NO. 22 CAMBRIAN TRILOBITES, 3D CONTRIBUTION RESSER I3 



Glyphaspis tetonensis, n. sp. 



Glyphaspis cf. perconcava Miller, Journ. Pal., vol. 10, no. i, p. 30, pi. 8, 

 fiR. 17, 1936. 



G. perconcava Poulsen probably does not belong to the genus, but 

 the Wyoming form does. Compared with the genotype, G. capclla, 

 the new species has a relatively wider and longer axis, and the pleural 

 grooves run closer to the margin. 



Middle Cambrian ; South Fork, Teton Canyon Creek, Teton Range, 

 Wyoming. 



Holotype. — Columbia Univ. no. 12609. 



HAMPTONELLA, n. gen. 



Diagnosis. — Minute trilobite. Cranidium nearly quadrate. Glabella 

 un furrowed, long, rectangular, and narrow. Brim confined to a rim. 

 Fixed cheeks rather wide. Eyes small, situated about the middle of 

 the head. 



Genotype. — Ptychoparia fitchi Walcott. 



Hamptonella fitschi (Walcott) 

 Ptychoparia ? fitchi Walcott, Amer. Journ. Sci., vol. 34, p. 197, pi. i, fig. 6, 

 1887; loth Ann. Rep. U. S. Geol. Surv., p. 650, pi. 96, fig. 5, 1891. 



Lower Cambrian, Schodack; (loc. 34) 2^ miles south of North 

 Granville, New York. 



Holotype. — U.S.N. M. no. 17455. 



HEBEDISCUS Whitehouse, 1936 



Hebediscus cobboldi, n. sp. 



Ptychoparia ? attlcborensis Cobbold, Quart. Journ. Geol. Soc. London, vol. 66, 



P- 23, pi. 3, figs. 11-13, 1910- 

 Microdiscus helena Cobbold (part), idem, pi. 3, figs. 15, 16, 1910; idem, vol. 



67, p. 298, 191 1 ; idem, vol. 76, p. 370, 1921. 

 Pagetia ? attleborcnsis Cobbold, idem, vol. 87, p. 462, pi. 38, figs. 1-5, 6?, 1931. 



It appears that the English specimens referred to the Massachusetts 

 species H. attleborensis (Shaler and Foerste) are a distinct species. 

 Evidently those from Newfoundland can be left with II. attleborcnsis, 

 at least for the present. 



H. cobboldi differs in having a narrower glabella with somewhat 

 better defined furrows, and the declivity forward of the eye line and 

 glabella is less abrupt. 



Lower Cambrian, Olenellus limestone; Comley, Shropshire, Eng- 

 land. 



Cotypes. — Sedgwick Mus. no. A 8. 



