64 LOWER PENINSULA. 



with the former species in the Hamilton group of Thunder Bay 

 River, near Broadwell's mills. 



Plate XXIV., Fig. i. — The two larger stems on the upper rock- 

 piece are representations of this form in natural size. 



In the upper right-hand corner of the same piece a small, flat, basal 

 expansion and a stem of another smaller species of Dendropora are 

 represented. The tubes of these are arranged in distant, irregularly 

 quincuncial order ; the interstitial surface exhibits the same orna- 

 mentations by rugae as Dendropora elegantula, but the species is, 

 on the whole, smaller, and the arrangement of the tubes is different. 



The material at my command is not sufficient to enable me to 

 give full characteristics of the latter kind, but I think it is specifi- 

 cally a distinct form. 



DENDROPORA PROBOSCIDALIS, N. Sp. 



Small reticulated branchlets, not much over one millimeter in 

 diameter. Orifices forming proboscidal, spoon-like projections, 

 disposed in five or six longitudinal alternating rows on the circum- 

 ference of the stems, or of more irregularly dispersed position. 

 Interstitial surface longitudinally rugose, and dotted by punctiform 

 and fissure-like porosities. Diameter of orifices about one third of 

 a millimeter. Occurs with the former at Broadwell's mills ; rarely 

 also at Partridge Point, Thunder Bay, in the highest beds of the 

 formation. / ^„ 



Plate XXIV., Fig. 4. — The wpp » r group of stems, oncopt the 

 trrn nn *^^" ^""^f ^-'^^ gives a magnified view of the branchlets. 

 Enlargement two diameters. 



DENDROPORA (?) RETICULATA, N. Sr. 



With doubt I arranged, under the genus Dcndropora,the coral of 

 which a description follows : Reticulated horizontal expansions of 

 small cylindrical stems about two millimeters in diameter, composed 

 of moderately thick-walled conical tubules, the outlines of which in 

 their longitudinal extension can be distinctly seen. Orifices erect, 

 circular, with free margins. Stems similar to Aulopora spicata (;f 



