1^8 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 64 



Formation and locality. — Middle Cambrian: (Sgx) Conasauga 

 formation. In argillaceous shale and on and in siliceous nodules 

 imbedded in the shale, Livingston, Coosa Valley, Floyd County, 

 Georgia. 



Also from (go) Conasauga shales; on Edwards farm, near Craigs 

 Mountain, about 10 miles (16.1 km.) southeast of Center; (gox) 

 about 5 miles (8 km.) east of Center; (112) shales in which siliceous 

 nodules of gox are imbedded; (i6d) shales one mile (1.6 km.) east 

 of Moshat and 5 miles (8 km.) east-southeast of Center on southeast 

 bank of a small brook; and (gs) shales on Cowan Creek, 0.5 mile 

 (0.8 km.) above Center road ford, all in Coosa Valley, Cherokee 

 County, Alabama. 



ACROCEPHALITES AORIS, new species 

 Plate 26, figs. 3, 3a-b 



The cranidium of this species is much like that of A. tutus (pi. 24, 

 figs. 6, 6a). It dififers in having narrower fixed cheeks; wider and 

 stronger frontal border. The outer surface is finely tuberculated 

 with minute depressions between them that indicate that the test is 

 probably punctate. The form of the glabella is similar to that of 

 A. amcricanus (pi. 24, figs. 2, 2a), but other parts of the cranidium 

 are quite different. 



Formation and locality. — Middle Cambrian: (loyd) Limestone; 

 I mile (1.6 km.) north of Henrietta, Blair County, Pennsylvania. 



ACROCEPHALITES ? ASTER, new species 

 Plate 26, figs. 9, ga-c 



This is a very distinct species. The narrow median swelling on 

 the frontal limb is much like that of Acrocephalites stenometopus 

 (pi. 24, fig. i), and unlike the boss on other species referred to the 

 genus. 



The occipital spine is broken off the specimen represented by figure 

 gb, but it is finely shown as a cast in the shale matrix, where it has 

 been removed by solution. 



Formation and locality. — Upper Cambrian: (358e) Conasauga 

 formation; buff-colored shales near street car barns, Birmingham 

 City, Alabama ; ( 107c) Maryville limestone, west base of Copper 

 Ridge, II miles (17.7 km.) northwest of Knoxville, Knox County; 

 and (15) Nolichucky shale, on Buckingham Ford road, 1.5 miles 

 (2.4 km.) south of Greeneville, Greene County, both in Tennessee. 



