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 n. FIGS. 1-8. 



Aulopora Schoharite, Ham,. Twenty-sixth Rept. N. Y. State Mas. Nat. Hist., p. 110. 1874. 

 " •• " Thii-ty-second Rept. N. Y. State Miis. Nat. Hist., p. 142. 1879. 



Rei)oi-t of State Genloj,'ist for 1882. Expl. pi. 2, fig-s. 1-6. 18S3. 



CoRALLCM 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. tubaformis, Goldf. It corresponds more nearly in size to A. serpens var. minor, 

 Goldf., in Petrefacta 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 tobula. 



PLATE n, FIGS. 7, 8. 



Anlopora tvhula. Hail. Thirty-second Rept. N. Y. State Mns. Nat. Hist., p. 142. 1879. 

 " " " Report of SUte Geologist for 1882. Expl. pi. 2, fiffs. 7, 8. 1883. 



CoRALLDM consisting of comparatively short, tubular, cylindrical cells, gradually 

 increasing in size to the aperture ; growing in close aggregation from frequent 



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