REPORT ON UPPER PALEOZOIC FOSSILS FROM CHINA. 323 
by bands of fine concentric striz, four or five strie in each band. This may prove 
a specific or varietal difference among the specimens themselves, which, however, 
it did not seem wise to enforce here, and it may also constitute a practicable dis- 
tinction from the American species, in which a similar character is seldom observed. 
Like the latter, the form under consideration appears to be without septa or dental 
plates. So far as my observation extends these structures are absent in this group 
in all species of Upper Carboniferous or Pennsylvanian age, and present in all those 
which occur in older rocks. ‘This fact appears to me to satisfactorily validate these 
two divisions as being, if not of generic, at least of subgeneric value, and since 
McCoy’s term Keticularia was associated with the septate group, though latterly 
extended to designate both, I have already proposed to restrict it to the original 
content. For the nonseptate group I have provisionally employed Gemmellaro’s 
term Squamularia, which some European authors, who appear to have examined 
characteristic examples of that genus, regard as asynonym of Reticularia. Squamu- 
laria is unprovided with internal septa, however, and can not, therefore, be the same 
as Reticularia s. str., and as it is said to be ornamented with continuous projecting 
lamelle instead of fimbriz of spines, bearing about the same relation to the nonsep- 
tate Reticularie that among athyroids Athyris does to Cleiothyridina, it seems a 
little doubtful to me whether precisely the same term should be employed for both. 
Locality and Horizon.—Pennsylvanian ; near Yen-chuang, Shan-tung (station 69). 
Cleiothyridina ? sp. 
Two specimens, each from a different locality, represent this group. They 
possess a general resemblance, but it is far from certain that they belong to the 
same species. 
A specimen from station 69 is transversely ovate, with a length of to mm. and 
a width of about 12 mm. It is probably imperfect, but the shape appears to have 
been about as described. The beak is small, pointed, and moderately elevated and 
incurved. ‘The expression of this little shell is distinctly athyroid, and though the 
surface characters are unknown, it seems probable that it is a Cleiothyridina. 
The other specimen, which was obtained from station 17 and appears to be a 
dorsal valve, has a length of 7 mm. and a width slightly greater. It is compressed 
entirely flat, and the shape is subcircular, the beak being inconspicuous. The sur- 
face characters have been lost. A fibrous shell structure gives the semblance of 
very fine striation, in addition to which delicate concentric lines can be made out. 
This specimen has somewhat the appearance of an Orthis, a resemblance enhanced 
by the finely striated surface, but its real affinities are probably very different. 
It is not deemed advisable to attempt to determine the specific relations of 
these specimens from material at hand. 
Locality and Horizon.—Pennsylvanian (Wu-shan limestone); ‘Tung-kuan-k’6u, 
East Ssi-ch’uan (station 17). Pennsylvanian; near Yen-chuang, Shan-tung (sta- 
tion 69). 
Dielasma ? sp. 
This is an internal cast of a small ventral valve which is about twice as long 
as wide and has a length of only 3 mm. ‘The general shape is subelliptical. ‘Iwo 
strong dental plates are shown. ‘There can be little doubt that this shell is a tere- 
bratuloid, the only other type possessing claims of consideration being Composita. 
So far as I have been able to ascertain, that genus, which is so abundant in American 
Carboniferous faunas, is exceedingly rare elsewhere, and would hardly be expected 
to appear in the present geographic and faunal relations. Furthermore, young 
Composite are usually nearly circular in outline and would hardly have the dental 
