""6^- 1 CANADIAN PALEOZOIC CORALS. 191 



reality a Cystiphyllum and mentions its occurrence in the Niagara group 

 of Drumniond Island, Lake Huron and at Point Detour, as well as in the 

 Niagara of Kentucky, Iowa and Indiana- The specimen from Cockburn 

 Island is preserved in such a way as to show the longitudinal ribbing of 

 the surface, the form, size and direction of the cystose plates within and 

 the radial rows of denticulations on the calicular margins as a root-like 

 extension near the basal extremity ; details of structure such as these, 

 taken with the general form and manner of growth of the corallum, 

 induce the writer to believe that C, Huronense should properly be re- 

 ferred to Hall's species from the Niagara of the State of New York. 



" Rominger's description of this species is comprehensive and accur- 

 ately describes the Canadian specimen : it appears in the following 

 words— ' Conical polyp cells attached to other bodies at the base, and by 

 additional root-like prolongations from the sides. Stems elongated, sub- 

 cylindrical, or shorter turbinate, annulated by superficial constrictions 

 with tortuous flexions, or by periodical total interruptions in the growth 

 of a calyx, and the formation of a new cell from within. The calyces are 

 moderately deep, uniformly spreading from an obtusely angustated 

 bottom ; margins erect : their surface is blistered, and is radially striate 

 by spinulose crests, developed in some specimens with more distinctness 

 than in others. The surface of the polyp stems in well preserved con- 

 dition is longitudinally ribbed by septal strise, but it often happens that 

 the outer walls are destroyed, and that the stems are of rough exfoliated 

 aspect, exhibiting the concave side of the blisters composing the cell cups, 

 and the free edges of the single invaginated cups composing the stems.' " 

 (Lambe, 1899.) 



Cystiphyllum maeitimum, Billings. 

 Plate XYIII., figs. 2, 2a. 



Cystiphyllum maritimum, Billings. 186,3. Palseoz. Foss., vol. I., p 112. 



Corallum simple, turbinate, slightly curved, 7 cent, high and about 6 

 cent, broad at the top, annulated somewhat irregularly by a number of 

 constrictions and ridges of growth. Epitheca complete, showing close-set, 

 fine, transverse lines and also well marked longitudinal ribbing which is 

 accentuated in the underlying structure when the epithecal covering is 

 decorticated. Calyx shallow, about 13 mm. deep, with sides sloping 

 evenly to the centre, radiated by narrow, apparently denticulated or 

 spinulose, septal ribs of which there are seven or eight in a space of 5 

 mm. The inner structure, revealed by a transverse and a longitudinal 

 section, is dense and composed of very small convex plates whose general 

 direction is obliquely upward and outward from the centre, those at the 



