BIBLIOGRAPHY. 26$ 



Eyes large, less elevated than the glabella, and not extending back to the line 

 of the occipital furrow; composed of numerous rows of vertical lenses with hexagonal 

 outline. Surface of glabella coarsely and strongly pustulose. 



Thorax not observed. 



A few fragmentary pygidia occur in the upper beds which are doubtfully referred to 

 this species. They are semi-circular in outline, moderately convex, with axial lobe 

 elevated and marked with 7 or 8 annulations. Pleural lobes with from 5 to 6 coarse 

 ribs. 



Remarks — This species occurs more abundantly in the upper than in the lower 

 beds, and is represented by numerous cephala, and by a few exfoliated pygidia. The 

 characteristic stout spines of the genal angles have not been observed in the specimens 

 examined. Their absence is probably due to the condition of preservation. 



Horizon — Lower and upper beds. 



Figured specimens Nos. 27541 and 27532, Walker Museum. 



Phacops sp. 

 Plate 71, figure 26 



Description — Pygidium small, semi-circular in outline. The dimensions are: 

 Length 8 mm., width 13 mm. Axis prominent, narrow and tapering, with 7 rounded 

 annulations, the two posterior ones indistinct; intermediate depressions shallow. Pleural 

 lobes with 6 rounded segments also separated by shallow grooves. 



Horizon — Upper beds. * 



Figured specimen No. 27533, Walker Museum. 



BIBLIOGRAPHY BY E. B. BRANSON. 



The titles of books and articles that bear directly on the 

 Devonian of Missouri are included in this bibliography. The 

 literature having to do with the fossils is listed in the synonomy 

 to the various species. 



Branson. E. B. 



The Devonian fishes of Missouri. Univ. of Mo. Bull., vol. 15, number 31 



(Sci. series, vol. 2, number 4) pp. 59-74, 1914. 

 A four-mile section along the Missouri River south of Columbia, Mo. 



Abstract. Science, new series, vol. 37, p. 459, 1913. 

 Devonian of central Missouri. Abstract. Bull. Geol. Soe. Am. vol. 26, 



number 1, pp. 112-ff. 1915. 

 Geology of Missouri: Mo. Univ. Bull., vol. 19, No. 15, 172 pp., 59 figs., 



May, 1918. 

 A geologic section from 40 miles west of St. Louis to Jackson County, 



Missouri. Am. Jour. Sci., vol. 49, pp. 267-278, Apr., 1920. 

 Branson, E. B. and Greger, D. K. 



Devonian of central Missouri (abstract): Geol. Soc. America, Bull., 



vol. 26, No. 1, p. 112, 1915. 

 Broadhead, G. C. 



Geological report on the country adjacent to the Pacific Railroad, from 



Sedalia to Kansas City: Geol. Survey Missouri, pt. 2 (p. 158), 



1873. 

 Warren County: Geol. Survey Missouri, Report, 1855-71, pp. 37-64, 

 (46-48), 1873. 

 Geol. Survey Missouri: 1873-1874 (pp. 27 and 324), 1874. 



