i322 RESEARCH IN CHINA. 
stand, however, in a form in which they are broad and faint, like Spirifer ufensis 
Tschernyschew or, especially, S. sokolovi T'schernyschew, both of which occur in the 
Schwagerina limestone of Russia. ‘The present form, however, is considerably larger 
than any of the species mentioned. 
Under this title I have associated some imperfect specimens from the same and 
other localities, much smaller in certain cases but otherwise similar, so far as can 
be made out. ‘The determination of their real relationship, however, must await 
the discovery of more complete material. 
Locality and Horizon.—Pennsylvanian (Wu-shan limestone) ; near Ta-ning-hién, 
East Ssi-ch’uan (stations 1 and 3). 
Amboccelia sp. aff. A. planiconvexa Shumard. 
Of this species our collection contains but a single specimen, a ventral valve 
somewhat distorted by compression. From umbo to front the length is 6 mm. 
The width is about 5 mm. or a little over. ‘The shape is subcircular or subquadrate 
and the sinus is faint or absent. The surface appears to be smooth and without 
the scars of spines or other ornament. On this account it has seemed necessary to 
consider this specimen an Ambocelia, instead of a young example of Squamularia. 
The generic reference is nevertheless tentative. 
This form, so far as its characters have been ascertained, is very similar to our 
common American species A. planiconvexa. ‘The only difference which is at all 
noticeable is the apparent faint development or absence of a sinus; but from a 
single somewhat crushed specimen the inference that this is a normal feature of the 
species is hardly justified. 
Locality and Horizon.—Pennsylvanian (Wu-shan limestone); Tung-kuan-k’6u, 
East Ssi-ch’uan (station 17). 
Martinia ? sp. 
This form is represented by a fragmentary dorsal valve, which probably had a 
complete length of about 15 mm. and a width of but little less. The shape seems 
to have been broadly ovate, with rather strong convexity. Two distinct but ill- 
defined radial depressions divide the surface into three portions, of which the central 
one, or fold, thus well defined, is perhaps a little broader than the two lateral ones. 
This shell might be a Composita (its exact position is undeterminable) or a 
member of several related genera, but upon the whole it appears to me rather more 
probable that it is a Martinia. As such it might belong to any one of a number 
of species, but too few characters are shown to determine definitely upon this point. 
So far as can be made out it closely resembles Athyris globularis as figured by Kayser 
from Chinese specimens. 
Locality and Horizon.—Pennsylvanian (Wu-shan limestone); near Liang-ho- 
k’6u, East Ssi-ch’uan (station 7). 
Squamularia ? aff. S. perplexa McChesney. 
This form is represented by five specimens, all from one locality. ‘hey are 
somewhat exfoliated and more or less badly crushed in the black calcareous shale 
which forms their matrix. While many details can not be made out, resemblance 
to the common American species S. perplexa McChesney is rather strong. 
The largest specimen has a length from umbo to front of about 15 mm. ‘The 
spine-scars are quite large and arranged concentrically in single rows, which are in 
some specimens rather closely placed but in others are farther apart and separated 
