NO. 3 UPPER CAMBRIAN TRILOBITE FAUNAS — RASETTI 41 



Glaphyraspis parva (Walcott) Rasetti, 1961, p. 112, pi. 22, figs. 14-17. 

 Glaphyraspis parva (Walcott) Lochman and Hu, 1962b, p. 438, pi. 68, figs. 7-52. 



A form that occurs in the transition beds between the Crepicephalus 

 and Aphelaspis zones is referred to the species. The cranidia are some- 

 what variable both in shape and ornamentation. The glabella is typically 

 parallel-sided, but in some individuals it is slightly tapered and pro- 

 portionately shorter and wider. The depth of the glabellar furrows is 

 also variable. The ornamentation of the type material from Yellow- 

 stone National Park consists of a dense, extremely fine granulation 

 plus scattered, larger granules. Some of the individuals from Tennessee 

 match this type of ornamentation; others show granules of one size, 

 while some are almost smooth. All these features may be found in 

 specimens from a single piece of rock, hence they must be ascribed to 

 intraspecific variability. 



Occurrence. — The illustrated material is from locality cno/15, 

 Three Springs. Also collected at locality cno/14, Russell Gap. At both 

 localities it occurs below the beds yielding other species of Glaphy- 

 raspis. 



ry/j^.?.— Plesiotypes: U.S.N.M. 144550. 



GLAPHYRASPIS ORNATA (Lochman) 

 Plate 10, figure 8; plate 11, figures 13, 14 



Raaschella ornata Lochman, 1938, p. 82, pi. 18, figs. 6-10. 

 Raaschella ornata Lochman, Palmer, 1954, p. 767, pi. 98, figs. 7-9. 

 Glaphyraspis ornata (Lochman) Rasetti, 1961, p. 112. 



The species is not rare in the basal beds of the Aphelaspis zone. 

 Complete specimens in shale collected by Dr. Oder, one of which is 

 illustrated herein, show that the thorax has 8 segments. The axial rings 

 have no nodes or spines. The pleurae are flat, straight, and uniformly 

 furrowed for most of their course. Near the distal end they bend back- 

 ward and downward and possess the peculiar ridges previously ob- 

 served in the pygidium. 



Occurrence. — Author's localities cnp/14, cnq/14, cnq/15, cnq/16, 

 cnr/16, cnq/17. Also in Oder's collection No. 3 at Hurricane Hollow 

 and U.S.G.S. collection 2804 on Shields Ridge. 



Ty/)^:?.— Plesiotypes : U.S.N.M. 144551-2. 



GLAPHYRASPIS ODERI Rasetti, new species 



Plate 10, figures 18-22 



Available material. — Numerous cranidia, free cheeks, and pygidia 

 well preserved in limestone. 



Description. — Glabella of same shape as in G. ornata; glabellar 

 furrows of usual pattern but exceedingly shallow on outer surface. 



