GASTEROPODA OP THE LOWER GREEN MARLS. 143 



very evident there is an error from mixture of specimens in the tray, making' 

 the locaHty somewhat doubtful, as Vincentown would probably be at the 

 base of the Upper Marls. The Haddonfield example is from the very base 

 of the Lower Marls, and its position unquestioned. 



TUREITELLA ENCEINOIDES. 



Plate xviii. Figs. 19-32. 



Turritella encrinoides Morton: Synopsis, p. 47, PI. in, Fig. 7; Gabb, Synopsis, p. 

 90; Meek, Check List Cret. and Jur. Foss., p. 18; Geol. N. J., Newark, 1868, 

 p. 729. 



Shell much elongated and rather slender, apical angle in uncompressed 

 specimens from 15° to 20°; volutions compact, numbering seven in a speci- 

 men which measures If inches in length, flattened or only slightly convex 

 on their siu-faces, with narrow suture lines in the cast and sharply angular 

 basal angle, but on fragments which preserve the shell in part at least, they 

 are slightly depressed. The surface is marked by numerous spiral lines 

 which vary much in size and strength, there being two principal ones, one 

 near the upper and the other near the lower edge of the volution, with an 

 indefinite number of smaller ones; aperture, as indicated by the form of 

 the cast, subquadrangular, nearly straight on the outer margin and angular 

 above and below. 



The species differs quite strongly from T. vertebroides in the form of 

 the volutions and the less distinctly marked sutures, and in the greater 

 number of spiral lines. One of the fragments used in this description and 

 figured on our plate appears to be that used by Dr. Morton and figured by 

 him. It retains the shell to some extent, but is very imperfect. Among 

 collections obtained from the State survey are many internal casts which 

 show the volutions to be more compact than in T. vertebroides, and very 

 much more angular, with close sutures and sharp upper and lower angles. 



Formation and locality : Dr. Morton's specimen is marked "Cretaceous, 

 N. J." Under his notice of it in the Synopsis, p. 47, he says it occurs with 

 T. vertebroides, and although he gives it a name, gives no description or 

 locality except "New Jersey and Alabama." Other specimens in the State 

 collection are marked "Vincentown, N. J.," and are from collections made 



