182 PSEUDOCERATITES OF THE CRETACEOUS. 
was shown by the accurate fitting of the ostrean shells into the irregularities 
of the broken and worn surface. A few other lower valves were removed 
to study the sutures, but in no case could | find any remnants of the shell 
of Engonoceras between the bases of attachment of the lower valves of the 
ostrean and the surface of the cast. The specimens still left upon the cast 
show these facts also. The smaller specimen was much smoother and clean. 
A much-distorted fragment from another locality, 9 miles from Austin 
on Beecaves road, of what seemed to be the gerontic stage of this species 
is 85 mm. from line of involution to venter and this is very near to the 
actual diameter in a perfect cast. The greatest transverse diameter is 35 
mm. and is somewhat greater than in a perfect cast of the same age. This 
specimen, however, has the sutures well shown on the right side, and the 
differences, with one exception given below, when compared with the first 
specimen described, can be accounted for as probably due to greater age. 
The saddles and lobes are all much nearer together, the overlapping begin- 
ning between the third saddle and second lobe. The curvature was the 
same as in the smaller specimen. 
The tenth saddle is the first bifid one and the remainder are bifid and 
near the umbilicus become very broad. 
This difference can not be accounted for by supposing that the seventh 
and eighth saddles have become completely divided by the advance in 
development of the marginal lobes, thus adding two saddles to the series, 
but indicates some original variation in this shell. 
The ventral lobe could not be defined and the condition of the other 
lobes only enabled an observer to see that they were digitated and near the 
umbilicus they were too much worn to say even this much. The length- 
ening out of the saddles by growth does not decrease the phylhform aspect 
of the bases and the lobes become narrower and longer without apparently 
altering much in general outline. 
Locality: Twelve miles northeast of Decatur, Tex. 
Age: Fredericksburg group, Comanche series, Lower Cretaceous. 
METENGONOCERAS INSCRIPTUM var.? 
This is a fragment of a volution of a large specimen, showing only a 
part of one side. It is, however, interesting, for the characteristics of the 
lobes and saddles given on Pl. XXV, fig. 8, show variations iu the forms of 
these. A specimen from west of Walnut Springs, Tex., kindly loaned me 
