(JASTEKOPODA OP THE LOWER GREEN MARLS, 93 



marked by numerous vertical folds, with slightly concave spaces between; 

 the folds are narrow and distinct, and very slightly bent backward in the 

 middle of their length in their passage across the volution, but not inter- 

 rupted perceptibly at the line separating the band from the body of the 

 volution, and become obsolete on the rostrated part of the last one. Be- 

 sides the vertical folds, the entire shell is marked by sharp, closely arranged 

 spiral lines, which are finer and more numerous on the upper part, be- 

 coming more distant and stronger below, especially on the lower part of 

 the last volution, where they seem to have alternated with finer interme- 

 diate striae. This latter feature may be only apparent, however, as the 

 condition of the specimens is not such as entirely to establish this feature 

 as a character of the shell. The crossing of the vertical folds by the spiral 

 striae in the upper volutions produces a very decided and beautifully can- 

 cellated structure. 



It is barely possible that this shell may not properly belong to the 

 MitridcB, but in the condition of the only fairly preserved specimen it is not 

 possible to develop the features of the columella perfectly, as this por- 

 tion has been mutilated by a stroke of a tool in digging the marl, but on 

 separating the body volution from the matrix, -the columella became par- 

 tially exposed, but no ridges appear to exist. The general form of the 

 shell would also remind one of the internal casts of the genus Volutoderma, 

 of which we know but little of the external features; but the absence of 

 columellar ridges would also be an objection here, and the features are 

 more those of Mitrce than of Valuta or Fusiis. It is possible that owing to 

 the peculiar condition of preservation the substance of the ridges may have 

 been destroyed, although once existing. 



Formation and locality: In the lower, coarse green marls of the Creta- 

 ceous, at Freehold, New Jersey. Among collections made by the late Rev. 

 Dr. Reiley. 



TUKRICULA LEDA, n. Sp. 



Plate XI, Fig. 7. 



Shell fusiform, with a moderately elevated and turreted spire, the apical 

 angle of which is somewhat less that 30° ; volutions five or six in number, 



