20 BULLETIN 53, UNITED STATES NATIONAL MUSEUM. 



22937. Acanthoceras ? kanabense Stanton. Cotypes. 



Colorado (Cretl). Upper Kanab, Utah. 



Stanton, BullI No. 106, U. S. Geol. Surv., 1893, p. 181, pi. 36, 

 figs. 6-S. ; : 



4341 1. Acanthocladia anceps Schlotheim. Plesiotypes and figured 



sections. 

 Permian. Poesneck. Germany. 



Ulrich, Geol. Surv. 111., VIII, 1890, p. 635, pi. 56, figs. i-ic. 



43409. Acanthoclema confluens Ulrich. Plesiotypes. 



Keokuk (Miss.). Nauvoo, Illinois. 



Ulrich, Geol. Surv. 111., VIII, 1890, p. 662, pi. 70, figs. 5-50. 



38844. Acanthotelson ? magister Packard. Holotype. 



Upper Coal Measures. Mazon Creek, Grundy County, 

 Illinois. 



Packard, Mem. Nat. Acad. Sci., Ill, 1886, p. 125, pi. 1, fig. 2;pl. 2, 

 figs. 4, 5- 



38845. Acanthotelson stimpsoni Meek and Worthen. Plesiotypes. 



Upper Coal Measures. Mazon Creek, Grundy County, 

 Illinois. 

 Packard, Mem. Nat. Acad. Sci., Ill, 18S6, p. 123, pi. 2, figs. 1-3. 



8163. Acella haldemani White. Cotypes. 



Bear River (Cret.). Mouth of Sulphur Creek, Wyoming. 



White, Twelfth Ann. Rept. U. S. Geol. Surv. Terr., 1878, Pt. I 

 (18S3), p. 84, pi. 30, figs. 9a, 9b; Third Ann. Rept. U. S. 

 Geol. Surv., 1SS3, p. 445, pi. 6, figs. 18, 19. 



See Tortacella haldemani. 



20066. Acella micronema White. Cotypes. 



Eocene; Wales, Utah. 



White, Bull. No. 34, U. S. Geol. Surv., 1886, p. 22, pi. 2, fig. 14. 

 [Limnaea (Pleurolimnsea) tenuicostata Meek and Hayden. T. W. 

 Stanton.] 



8030. Acervularia adjunctiva White. Cotype. 



Dower Carboniferous. Blackfoot Range, south of Yellow- 

 stone National Park. 



White, Proc. U. S. Nat. Mus., II, 1880, p. 255, pi. 1, figs. 1-3; 

 Twelfth Ann. Rept. U. S. Geol. Surv. Terr., 1878, Pt. I 

 (18S3), p. 120, pi. 35, figs, ia-id. 



14568. Acervularia pentagona ( Goldfuss). Plesiotype. 



Upper Devonian. Treasure Hill, White Pine District, 

 Nevada. 



Mefek, Rept. U. S. Geol. Expl. 40th Par., IV, Pt. I, 1877, p. 31, 

 pi. 2, figs. 5, 5a. 



43022. Acidaspis callicera Hall and Clarke. Plastotype. 



Onondaga (Dev.), Cayuga, Ontario, Canada. 



Hall and Clarke, Nat. Hist. New York, Pal. VII, 1888, p. 69, pi. 

 16b, fig. 7. 



