Annual report of the United States Geological Survey to the Secretary of the Interior . Ventral valve seen from above. 4/;. Outline side view of Posterior view of same. Ouray limestone; Engineer Mountain 7. 5. Ventral valve of medium size with a high, flat area, directed at right angles to the plane of junction of the valves. The sinus is markedby numerous bifurcated striae, not well shown by the figure. 5a. Specimen seen from above. 5b. Same; side view in outline. 5c. Posterior view of same, showing wide Miray limestone; Durango 294. 6. A large ventral valve, with
Annual report of the United States Geological Survey to the Secretary of the Interior . Ventral valve seen from above. 4/;. Outline side view of Posterior view of same. Ouray limestone; Engineer Mountain 7. 5. Ventral valve of medium size with a high, flat area, directed at right angles to the plane of junction of the valves. The sinus is markedby numerous bifurcated striae, not well shown by the figure. 5a. Specimen seen from above. 5b. Same; side view in outline. 5c. Posterior view of same, showing wide Miray limestone; Durango 294. 6. A large ventral valve, with its high area nearly flat and inclined back- ward toward the plane of junction of the valves. The sinus is trav-ersed by coarse bifurcated «. Specimen seen from above. 65. Side view of same in outline, showing inclination of the area and its slight Posterior view of same, showing the broad limestone; Durango 291. 7. Dorsal valve of a transverse Shell seen from above. 70 U. S. GEOLOGICAL SURVEY TWENTIETH ANNUAL REPORT. PART II. PL. IV. FOSSILS FROM THE OURAY LIMESTONE UNIVERSITY oHLUNOiS. GIRTY.] DESCRIPTION OF PLATE IV CONTINUED. Spirifer disjunctus var. animasensis—Continued.~b. Same; side view in outline. Ouray limestone; Durango 294. 8. A dorsal valve of the subquadrate type, and of medium size. The fold is covered by a large number of bifurcated striae, finer than those at the Specimen seen from Side view of same in outline. Ouray limestone; Durango 21)4. 9. A large dorsal valve of subquadrate shape. The fold is traversed by numerous striae, large and fine, simple and Shell seen from Same; side view in outline. Ouray limestone; Durango 291. 10. A subquadrate dorsal valve of large size, in which the plications upon the fold are coarse and «. Specimen seen from ;. Side view of same in outline. Ouray limestone; Durango 291. PLATE V. 73 PLATE V. Spirifer coniculus
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