DEVONIAN ROCKS OF CANADA WEST. 139 



Ctstiphtllum Ameeicantjm:. — (Edwards and Haime). 

 C. Amebicantjm. — (Edwards and Haime,) Polypiers Fossiles, p. 464, 



C. Ctlindeicum. — (Hall,) Geology of New Yor1c,-Qaxi 4, p. 209, No. 



48, fig. 1,2. 



Elongated, straight, or curved, enveloped in a tMn epitlieca ; 

 surface usually with numerous sharp and prominent folds, sometimes 

 smooth. Cup moderately deep, and in the large specimens rounded 

 in the bottom, feebly marked on the sides witli the septal furrows ; 

 internal structure uniformly vesicular, the cells near the outside 

 being from half a line to one line and a half wide, and somewhat 

 larger in the centre. Length from one to six inches ; diameter from 

 three-fourths of an inch to three inches. 



This species is exceedingly variable in form. The specimens are 

 straight, gently or abruptly curved. 



G-eniis Haimeophtllum. — (Billings.) 



Corallum aggregate, consisting of colonies of long slender sub- 

 parallel corallites, united laterally by periodical expansions of the cup. 

 Internal structure of vesicular diaphragms, as in the genus Michelinia; 

 radiating septa rudimentary. 



This genus differs from Michelinia in having no pores in the outer 

 walls ; and from Cystiphjllum in having the interior filled with cells, 

 which are most prominent in the centre of the tubes, and curve 

 downwards as they reach the margin. 



It is dedicated to the late Jules Haime, one of the authors of that 

 excellent work, Polyjplers Fossiles des Terrains PalcBoziques. 



Haimeophtllum oediitatum. — (Billings.) 



Corallum forming large sub-globular or flat hemispheric masses ; 

 average diameter of the corallites in the constricted portions one line 

 and a half to two lines, and of the expansions two and a half to three 

 and a half lines. The epitheca, where it can be seen between the 

 expansions, is more or less distinctly marked with the longitudinal 

 septal strise. There appears to be about forty internal strise. The 

 expansions which connect the corallites are periodical, or occur at the 

 same level in all the individuals at distances of from one to three, 

 lines. 



