CEPHALOPODA OF THE CRETACEOUS MARLS. 275 
Genus BACULITES Lamarck. 
BACULITES OVATUS.’ 
Plate xLv1, Figs. 3-9. 
Baculites ovatus Say: Am. Jour. Sci., vol. 2, Ist ser., p. 41; vol. 6, Pl. v, Figs. 5 
and 6; Morton, Am. Jour. Sci., vol. 17, p. 280; vol. 18, Pl. 1, Figs. 6-8; 
Jour. Acad. Nat. Sci., Phila., 1st ser., vol. 6, p. 89, Pl. v, Fig. 6 (and 5 ?); 
Synopsis, p. 42, Pl. 1, Figs. 6-8 (the latter perhaps doubtful) ; Gabb, Synop- 
sis, p. 22; Meek, Check List (in part), p. 23; Geol. Surv. New Jersey, 1868, 
p. 730. 
The examples of this species as they occur within the State of New 
Jersey are pretty generally internal casts and usually only small detached 
fragments of a few chambers each. Occasionally one is found which will 
preserve the inner layers of shell, but even this appears to be quite rare. 
One of the examples figured by Dr. Morton, PI. rx, Fig. 1, of his Synopsis, 
is in this condition, and is the only one which I have seen preserving even 
this much of the shell. The specimens do not appear to attain a very great 
diameter, the largest observed having a diameter of not more than 14 inches 
in the longest axis. They appear to have enlarged upward very slowly 
with the increased length, but are by no means uniform in this respect, not 
even in different parts of the same individual. The exterior of the shell, so 
far as can be determined from the cast, must have been smooth except for 
a few undulations on the edges, more particularly so on the siphonal edge, 
where they are somewhat evenly arranged, at least on the younger speci- 
mens. ‘The general form of the shell in section is supposed. to be ovate, 
' The following is Say’s original description of B. ovatus, taken from Am. Jour. Sci. and Arts, Ist 
ser., vol. 2, p. 41: 
‘* Baculites ovata, elongate; transverse septa subovate, six-lobed, and a smaller one behind; lobes 
of the superior faces of the septa, three on each side, with a minute one between each, dentated at their 
edges; anterior lobe (nearest the siphuncle) small, not sinuous; second lobe with a single projection 
each side and sinus at tip; third lobe dilated, with a small sinus each side and more obtuse and pro- 
found one at tip; posterior lobe hardly larger than the lateral intermediate ones. 
‘Greatest diameter of the transverse section, one inch and one-fifth; smaller diameter, seven- 
tenths; length of the segment about half an inch.” 
The specimen used was the same as that used and figured by Dr. Morton in the Jour. Acad. Nat. 
Sci., Phila., Ist ser., vol. 6, pp. 89 and 196, Pl. v, Fig. 6, and was from the Lower Green Marls at Never- 
sink Hills, N. J ., While the B. compressa described by Say on the same page as above was from Nuttal’s 
collection, made on the Upper Missouri River. 
