TYPE SPECIMENS OF INVERTEBRATE FOSSILS. 663 



1 15458. Triforis guttata Guppy. Holotype. 



Pliocene. Maura, Trinidad, British West Indies. 



Guppy, Geol. Mag., London, Dec. II, I, 1874, p. 408, pi. 18, fig. 27. 



113315. Triforis mitella Dall. Holotype. 



Oligocene. Chipola River, Calhoun County, Florida. 



Dall, Trans. Wagner Free Inst. Sci. Phila., Ill, Pt. II, 1892, 

 p. 265, pi. 21, fig. 10. 



8645. Trigonarca depressa (White). Holotype. 



Colorado (Cret.). Six miles below Casa Salazan, New 

 Mexico. 



Stanton, Bull. No. 106, U. S. Geol. Surv., 1893, p. 93, pi. 19, fig. 2. 



See Idonearca depressa. 



348. Trigonarca (Breviarca) exigua (Meek and Hayden). Holo- 



349. type and paratype. 

 Fort Pierre (Cret.). Mouth of Milk River, Montana, and 



near forks of Cheyenne River, South Dakota. 



Meek, Rept. U. S. Geol. Surv. Terr., IX, 1S76, p. 93, pi. 15, figs. 

 2a-f. 



See Cucullsea exigua. 



22869. Trigonarca obliqua (Meek). Plesiotype. 



Colorado (Cret.). Huerfano Park, Colorado. 



Stanton, Bull. No. 106, U. S. Geol. Surv., 1893, p. 92, pi. 19, fig. 

 1 ; pi. 20, figs. 2-6. 



7794. Trigonia americana Meek. Cotypes. 



7819. Jurassic. Near Dower Canyon of the Yellowstone River, 



Montana. 



White, Twelfth Ann. Rept. U. S. Geol. Surv. Terr., Pt. I, 1S83, 

 p. 148, pi. 38, figs, ia-ib. 



212. Trigonia conradi Meek and Hayden. Cotypes. 



Jurassic. Southwest base of Black Hills, South Dakota. 



Meek and Hayden, Proc. Acad. Nat. Sci. Phila., for i860, p. 183; 

 Pal. Upper Mo., Smithsonian Cont. to Knowl. No. 172, XIV, 

 1864, p. 83, pi. 3, fig. 11. 



28935. Trigonia elegantissima Meek. Plesiotype. 



Jurassic. Devils Slide, Cinnabar Mountain, Montana. 



Stanton, Mon. XXXII, Pt. II, U. S. Geol. Surv., 1S99, p. 619, 

 pi. 73, fig. 2. 



9849. Trigonia emoryi Conrad. _ Holotype. 



Washita (Lower Cret.). Between El Paso and Frontera, 

 Texas. 



Conrad, Rept. U. S. Mexican Bound. Surv., Emory, I, Pt. II, 1857, 

 p. 148, pi. 3, figs. 2a-c. 



30230. Trigonia emoryi Conrad. Plesiotypes. 



Buda (Lower Cret.). Near Austin, Texas. 



Shattuck, Bull. No. 205, U. S. Geol. Surv., 1903, p. 23, pi. 8, figs. 

 6-8. 



