72 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I48 



associated matrix at what stratigraphic level they were obtained. 

 Localities cited for the latter collections contain, in parentheses, 

 Stratigraphic data which is not listed in our catalogs and which 

 represents my own interpretation, based on experience in the areas in 

 question. For localities that I have not actually visited, this infor- 

 mation is followed, in parentheses, by a question mark. I have 

 collected from all other areas in the past 6 years, and feel certain of 

 the stratigraphic assignments. 



Lopha lugubris (Conrad) 



1. U.S.G.S. 513 — "Colorado Formation" (Juana Lopez equivalent ?), hills 



6 miles each of Mexican settlements on road from Jemez to Copper 

 City, N. Mex. 100 feet above massive gray sandstone standing on edge. 

 Collected by J. W. Powell, 1887. 



2. U.S.G.S. 747 — "Colorado Formation" (Juana Lopez Member of the 



Carlile Shale), Rattlesnake Buttes, 18 miles east of Walsenburg Post 

 Office, Colo. Collected by T. W. Stanton, 1890. 



3. U.S.G.S. 827 — "Colorado Formation" (Juana Lopez Member, Carlile 



Shale), near Malachite, Huerfano County, Colo. Collected by T. W. 

 Stanton, 1891. 



4. U.S.G.S. 833 — 100 to 600 feet above base of Colorado Shale (Juana Lopez 



equivalent ?), near Mancos, Colo. Collected by T. W. Stanton, 1891. 



5. U.S.G.S. 1306 — Benton (Subgroup: Juana Lopez Member, Carlile Shale), 



12 miles northwest of Pueblo, Colo., lat. 38°25', long. 104°47'. Collected 

 by G. K. Gilbert, 1893. 



6. U.S.G.S. 1380 — Upper Benton (Subgroup: Juana Lopez equivalent ?), 



mesa 5 miles west of Drip Springs, lat. 37 "38^ long. 104°30', Colo. 

 Collected by G. K. Gilbert, 1894. 



7. U.S.G.S. 2005 — Colorado (Group: Juana Lopez equivalent ?), about 



150 feet above top of Dakota Sandstone, railroad cut north of Thompson 

 Park, Colo. Collected by A. C. Spencer, 1897. 



8. U.S.G.S. 2009 — Colorado (Group), Mancos Shale (Juana Lopez equivalent 



?), near F — down corral on middle Mancos (River ?), La Plata Quad., 

 Colo. Collected by W. T. Lee. 



9. U.S.G.S. 2015 — Colorado (Group: Juana Lopez equivalent ?), west fork 



of Mancos (River ?), 10,700 feet elevation, Colo. Collected by W. 

 Cross. 



10. U.S.G.S. 2019 — Colorado (Group: Juana Lopez equivalent in Mancos 



Shale), second fossil layer exposed northwest of Mancos, Colo. Col- 

 lected by Mr. Cane, 1895. 



11. U.S.G.S. 3673 — (Colorado Group, Juana Lopez equivalent), "Ostrea" 



lugubris zone, Rio Puerco, about 5 miles above San Ygnacio, Albuquer- 

 que Quad., N. Mex. Collected by T. W. Stanton, 1906. 



12. U.S.G.S. 4358 — Benton (Subgroup), fine brown sandstone ledges 400 feet 



above Dakota Sandstone (Juana Lopez equivalent). Willow Creek at 

 the old wagon road south of Blue Mountain, sec. 12, T. 3 N., R. 102 W., 

 coal fields of northwest Colorado and adjacent territory. Collected by 

 H. S. Gale, 1907. 



