ENGONOCERATID 2. 161 
The sixth saddle on the left side is bifid; the seventh is broad and 
symmetrically and deeply bifid, looking like two entire saddles; the eighth 
has a large, slightly bifid, outer and a tongue-shaped inner arm; the tenth 
is bifid. The ninth and tenth can be reckoned in several different ways on 
account of the peculiar formation of the lobes, either as above, or the inner 
arm of the ninth be called the tenth and what is here named the tenth can 
be classed as the eleventh, or, on account of shortness of the lobes, the 
whole may be considered as a single broad saddle with three arms, the 
outer and inner arms bifid and central arm narrow and entire. The 
eleventh saddle is trifid and broad, the twelfth and thirteenth entire, and 
the last is on the line of involution. On the right side the first lateral 
saddles, on account of the asymmetry of the ventral lobe, are narrower and 
the second is much reduced. The second to the seventh are entire, the 
eighth and ninth are symmetrically bifid, the tenth to the thirteenth are 
entire. The twelfth and thirteenth saddles alone correspond or are 
symmetrical, bilateral on both sides of the body. The lobes have a ten- 
dency to become irregular at their terminations and are long and narrow 
on both sides and more alike than the saddles. 
There is also a large fragment of an example of this species in its 
gerontic stage, or of an undescribed species, associated on same mount 
with EH. subjectum (No. 10755 Collection Boston Society Natural History). 
The diameter from line of involution toward venter as far as fragment 
goes is 68 mm. There are only a few millimeters wanting externally, 
since part of the first saddle is present. There are apparently nine 
saddles only on the side, all entire except the seventh, eighth, and ninth, 
which are bifid. The first to fourth lobes are long and narrow and the 
saddles stout but phylliform. These sutures belong obviously to a very 
aged shell, since out of nine sutures visible the eighth is the first that does 
not slightly overlap and the last four overlap progressively more and more. 
The absence or very slight development of the outer lines of nodes 
and the absence of distinct ridges on the ventro-lateral edges of the venter 
distinguish this species from LH. subjectum. The sutures of these two run 
closely together, although the saddles and lobes of this form are somewhat 
stouter and broader at the same age than in EL. subjectwm. 
Locality: McPherson County, Kans. 
Age: Comanche series, Kiowa shales. 
MON XLIV—03 st 
