CATALOGUE OF FOSSILS. 93 



60. EJiynclionella Myrina Whitfield. Vermilion Hog-backs, Northwest- 

 ern Colorado. 



61. Ostrea strigilecula White. Island Park and Flaming Gorge, Utah; 

 and Vermilion Hog-backs, Northwestern Colorado. ' 



62. Ostrea (Alcdryonia) procumbens White. Vermilion Hog-backs, 

 Northwestern Colorado. Shell of moderate size, irregularly ovate in mar- 

 ginal outline ; margins coarsely dentate ; valves moderately thick, usually 

 attached by nearly the whole surface of the lower one. 



63. Camptonedes stygius White. Lower end of Long Valley ; mouth 

 of Thistle Creek, Spanish Fork Canon ; Upper Kanab ; and three or four 

 miles south of Kanara, Utah. 



64. Camptonedes bellistriatus Meek and Hayden. Three or four miles 

 south of Kanara, Utah. 



65. Camptonedes platessiformis White. North base of Aquarius Pla- 

 teau, Southern Utah. Resembles C. platessa White in its surface-markings, 

 and C. Stygius White in its marginal outline. 



66. Gervillia 1. Nortli base of Aquarius Plateau, Southern 



Utah. Resembles G. Montanacnsis Meek, but the axis of the shell is more 

 oblique to the hinge-line, and the wing narrower than in that species. 



67. Pinna - -?. Mouth of Thistle Creek, Spanish Fork Canon, 

 Utah. Surface radiately ribbed both above and below the median angle; 

 probably a new species, but the specimens are too imperfect for satisfactory 

 description. 



68. Modiola sttbimbricata Meek. Vermilion Hog-backs, Northwestern 

 Colorado. 



69. Myophoria f. Island Park, Utah. * 



70. Trigonia Americana Meek. Flaming Gorge, Utah. 



71. Trigonia Montanaensis Meek. North base of Aquarius Plateau, 

 Utah. 



72. Trigonia Conradi Meek and Hayden. Flaming Gorge, Utah. 



73. Trigonia f. Santa Clara River, two miles below Gunlock, 



Utah. 



74. Unio Stewardi White. Flaming Gorge, Utah. Described on a fol- 

 lowing page. 



