lambe. ] CANADIAN PALAEOZOIC CORALS. 41 



Corallum dendroid, composed of stems, from 5 to over 10 mm. thick, 

 that branch generally dichotomously, at varying intervals. Corallites 

 subpolygonal, at first thin walled and nearly vertical in the centre of the 

 stems, then, curving gracefully outward with gradually thickening walls, 

 they emerge at the surface, inclined slightly upward, and expand into 

 wide, shallow calyces which join each other in sharp, thin edged, poly- 

 gonal outlines. About twelve, sharply defined, longitudinal grooves pass 

 outward from the interior of the corallites over the faces of the calyces, 

 at the bottom of which they are most clearly marked. Calyces unequal 

 in size, with numerous small ones intercalated between the larger ones ; 

 width varying in the large ones from about 1*5 to slightly over 2 mm. 

 Mural pores of moderate size, irregularly distributed, not very numerous, 

 occurring in the faces of the expanded calyces as well as in the inner parts 

 of the corallites. Tabulae complete, transverse, distant. 



Devonian. — Hamilton formation ; township of Bosanquet, county of 

 Lambton, Ont., at Thedford (Widder) and Bartlett's Mills. 



Genus Trachypora, Milne-Edwards and Haime. 1851. 



(Polyp. Foss. des Terr. Pateoz., p. 305.) 



Corallum ramose, consisting of cylindrical stems composed of short coral- 

 lites diverging from an imaginary central axis in an alternating manner 

 and opening on the surface in generally four rows of oval, very slightly 

 oblique, distant calyces ; walls of corallites thickening rapidly ; mural 

 pores small ; tabulae directly transverse, few in number ; septa apparently 

 obsolete ; edges of calyces obscurely striated in a radial direction ; surface 

 between the calyces delicately sculptured by irregular, longitudinal, im- 

 pressed lines. 



Trachypora elegantula, Billings. 



Trachypora elegantula, Billings. 1860. Canadian Journal, new series, vol. V., p. 254, 



figs. 2, 3, 4. 

 Dendropora elegantula, Rominger. 187G. Geol. Sur. Mich., Foss. Corals, p. 63, pi. 



XXIII., fig. 2. 

 Trachypora elegantula, Hall. 1876. Illus. Dew Foss., pi. XXXIII., figs. 1—8. 



Nicholson. 1879. Palasoz. Tab. Corals, p. 108, pi. V., figs. 4— 4c. 



Whiteaves. 1889. Contr. to Can. Palaeon., vol. I., pt. II., p. 121. 



Corallum upright, ramose, with branches proceeding from the stems at 

 somewhat obtuse angles, and also branching dichotomously ; stems 5 mm. 

 in thickness and under, circular in section, sometimes flattened on four 

 sides so as to be almost square in section. Oval calyces, with slightly 

 raised margins, open on the surface in four or five longitudinal rows ', 

 sometimes one or two calyces occur separately between the rows. The 

 raised margin of the calyces is frequently not continued across their 



