192 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 64 



Lonchocephalus pholiis (pi. 34, figs, i, la-b) from western Utah 

 is much Hke this species, and is its representative in the Cordilleran 

 region. 



Formation and locality. — Upper Cambrian : Eau Claire formation ; 

 (84) Dresbach, opposite the mouth of Black River, Winona County, 

 Minnesota. 



(82) On the bank of St. Croix River, at St. Croix Falls, Polk 

 County; (82a) 25 feet (7.6 m.) above the water level near the 

 Knapp, Stout & Co.'s building, Menomonie; (80) 0.66 miles (i.i 

 km.) southwest of the railway station, Menomonie; (134) banks 

 of Red Cedar River opposite Menomonie; also (83a) Rock Falls, 

 Dunn County; (78a and 98x) upper beds and (98) middle beds on 

 Mount Washington, near Eau Claire, Eau Claire County; and 

 (looa) Ettrick, Trempealeau County; all in Wisconsin. 



LONCHOCEPHALUS MINOR (Shumard) 



Plate 34, figs. 8, 8a-b 



Conocephalites minor Shumard, 1863, Trans. St. Louis Acad. Nat. Sci., Vol. 



2, p. 105. (Describes but does not illustrate species.) 

 Ptychoparia minor Walcott, 1884, Monogr. U. S. Geol. Surv., Vol. 8, p. 91. 



(Species referred to Ptychoparia.) 

 Not Conocephalites minor Hall, 1863, Sixteenth Ann. Rept. N. Y. State 



Cab. Nat. Hist, p. 149, pi. 8, figs. 1-4. 

 Not Conocephalites minor Hall, 1867, Trans. Albany Inst., Vol. 5, p. 132, 



pi. 3, figs. 1-4. 



Original description. — "Very small ; glabella well defined by linear 

 dorsal furrows, subcircular, much elevated above the cheeks, regu- 

 larly convex, slightly longer than wide, marked on either side with 

 two short, deep lateral furrows, which are directed obliquely back- 

 wards and reach not quite one-third the distance across; neck 

 furrow linear, distinctly but not deeply impressed, sinuate, arched 

 forward in the middle; neck segment short triangular, gently con- 

 vex, not elevated, posterior angle terminating in a delicate acicular 

 spine, which is prolonged backwards, its length unknown ; front 

 margin narrow, convex ; cheeks rounded, having very delicate ocular 

 ridges, which pass from the eyes in a short curve to reach the 

 glabella, a short distance in advance of the anterior glabellar furrow. 



" Length of head, o.io of an inch; length of glabella, 0.08. 



" The glabella of this species has the form and convexity of 

 C. (Monocephalus) globosus of Billings ; but the latter is destitute 

 of lateral furrows, and the neck segment is not triangular as in our 

 species." ^ 



Shumard, Trans. St. Louis Acad. Nat. Sci., Vol. 2, p. 105. 



