. 

 Pteropoda: 



Hyolithcs daphnix. 



Orthotheca cyrene, O., species undetermined 

 Cephalopoda: 



Cyrtoceras cambria. 

 Trilobita: 



Agnostus chinensis. 



Anomocare bergioni, A. hhinos. 



Anomomrclla bauds, A. carnie. 



Mfnocephalus (?) depressus. 



Upper Cambrian Chao Mi Tien formation. 



