266 THE DEVONIAN OF MISSOURI. 



from the Becraft Mountain Oriskany, New York, State, and may be compared with that 

 species. In contrast it has a greater number of axial annulations, and lacks the character- 

 istic surface ornamentation of that species. 



Horizon — Lower beds. 



Figured specimen No. 27538, Walker Museum. 



Dalmanites micrurus ? (Green) 



Plate 71, figure 22 



1832. Asaphus micrurus Green, Monograph, Trilobites, N. Amer., p. 56, fig. 3. 

 1859. Dalmania micrurus Hall, Nat. Hist. N. Y. Pal., vol. 3, p. 359, pi. 74, figs. 13-20. 

 1908. Dalmanites micrurus Clarke, Mem. N. Y. State Mus., vol. 9, pt. 1, p. 120, pi. 9, 



figs. 1-3. 

 1913. Dalmanites micrurus Ohern, Geol. Surv., Md. Low. Dev., p. 507, pi. 91, figs. 

 10-11. 



Description — A few incomplete cephala exhibit certain definite characters of this 

 species. Frontal lobe large, showing transverse subrhombohedral outline, three pairs 

 of lateral lobes sharply defined; eyes prominent, large; cheeks separated from glabella 

 by deep, strongly marked dorsal furrows. Entire surface finely pustulose. Because of 

 the abssnce of the frontal border which is a feature of the species, one cannot be reas- 

 onably sure of the correctness of the identification, but the general shape, and complete 

 separation of the lateral lobes together with the pustulose surface strongly suggest D. 

 micrurus. 



Horizon — Upper beds. 



Figured specimen No. 27542, Walker Museum. 



Dalmanites cf. pleuroptyx (Green) 



Plate 71, figure 16 



1832. Asaphus pleuroptyx Green, Mon. of Trilobites of North Amer., p. 55. 



1888. Dalmanites (Hausmania) pleuroptyx Hall and Clarke, Nat. Hist. N. Y. Pal., 



vol. 7, p. 28, pi. 11a, figs. 1-3. 

 1913. Dalmania (Hausmania) pleuroptyx Ohern, Geol. Surv., Md. Low. Dev., p. 510, 

 pi. 93, figs. 6-10. 



Description — One incomplete pygidium may be compared with this species. It is 

 depressed convex, triangular in outline with the axis depressed in the posterior region, 

 8 annulations present in part preserved; the intermediate furrows are deep and narrow, 

 obsolete down the center of the axis. Pleural lobes with broad segments, total number 

 unknown, divided longitudinally by faint median depressions, intermediate furrows 

 narrow and shallow. Ribs strongly oblique posteriorly; lateral margins flattened, 

 indistinct. 



Remarks — The specimens observed are too fragmentary to permit certain deter- 

 mination, but the characters preserved strongly suggest D. pleuroptyx. 



Horizon — Lower beds. 



Figured specimen No. 27540, Walker Museum. 



Dalmanites slocomi sp. nov. 



Plate 71, figure 20 



Description — Pygidium broadly triangular, moderately convex, ending posteriorly 

 in a caudal spine. The dimensions of the type specimen are: Length 35 mm., width 

 45 mm. Axis depressed, conical, margins tapering uniformly, apex rounded, extending 

 to within 5 mm. from the posterior margin, marked by 15 or 16 low, somewhat flat 



