CLINTON SROUP. 



43 



interstitial rays whicli are less prominent ; rays crenulated ; lower surface flat, showing the 

 origin and base of the rays. 



This little fossil is easily recognized by its regular circular face and strong crenulated rays. 

 It has at first view the appearance of the cup of some species of Cyathophyllid.,i: ; but the 

 rays curve outward and downwards towards the margin, and there is no rim or border. 



Our species, though smaller, is closely allied, if not identical with the one figured by Hisin- 

 GER ; but if the figures of Goldfuss, which he cites, or those of de Blainville, be any thing 

 like correct representations of the fossil described by Linne, then the species of Hisinger and 

 our own are very distinct from that one. The rays are much more numerous and finer than in 

 ours, and the entire coral much larger, with a smaller proportional depression in the centre. 



This fossil occurs in an impure hmestone, associated with other small corals and Bryozoa, 

 and is apparently confined to a single thin layer. 



Fig. 4 a, b. The upper surface of two individuals of different size. 

 Fig. 4 c. Lateral view of same. 

 Fig. 4 d. Base of another individual. 

 Fig. 4 e. Several rays enlarged. 



Position and locality. In the lower part of the Clinton group at Ruddock's quarry near 

 Clinton village, Oneida county. {State Collection.) 



Genus CANNAPORA {nnv. gen.). 

 [Gr. xavva, canna, and *opo5, porw*.] 



Coral calcareous, massive, tubular, internally radiate or cellular ; tubes united externally at 

 regular intervals by transverse septa. 



This coral has the general aspect of Tubipora, from which it differs in the stellate and cel- 

 lular interior of the tubes. It likewise resembles Syringopora, from which it is distinguished 

 externally by the transverse septa, which are continuous, and occurring at regular intervals ; 

 and internally by the tube being stellate, or indistinctly cellular. 



421. 1. CANNAPORA JUNCIFORMIS (n. sp.). 



PL. XVIir. Fig. 1 a-f. 



Massive, hemispheric, isolated (or incrusting other bodies) ; tubes slender, parallel or di- 

 verging, united by septa crossing rectangularly to the direction of the tubes ; interior of the 

 tubes showing six or more rays forming a star, sometimes cellular without distinct rays, and 

 often entirely hollow. Increasing by the addition of lateral or interstitial cells, 18 to 20 in an 

 inch ; connecting septa, 10 in an inch. 



The species under consideration resembles Tubipora purpurea., a very common recent coral ; 

 but the tubes are smaller, and there are twice as many in the same space. 



