394 
PALAEONTOLOGY OF NEW-YORK. 
Holopea snfocosiica (n. s.). 
Plate LIY. Fig. 1 a, b. 
Shell thin, subconical : spire sharply elevated; volutions five or more, 
somewhat flattened above, the last one ventricose below and subangu- 
late on the periphery, equal in height to all the others; aperture 
round-ovate, entire, the outer lip acute at the margin and thickened 
within : columellar lip thickened, with a slight umbilical groove or 
depression upon the outside, not perforate. 
Surface marked by fine concentric strife of growth. 
The only difference between this shell and the modern Littorina is in the greater 
thickening of the columella, and the slight depression between it and the body of 
the shell. 
Fig. 1 a. View showing the aperture, which is represented with the peristome too much 
thickened. 
Fig. 1 b. The anterior side of the same. 
Geological position and locality. In the tentaculite limestone near Auburn, Cayuga 
county. 
Molucca antiqua ( Vanuxem sp.). 
Plate LIY. Fig. 2 a, b, & 3 a, b. 
Idttorina antiqua : Vanuxem, Geol. Report of the Third District of New-York, 1843, p. 112, f. 4. 
Shell subconic - ovoid : spire elevated, obtuse; volutions about four, 
regularly rounded, the last one ventricose; aperture rotund-ovoid : 
columella slightly reflexed. 
Surface marked by fine strife corresponding to the lines of growth. 
This species occurs abundantly, in the form of casts, in the tentaculite limestone 
of Schoharie and Herkimer counties. The specimen figured as cited is smaller than 
the ordinary size of those which have fallen under my observation, and smaller than 
most of the specimens which have been marked with that name by Mr. Vanuxem. 
Fig. 2 a. A cast of this species of the ordinary size. 
Fig. 2 b. A similar cast, which is a little more ventricose. 
Fig. 3 a. A cast of a larger specimen. 
Fig. 3 b. The anterior view of a larger individual. The apparent extension of the shell on 
the lower side is a misrepresentation of the artist. 
Geological position and locality. In the tentaculite limestone : Helderberg moun¬ 
tains, Schoharie; Litchfield and Winfield, Herkimer county. 
