286 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL. XXXIV. 
ostia, though not by pores, and against the surrounding matrix makes 
a sharply defined if somewhat irregular boundary. 
Locality and horizon.—Allen limestone; cut on the Santa Fe Rail- 
road, 6 miles southwest of Chanute, Kansas. 
Ty pe-specimens.—Cat. No. 538468, U.S.N.M. 
STEINMANNIA BENJAMINI, new species. 
ate ReNGV eet ems 
Of this species we have but a single specimen, exposed on a frac- 
tured rock surface. It consists of spheres placed end to end and 
partially embracing, so that an elongate subcylindrical body is pro- 
duced, with more or less pronounced constrictions which mark the 
constituent segments. The theoretical spheres overlap so that usually 
the height of each chamber is only about half of the width. The 
party wall is single, formed by what was the terminal wall of the 
preceding segment. The constituent spheres vary in size between 
wide extremes and the growth of the organism as a whole is contorted 
and irregular. The length of the fragment is 55 mm. and the greatest 
diameter 10 mm. The interior of the chambers is almost empty, and 
{am not entirely satisfied that such apparent partitions as occur are 
not either adventitious or due to’chambers coordinate with the larger 
ones. Presumably each chamber communicated with those adjacent 
by means of a central osculum, but this is not shown by the fracture 
section of our specimen. The walls are perforated by numerous large 
pores, but only one size of these has been observed, though thin sec- 
tions might show others. Chambers communicate by means of these 
pores as well as by the oscula. 
One feature of the specimen should not be passed over, though it 
may be adventitious. On both sides, following their windings rather 
closely and separated from the perforate wall by a narrow interval 
filled with matrix, is a thin outer wall (?) of the same general char- 
acter as the inner one but imperforate. 
It seems probable that this form belongs to the Salt Range genus 
Steinmannia, though it shows certain differences which if real are 
important. Oscula appear to be absent, but might readily fail to be 
shown by the specimen in its present condition. The rarity or ab- 
sence of internal vesicles may be only a specific character, and can 
hardly be regarded as invalidating the generic identification. The 
most’ important difference doubtless is the apparent presence of but 
one set of perforations, and this is also the most well established. 
Aside from Steemmannia, the genus which the present form most re- 
sembles is Sollasia, and from Sollasia it differs importantly in the 
absence of ostia and the presence of perforations. If not a Steznman- 
nia the present form is, therefore, probably a new genus, but I would 
certainly regard it as inadvisable to introduce a new generic term 
under present circumstances. 
