DISCUSSION OF THE CAMBRIAN FAUNA. 47 
DISCUSSION OF THE CAMBRIAN FAUNA OF CHINA. 
The discussion of the fauna might be extended to include a detailed 
comparison of each species with forms resembling it from Cambrian forma- 
tions in other parts of the world, but the illustrations on the plates show the 
characters of the species so well that I will leave to each investigator the 
decision as to whether the species of the fauna he may be considering are 
similar to those of the Chinese Cambrian. In the following notes only general 
statements and conclusions are given. 
Alge.—So far as known no true Alge have been found, but fillings of 
mud cracks and annelid trails occur resembling stems of Algee; their true char- 
acter may be determined by comparison with similar recent phenomena. 
Foraminifera.—The almost total absence of Foraminifera is probably 
due to oversight connected with hurried collecting and to the absence of 
favorable conditions for the presence and preservation of specimens. The 
one species Globigerina ? mantoensts [plate 1, fig. 1] is all that has been detected 
in the relatively large collections. 
Porifera.—Only a few spicules of Protospongia are known. ‘These indi- 
cate that when a favorable locality is discovered a fine representation of the 
sponges will be found. 
Anthozoa.—One genus with one species of Coscinocyathus suggests the 
great development of the Archeocyathine in the Atlantic Basin fauna as 
found in the islands of Sardinia and Newfoundland, and the Pacific Basin 
fauna in the Cordilleran area of Nevada in western America. In Asia the 
type is known from Siberia as described by Eduard von Toll [1899]. 
Annelida.—A few trails are all the traces that have been found of the 
annelids. One of these is illustrated by plate 1, figure 5. 
Brachiopoda.—Among the brachiopods none of the genera is peculiar to 
the Chinese Cambrian. All belong to genera found in the Middle Cambrian 
of western North America and northwestern Europe. The genus Micromitra 
is well developed and I have inserted on plate 1, figure 13, a photographic 
reproduction of a specimen from the Middle Cambrian of British Columbia, 
that has the pedicle and surface spines finely preserved. 
Gastropoda.—The patelloid forms are represented by two genera, 
Scenella and Matherella, and three species, two from the Middle Cambrian 
(C18, C70) and one from the Upper Cambrian (C56); the cone-shaped forms 
by three species of the genus Helcionella, one of which, Helcionella rugosa 
chinensis [plate 5, fig. 8], has a dissepiment toward the apex, a feature also 
shown by both H. ? ? simplex [plate 5, fig. 11] and H. ? clurius [plate 5, fig. 7]. 
The coiled gastropods are of unusual interest, as three forms, Matherella? sp. 
undt. (C55) [plate 5, fig. 6], Pelagiella chronus (C1, C4, C18) [plate 5, figs. 9, 
ga-b], and P. willisi (C72) [plate 5, figs. 12, 13] are from the Middle Cambrian. 
Pteropoda.—The species of the genera Hyolithes and Orthotheca are of 
the usual Cambrian type. I have introduced on plate 6, figure 8, a reproduc- 
