166: PSEUDOCERATITES OF THE CRETACEOUS. 
The ventral lobe is slightly asymmetrical to the left, giving rise to 
cousiderable differences in the first lateral saddles on either side. The first 
lateral on the right is bifid, the outer arm very broad and bifid, the inner 
subdivided asymmetrically by a very minute marginal lobe. Beyond this 
the inner arm is entire and quite large and phylliform. There are ten 
saddles and nine lobes on this side All the former are entire except the 
innermost, which is slightly bifid. The lobes vary from trifid to six-pointed. 
On the left side the first lateral saddles have the usual bifid form without 
further subdivisions. All the saddles appear to have entire phylliform out- 
lines, but this may be due to the worn sutures. The first to fourth lobes 
are slightly digitated, the fifth is faintly trifid, and beyond they are too 
much worn to show the minute serrations. 
On the left side the first lateral saddles have the usual bifid form, the 
outer arm broad, pointed externally, and with only a slight indentation on 
the margin. The second to seventh lateral saddles are entire and phylli- 
form; the eighth is broad and deeply bifid, but is apparently only one 
saddle; the ninth and tenth are entire. 
The first to fourth lobes are faintly denticulated, the fifth and sixth 
narrow and trifid. The seventh is totally unlike any other lobe. It seems 
to be filed by a pointed saddle, the end bifid in one case. 
There is also another specimen from the same locality, a cast with a 
part of a living chamber preserved. ‘This is about one-half of a volution 
and in the gerontic stage, the last five sutures overlapping. The preceding 
sixth or eighth, being in the ephebic stage, do not overlap. The lobes and 
saddles are like those of the fragment just described, the sixth to the eighth 
saddle on the right side being bifid and the ninth entire. The saddles in 
old age, however, are flatter and the lobes become shorter. 
The ornaments are the same as in other specimens, but the venter 
becomes broader in proportion to age; tubercles persistent. The living 
chamber is obviously nearly complete and must have been at least one-half 
of a volution in length. 
Three small fragments from locality No. 1554, Seven Knobs, near 
Glenrose, Tex., have tubercles larger and more prominent, and although 
the sutures vary they are near enough to belong to the same species. 
The largest specimen over one-half of a volution is 52 mm. in diameter. 
Probably, allowing for compression, this diameter is only 45 mm. The 
