246 



Position and Locality.— In limestone strata at top of the lower Aubrey 

 group, Aubrey Cliff, one mile northeast of White River, and at the cross- 

 ing of the gOA^ernment trail on Carrixo Creek, Arizona. 



CALAMARI.E. 



CALAMITES. 



CALAMITES CANN.T5F0RMIS. 



Long, slender, tapering reed-like stem, jointed and having a large pith. 

 Its exterior surface is finely striated, but the stride are not continuous, 

 Init are interrupted at the joints by a "break." The striae on each side 

 of said "joint break" correspond to each other. Each stria has a small 

 pinhead-like projection on it near its upper extremity. The bark which 

 was left in the cast is about 1-132 of an inch in thickness. It seemed 

 to be fibrous. The strise impressions and the grooves i)etAveen the striae 

 which were filled with the bark tissue show very distinctly, the latter 

 being ridges on the inside of the bark, the former depressions. The 

 leaves were strap-like (?) the stem is flattened and in its longer diameter, 

 three feet above the ground it exceeded five inches. At its lower end the 

 joints grow rapidly smaller and shorter, so that this end is conical, but so 

 curved as to represent a dog's tearing tooth. From these lower tapering 

 joints came out the small roots which nourished this peculiar tree and 

 which were still found imbedded in the clayey stratum by the writei'. 

 The top of the stem was not found but it most likely was cone-like. 



Habitat.— West of Cibicu Creek and one mile north of the Phoenix- 

 Fort Apache trail, Arizona. The specimen above described was found im- 

 bedded in a shaley white sandstone, underlaid with a thin stratum of clay, 

 into which the lower part of the above-mentioned tree extended. The 

 location is on the east side of the mesa to the west of the aforementioned 

 Cibicu Creek, and about 42 feet below its summit.* 



'■'The specimen here described was sent to the university at Albuquertiue, N. M., and is 

 now in the collection there. 



