ENGONOCERATID &. Le) 
bifid; the inner arm is slightly trifid in nearly all the sutures, and this 
becomes more apparent in the older sutures. The lateral saddles are 
broadly phylliform. The second laterals are obscurely and equally bifid 
in all the sutures; the third shows a faint tendency to become bifid only im 
the older sutures; the fourth seems to have a similar tendency, but this does 
not become demonstrable, and it must be described as narrower at the base 
and entire. The fifth is bifid in the younger sutures observed, and becomes 
more distinctly bifid with age; the sixth is narrower and entire; the seventh 
is equally bifid; the eighth is also equally bifid, but the inner arm is 
unequally subdivided by a minute-marginal; the ninth is also equally bifid, 
and each arm is also bifid with a minute marginal lobe; in some sutures 
both are unequally divided and in others the outer is symmetrical, the inner 
asymmetrical; the tenth is small and entire, and the eleventh is very broad 
and is subdivided by a minute marginal lobe introduced on this volution, 
and the outer arm shows a tendency to broaden and become bifid in the 
older parts of the same. The saddles are phylliform but rather short and 
stumpy from second to sixth, then they become very broad and less phylli- 
form; the lobes have the usual narrow bases between the expanded bases of 
the saddles and spread out apicad between the phylliform saddles. These 
are all apparently unequally subdivided, and the digitations and serrations 
are somewhat more numerous in the second to the fifth laterals than in most 
other species. The first and sixth are simply trifid, the seventh and eighth 
bifid, the ninth and tenth entire. 
On the left side the first lateral saddles have a narrower outer arm, 
divided by a deeper marginal lobe, and the inner arm is not so broad and 
shows only a faint tendency to become bifid. The second lateral is more 
distinctly but unequally bifid; the third shows a faint tendency to a trifid 
undulation; the fourth is entire; the fifth is faintly bifid; the sixth is dis- 
tinctly but asymmetrically bifid; the seventh is equally and deeply bifid; 
the eighth is very broad and also deeply bifid, the outer arm has the margin 
faintly undulated into four nearly equal marginal serrations, the immer arm 
is asymmetrically bifid; the ninth is also unsymmetrically divided, the 
outer part or arm is very broad, rather rounded basally and undulated into 
three minute serrations on the margin, the inner arm is a minute saddle; 
the tenth saddle is like that of the right side, but faintly bifid im the first 
sutures seen; the eleventh saddle is narrower than on the right side and 
