ART. 21 ORDOVICIAN TEILOBITES — ULEICH 35 



As said, T. prattensis suggests relations to the Tellico species T. 

 hircmus, T. fellicoensis, and T. transversus, in all of which the gla- 

 bellar pits tend to partial or complete obsolescence and the anterior 

 rim is relatively wide. However, on further and more critical com- 

 parison it differs from all of them in being smaller and in having 

 much smaller fixed cheeks ; and from the first in the greatly inferior 

 development of the anterior and occipital spines; from the second 

 in its relatively longer cranidium and glabella and anteriorly nar- 

 rower and outwardly more rounded (less triangular) fixed cheeks; 

 and from the third in its longer cranidium and glabella, more con- 

 vex glabella, smaller anterior spines, and smaller as well as more 

 definitely ridged and differently outlined cheeks. The anterior edge 

 also seems to be more arched in anterior view and is decidedly more 

 rounded in outline in dorsal views. 



None of the other species is as near in cranidial characters as those 

 mentioned in the above comparisons nor close enough to require fur- 

 ther comment. A possible exception would be T. mysticensis^ in 

 which the fixed cheeks are still narrower, especially anteriorly, and 

 the cranidium as a whole relatively longer and more rounded in 

 outline anteriorly. 



Occurrence. — Found with T. hipunctatus in a thin bed of subcrys- 

 talline limestone regarded as representing the Whitesburg limestone. 

 This bed lies between the base of shaly and argillaceous graptolite 

 bearing limestones referred to the Athens shale and the top of mas- 

 sive beds of Lenoir limestone at Pratts Ferry, Ala. Other speci- 

 mens from the lower 50 feet of the Whitesburg limestone, about 1.5 

 miles southeast of Whitesburg and 2 miles southwest of Bulls Gap, 

 Tenn. 



Gotypes.—C2it Nos. 80541, 80542, U.S.N.M. 



TELEPHUS TELLICOENSIS, new species 



Plate 6, Figures 10-19; Plate 7, Figures 10, 11 



The available material of this species affords the nearest approach 

 to a conception of the complete carapace of Telephus. The speci- 

 mens occur in a hard matrix tenaciously adhering to the test. Out 

 of over 50 cranidia about half were prepared for study and found 

 to conform strictly to type. The rock contained also many free 

 cheeks, fewer pygidia, and yet fewer and generally broken thoracic 

 segments. 



The cranidium agrees in general and especially in the outline of 

 the glabella and surface markings with T. hipunctatus but lacks 

 entirely the pits and other markings indicating glabellar furrows. 

 Further comparisons show among other differences that the occipital 

 spine is much larger, the fixed cheeks somewhat narrower and their 



