48 NEW YORK STATE MUSEUM 



Craniella agaricina Hall & Clarke 



Crania agaricina Hall & Clarke. Palaeontology of New York. v. 8, pt 1, p. 180, 

 pi. 4H, fig. 2 



This shell was described from the Helderberg fauna at Clarksville, N. Y. 

 It occurs also at Dalhousie. 

 Horizon. No. 9. 



Crania 



A smooth-shelled Crania occurs attached to specimens of Pterinea at 

 no. 10. 



Pholidops ovatus Hall 



Occasional at Dalhousie. 

 Horizon. Nos. 8, 9, io. 



Orbiculoidea sp. 



Plate 11, figures 13, 14 



Valves of a rather large species attaining a diameter of as much as 

 30 mm occur not infrequently together with smaller shells presumably of 

 the same species. The specific relations are not altogether certain. I 

 recognize no species to which I should care to assign them. 



Horizon. No. i i. 



Favosites hemisphaericus M.-E. 6c H. 



Favosites hemisphaericus Milne-Edwards and Hainic. Polypiers Fossiles. 



1S51. p.247 

 Favosites h e m i s p h a e ri c 11 s Lambe. op. cit. p.i 1 



This species is represented by a large majority of the specimens from 

 Dalhousie including all those with small corallites up to a diameter of 

 2 mm. They are mostly of discoid and expanded shapes but also include 

 hemispherical, conical, cylindrical and clavate colonies. In the size of the 

 corallite, the size and arrangement of the pores and specially in the abun- 

 dance of the squamulae, they fully agree with the careful description given 

 by Rominger 1 and Lambe. 



The squamulae ami incomplete septa have been observed in both 

 weathered specimens and polished sections. Rominger has observed that 

 the tubes, for a certain part of their length, are intersected by single, 

 straight diaphragms, without complication, and again, both above ami 

 below, are found divided by very irregularly interlacing compound septa, 

 and these features are extremely well developed in our specimens. 1 he 

 parts with crowded squamulae form alternating concentric zones with those 

 where the squamulae form regular, rather distant septa. In one weathered 



1 Geol. Sur. Michigan, Foss. Corals. 1S76. p. 26. 



