142 PALEONTOLOGY OF KEW JERSEY. 



Formation and locaUty: 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, n. sp. 



Plate XVIII, 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- 



