134 PALEONTOLOGY OF NEW JERSEY. 
specimens from Burlington, where I have separated them from the matrix 
so as to get the impression of the shell as left in the fine sand, they are seen 
in a very perfect manner. The lines are exceedingly fine and threadlike, 
but regular and distinct. 
Formation and locality: As yet I have noticed the species only from the 
vicinity of Burlington, New Jersey. Mr. Gabb’s specimens were also from 
the same county. 
Genus MARGARITELLA M. & H. 
MARGARITELLA ABBOTTI. 
Plate xvu, Figs. 12-15. 
Architectonica Abbotti Gabb: Proc. Acad. Nat. Sci., Phila., 1861, p. 321. 
Margaritella Abbotti (Gabb) Meek: Check List Cret and Jur. Foss., p. 18; Geol. 
N. J., Newark, 1868, p. 728. 
Plewrotomaria crotaloides (Mort.) Gabb: Synopsis, p. 69, and Cirrhus crotaloides, 
p. 47. 
Solariella Abbottt (Gabb) Stoliczka: India Geol. Sury., Pal. Indica, Cret. Fauna 
South. India, vol. 2, p. 367. 
Shell of medium size, subdiscoid with a very low, depressed-convex 
spire and nearly flat base; volutions four or five, rather slender, coiled 
one below the other, their upper surfaces rounded, with deep suture line, 
keeled on the periphery in the cast, and very depressed convex on the lower 
side between the abrupt, moderate sized umbilicus and the outer angle ; 
margin of the umbilicus abruptly rounded and the opening less than one- 
third of the entire diameter of the shell at any given point; upper surface 
of the volutions marked by closely arranged, but distinctly marked trans- 
verse undulations, which extend from the suture outward to about one-third 
of the width of the volution, and appear to have been directed slightly 
backward in their course; surface texture of the shell composed of fine spiral 
lines and finer transverse lines; section of the volution narrow ovate, 
three-fifths as high as wide, rounded on the inner end and acute on the outer 
margin. 
The above description is taken from the Mullica Hill specimens in the 
Acad. Nat. Sci., Phila., which are partially Mr. Gabb’s types. A comparison 
