306 RESEARCH IN CHINA. 
The foregoing partial description is based altogether upon the external appear- 
ance of the specimen. ‘The fragment is so small and the preservation of minute 
structure at this horizon so imperfect that it did not seem advisable to make thin 
sections. ‘The internal structure therefore remains unknown, and while the general 
appearance suggests a member of the genus T@ntodictya, it is quite possible that this 
will not prove its true position. 
Locality and Horizon.—Pre-Pennsylvanian (?); near Ta-miau-ssi, East Ssi- 
ch’uan (station 8). 
Fenestella sp. (a). 
This type is represented by two specimens, only one of which retains sufficient 
character to furnish data for a description, and upon it the following partial account 
is based. Only a portion of the frond is preserved, and the non-celliferous face is 
shown. 
The growth is regular, the branches are nearly parallel, and the introduction 
of new ones takes place at long intervals. In a longitudinal direction about six 
fenestrules occur in a distance of 5 mm., while transversely there are nine or ten. 
The fenestrules are subquadrate, from one and a half to two times as long as wide. 
The branches are about two-thirds as wide as the fenestrules, and the dissepiments 
are essentially the same size as the branches. The surface is marked by fine, some- 
what crowded, rounded, wavy, probably inosculating lire. 
Characters of the celliferous face not ascertained. 
Locality and Horizon.—Pre-Pennsylvanian (?); near Ta-miau-ssi, East Ssi- 
ch’uan (station 9). 
Fenestella sp. (6). 
A single specimen represents this type, but it is too ill preserved to be described 
or to serve satisfactorily for comparisons, and it has been discriminated from the 
foregoing chiefly because the mesh appears to be somewhat finer. 
Locality and Horizon.—Pre-Pennsylvanian (?); near Ta-miau-ssi, East Ssi- 
ch’uan_ (station 9). 
Dalmanella ? sp. 
Plate 29, Figures 3, 4. 
This is a very small species, and, because of the hard, siliceous character of the 
closely adhering matrix, one rather difficult to study, in spite of its relative abun- 
dance. No specimen in the collection which can be referred here has a length of 
over 6 mm., which appears to be about the maximum reached in this dimension. 
The transverse diameter is usually a little greater. 
The ventral valve is rather strongly convex. In a longitudinal direction the 
curvature is regular, but transversely considered the greatest flexure occurs medially, 
so that often a sort of angulation takes place down the center of the shell, the sides 
being gently convex. The beak is strongly incurved, but projects considerably 
beyond the well-marked cardinal slopes. The general outline is therefore often 
somewhat shield-shaped, sometimes subcircular. 
The surface is marked by fine, rounded, very distinct radiating lire, of which, 
in a specimen 5 mm. long, there are thirty-four, and this seems to represent about 
the average, though doubtless more or less variation exists in this particular, appar- 
ently in the direction of greater fineness. The lira increase by bifurcation, and 
certain of them are often irregularly larger than the others. 
