ART. 21 OEDOVICIAN TRILOBITES ULEICH 37 



is referred to T. hipiMictatus. It is slightly wider than the others, 

 seems spineless behind, has but two axial segments, the anterior of 

 which carries two small nodes or short spines whereas the broad 

 posterior one rises apparently into a single larger spine. The third, 

 referred to T. impunctatus, is less convex, wider in front (more 

 broadly triangular), and has wider pleural lobes than the others. 

 The fourth, which is doubtfully referred to T. troedssoni, probably 

 the nearest American relative of T. mobergi, is much like the third 

 in outline, with, respectively, two and one nodes on the anterior and 

 posterior axial rings. The two slightly different pygidia found with 

 T. tellicoensis and T. hirdnus have a posterior spine and two axial 

 segments, with two small nodes on the anterior segment and one, 

 or it may be two, larger ones on the posterior one. 



OccuTvence. — Tellico formation associated with T . transversus in 

 a bed of reddish crystalline limestone 10 feet above the base of the 

 Tellico formation, one and one-half miles southeast of the Southern 

 Railway station in Knoxville, Tenn. In this belt the Tellico rests 

 unconformably on the Holston marble. In the belt next to the 

 east the Tellico still is in contact with the Holston, but the Telephus 

 zone lies about 300 feet above the base of the Tellico. In the belt 

 next to the east the Holston is commonly entirely wanting, and 

 where any beds of it are found they are succeeded by from 1,000 

 to 4,000 feet of Athens shale before the section reaches the base 

 of the Tellico. 



Cotypes.—C2.t. Nos. 80531, 80532, U.S.N.M. 



TELEPHUS TRANSVERSUS. new species 



Plate 6, Figures 20, 21 



This species is represented by a single good cranidium that was 

 found in association with numerous heads, free cheeks, and pygidia 

 of T. tellicoensis and T. hircinus in the Tellico formation east 

 of Knoxville, Tenn. Though obviously very closely related, it was 

 at once distinguished from the common associated forms by its 

 even shorter, more transverse form, the lesser convexity, greater 

 posterior width, lowly ridged contour, and flattish slopes of the 

 glabella, and the greater width of the frontal rim. As in T. telli- 

 coensis^ a very shallow, obscurely defined broad pit lies near the 

 middle of the lateral slopes of the glabella. These pits, though 

 much shallower than the corresponding impressions in T. hipunc- 

 tafiis, nevertheless, as does also the cranidium as a whole, remind 

 of that older species. However, critical comparisons indicate other 

 slight differences that help in warranting the specific distinction 

 here credited to the two forms. Thus, the broken base of the occipital 



