114 PALEONTOLOGY OF NEW JERSEY. 



The features of these casts as above described show considerable re- 

 sembhince, in these specimens, to A. abrui)ta Conrad, as known in casts from 

 Mississippi, but are not sufficiently marked to aiford a positive identifica- 

 tion. Still, with the great resemblance between them here shown, I hes- 

 itate to consider them as distinct. 



Formation and localifi/: In the brown sands of the Lower Marls from 

 near Burlington, New Jersey. 



Anchuka abrupta var. acutispiea, n. var. 

 Plate XIV, Fig. 4. 



A single imperfect sj)ecimen of an internal cast occurs in the collection 

 Acad. Nat. Sci., Phila., from New Jersey, but without more definite locality. 

 The spire is only moderately slender, the apical angle being about 35°, 

 with rather compact volutions, closely coiled, as seen in the cast, indicating 

 a rather thin shell, flattened in the direction of the spire, and have been six 

 or seven in number; the last one short, subangular in the middle, and 

 rather abruptly contracted in the lower part, and extended in a slender 

 point in front; the aperture trapezoidal and oblique; surface bearing dis- 

 tinct evidence of slender spiral lines, five of which are above the periphery 

 and an undetermined number below, but apparently of about the same size 

 and proportion as those above the center. There are also distinct, promi- 

 nent, vertical folds crossing the volutions, which are directed slightly for- 

 ward in their passage from above in crossing the volution. Twelve of these 

 folds mark the last volution as preserved on the cast, but above this they 

 are not readily determined, although they appear to be fully as numerous. 

 The last volution becomes more distinctly angular on the periphery as it 

 approaches the lip, although this latter feature is not preserved. 



The cast difi'ers in the angularity of the volutions and the shorter spire 

 from A. abrupta Conrad, as herein identified, but more particularly in the 

 fewer and stronger vertical folds and in the single carination marking the 

 last volution. This latter feature alone Avould not be reliable as a specific 

 feature, as the prominence of the angulations of this part of these shells is 

 usually very variable and they are often not very much developed until 

 quite near the lip. The other differences noted are, however, very marked, 

 and will readily distinguish it from those identified with A. ahrupta. 



