Annual report of the United States Geological Survey to the Secretary of the Interior . ll but imperfect specimen in which but two ribs occur in the sinus. 3a. Specimen seen from above. Ouray limestone; Engineer Mountain 7. 4. A nearly perfect dorsal valve in which the fold is surmounted by four plications, the middle two being more prominent than those at the at the Shell seen from ;. Same; side view. Ouray limestone; Engineer Mountain 7. Mytilarca? sp 5. A left valve of a peculiar lamellibranch shell of uncertain affinities. The shape suggests a Mytilarca or a S
Annual report of the United States Geological Survey to the Secretary of the Interior . ll but imperfect specimen in which but two ribs occur in the sinus. 3a. Specimen seen from above. Ouray limestone; Engineer Mountain 7. 4. A nearly perfect dorsal valve in which the fold is surmounted by four plications, the middle two being more prominent than those at the at the Shell seen from ;. Same; side view. Ouray limestone; Engineer Mountain 7. Mytilarca? sp 5. A left valve of a peculiar lamellibranch shell of uncertain affinities. The shape suggests a Mytilarca or a Specimen seen from above. The outline has been restored in Side view of same in outline. Ouray limestone; Durango 294. sp 6. The left valve of a small lamellibranch shell, which maybe a represent- ative of the genus Modiomoi pha, but is possibly only a very young example of Allorixma Specimen viewed from above; enlarged,(i//. Side view of same; enlarged. Ouray limestone; Durango 291. 80 U. S. GEOLOGICAL SURVEY TWENTIETH ANNUAL REPORT. PART II. PL. VII. FOSSILS FROM THE OURAY LIMESTONE Tf-E MERIOFN GSAVJWE CO. LIBRARY OF THE UNIVERSITY of ILLINOIS. GIKTY.] DESCRIPTION OF PLATE VII CONTINUED. 81 Page. StRAPAKOLLIS CLYMENIOIDE8 ? 61 7. A small specimen referred to this species-. Much larger specimensoccur in the collections, but they are unfortunately too poor for ;i. Superior view. Ouray limestone; Durango Another small example similar to the Inferior Side view of the same. Ouray limestone; Durango (Isoxema) humilis 60 9. An imperfect specimen referred to this species in which the shell is retained, showing the shape of the peritreme and the nature of thesurface Superior view. 9b. Same; side view, showing the shape of the peritreme. This is seento be slightly different from the exfoliated examples figured limestone; Engineer Mountain 7. 10. Another specimen of
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