Il8 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 75 



Genus UCEBIA Walcott 

 Ucebia Walcott, 1924, Smithsonian Misc. Coll., Vol. 75, No. 2, p. 60. 



Description. — The cranidium of Ucebia has a general resemblance 

 in outline of that of Kingstonia, but differs in important respects ; 

 it lacks a frontal limb, as the glabella extends forward to the frontal 

 rim. Another important difference is that both the dorsal and occipital 

 furrows are more clearly impressed so as to be readily determinable 

 on the exterior of the test. The suture follows about the same course 

 as in Kingstonia, passing very nearly through the genal angles. The 

 eyes are also small and hold about the same position with respect to 

 the anterior and posterior ends of the suture, but not as regards the 

 anterior extremity of the glabella. 



Genotype. — Ucebia ara Walcott. 



Range. — Upper Cambrian : Warrior limestone, central Pennsyl- 

 vania. 



UCEBIA ARA Walcott 

 Plate 17, figs. 7, 8 



Ucebia ara Walcott, 1924, Smithsonian Misc. Coll., Vol. 75, No. 2, p. 60, 

 pi. 14, fig. 4. 



The illustrations and generic comparisons give the principal charac- 

 ters of this species. 



Formation and locality. — Upper Cambrian: (107k) Warrior lime- 

 stone, two miles (3.2 km.) north of Benore Post Office, Center 

 County, Pennsylvania. 



Genus UTIA Walcott 

 Utia Walcott, 1924, Smithsonian Misc. Coll., Vol. 75, No. 2, p. 60. 



Description. — This is a very peculiar trilobite, of which only the 

 cephalon and a portion of the thorax of the type species are known. 



The cranidium is subquadrate in shape with the glabella marked 



off by a deep dorsal furrow : the latter is rectangular in outline and 



a little more than three-fourths the length of the cranidium. There 



are no apparent glabellar furrows, but the occipital furrow is strongly 



, impressed. 



Fixed cheeks as wide as the glabella: on some of the specimens 

 there is a fairly strong ocular ridge. Eyes small, and situated about 

 opposite the middle of the glabella. An unusual feature of this trilo- 

 bite consists of the peculiar depressions in the fixed cheeks which run 

 parallel to the dorsal furrow and the glabella. These depressions 

 begin just back of the ocular ridge and widen out posteriorly. The 



