142 PALEONTOLOGY OF NEW JERSEY. 
Formation and locality: In the blackish layers of the Lower Green 
Marls at Crosswicks Creek, New Jersey. In the collections at Rutgers Col- 
lege. Collected by Dr. N. L. Britton. 
TURRITELLID. 
Genus TURRITELLA Lamarck. 
TURRITELLA COMPACTA, 0. Sp. 
Plate xvi, Fig. 8, 9. 
Shell small, with very short, slender, and closely coiled but rapidly enlarg- 
ing whorls, giving a rapidly increasing diameter to the shell with increased 
growth. Apical angle about 15°. Volutions about eight in number in a 
specimen which has been not more than seven-eighths of an inch in its 
extreme length; flattened convex on their outer surface, and subangular at 
the upper and lower margins, with a nearly flat base. Lower margin of 
the volution proportionally larger than the upper. Suture lines between 
the whorls narrow, but very distinctly marked. No surface markings 
visible. 
The above description is taken entirely from internal casts, which are 
remarkable for their compact form and close volutions of a somewhat quad- 
rangular form in the largest individual, but more rounded in others, indi- 
cating, probably, a more thickened shell. None of the external features of 
the shell have been transmitted to the cast; but its compact volutions will 
readily distinguish it from any other form in the New Jersey beds. A single 
very much crushed and distorted specimen from Haddonfield, New Jersey, 
in the collection of the Acad. Nat. Sci., Phila., retains a fragment of shell on 
one of the upper volutions showing sharply raised spiral lines to the num- 
ber of six, with a finer intermediate line, and very fine transverse lines of 
growth. Otherwise the cast presents the same form and features as those 
described above. 
Formation and locality: In marl with quartz pebbles. The specimens are 
associated in the tray with examples of T. encrinoides Morton, and are marked 
as coming from Vincentown, New Jersey, and collected by Col. T. M. Bryan. 
T. encrinoides is from the Lower Marl Beds only, so far as known, and it is 
