THE LARGER FAUNAL HORIZONS. 51 
India [Reed, 1910, p. 66], taken with the occurrence of fragments of the 
fauna in Siberia in the valleys of the Lena, Yenisei, and Angara [von Toll, 
1899], indicates something of the extent of the Middle Cambrian sea. The 
larger area outlined by Willis in which Cambrian rocks are supposed to occur 
is probably much too small, as later rocks undoubtedly conceal large areas 
of the Cambrian. 
The prevalence of limestones with interbedded calcareous and argilla- 
ceous shales indicates relatively shallow seas and favorable environment for 
the life of the sea. ‘This inference is supported by the number of genera and 
species already found in the hurried collecting necessitated by the conditions 
of exploration met with by the Willis and Iddings parties. 
In the Ch’ang-hia District the Middle Cambrian is represented in 
the Ch’ang-hia limestone, in the Sin-t’ai district by the lower portion of 
the Kiu-lung limestone, and in Shan-si by the lower 4oo feet (118 m.) of the 
Ki-chéu limestone. 
The lower portion of the Kiu-lung group lower limestone contains the 
following fauna: 
Globigerina ? mantoensis (C5) Inouyia capax (C70) 
Coscinocyathus elvira (C75) Inouyia divi (C5) 
Micromitra (Paterina) labradorica orientalis (C9) Inouyia melie (C70, C75) 
Micromitra (I phidella) pannula ophirensis (C5) Inouyia thisbe (C28) 
Obolus damesi (C7) Inouyia titiana (C7) 
Obolus obscurus (C63, C75) Agraulos abrota (C23) 
Lingulella (Lingulepis) eros (C7) Agraulos dirce (C52) 
Eoorthis agreste (C28) Agraulos dolon (C7) 
Eoorthis kichouensis (C75) Agraulos nitida (C75) 
Acrotreta pacifica (C5) Agraulos uta (C75) 
Acrothele rara (C23) Agraulos vicina (C70) 
Orthotheca daulis (C23) Anomocare latelimbatum (C52) 
Scenella ? dilatatus (C70) Anomocare minus (CQ) 
Helcionella ? ? simplex (C70) Anomocare sp. (C5) 
Redlichia finalis (C58) Anomocare sp. undt. (C8) 
Ptychoparia impar var. (C8) Anomocarella butes (C5, C52) 
Ptychoparia lilia (C75) Anomocarella subrugosa (C7) 
Ptychoparia tolus (C52) Anomocarella tatian (C23) 
Ptychoparia sp. (C58) Anomocarella tenes (C28) 
Ptychoparia (Emmrichella) eriopia (C23) Anomocarella thraso (C7) 
Ptychoparia (Emmrichella) theano (C23) Anomocarella toxeus (C28) 
Conokephalina maia (C70) Coosia decelus (CQ) 
Conokephalina sp. (C70) Dolichometopus ? sp. (C5) 
Inouyia abaris (C7, Cg) Bathyuriscus ? sp. (C28) 
Inouyia armata (C75) 
Of the above fauna only three species pass into the strata above. One 
is Obolus damesi, which occurs a little higher in the limestone beneath the 
horizon of the Ku-shan shale, and it has a possible representative in the upper 
part of the Upper Cambrian. IJnouyia melie Walcott and J. divi Walcott 
are found in the strata a little higher in the section. 
