CORALS AND BRYOZOA. 
3 
The height of different specimens varies from 15 to 90 mm.; but the 
greater proportion have a height of from 35 to 45 mm., and a diameter at 
the calix of from 25 to 30 mm. 
Formation and locality. In the shaly limestone of the Lower Helderberg 
group, near Clarksville, N. Y. 
AULOPORA, Goldfuss. 1826. 
Aulopora Schoharie. 
PLATE II, FIGS. 1-6. 
Aulopora SchoharicB, Hall. Twenty-sixth Rept. N. Y. State Mus. Nat. Hist., p. 110. 1S74. 
“ “ “ Thirty-second Rept. N. Y. State Mus. Nat. Hist., p. 142. 1S79. 
“ “ “ Report of State Geologist for 1882. Expl.pl 2, figs. 1-6. 18S3. 
Corallum consisting of elongate, tubular, thick-walled cells, gradually enlarging 
to the aperture; increasing, sometimes by one individual budding from the 
basal part of the calix and continuing in direct line; at other times there is 
a double latero-basal gemmation, the tubes growing at an angle of about 45° 
to the parent. Exterior transversely wrinkled. All the tubes after budding 
assume an erect position and cease growth. Diameter at smaller end .8 mm., 
at aperture 1.5 mm.; length from 5 to 7 mm. 
This species is much smaller than the one in the Hamilton group referred to 
A. tubceformis, Goldf. It corresponds more nearly in size to A. serpens var. minor , 
Goldf., in Petrefada Germ., p. 82, pi. 29, fig. 16, but is larger than the figure 
there given; the extremities of the tubes are more unequal, and the mode of 
growth and bifurcation differ. 
Formation and localities. In the shaly limestone of the Lower Helderberg 
group, at Schoharie and Clarksville, N. Y. 
Aulopora tubula. 
PLATE II, FIGS. 7, 8. 
Aulopora tubula, Hall. Thirty-second Rept. N. Y. State Mus. Nat. Hist., p. 142. 1S79. 
“ “ “ Report of State Geologist for 1882. Expl. pi. 2, figs. 7, 8. 1SS3. 
Corallum consisting of comparatively short, tubular, cylindrical cells, gradually 
increasing in size to the aperture ; growing in close aggregation from frequent 
