406" BULLETIN 53, UNITED STATES NATIONAL MUSEUM. 



97379. Mitra holmesii Dall. Holotype. 



Pliocene. Near Fort Thompson, Caloosahatchie River. 

 Florida. 



Dall, Trans. Wagner Free Inst. Sci. Phila., Ill, Pt. I, 1890, 

 p. 92, pi. 3, fig. 11. 



97384. Mitra lineolata Heilprin. Plesiotypes. 



Pliocene. Caloosahatchie River, near Fort Thompson, 

 Florida. 



Heilprin, Trans. Wagner Free Inst. Sci. Phila., I, 1887, p. 133, 

 pi. 16a, fig. 74.— Dall, ibid., Ill, Pt. I, 1890, p. 91. 



1 15799. Mitra marylandica Clark. Cotype. 



Eocene. Pamunkey Neck, Ma^dand. 



Clark, Johns Hopkins Univ. Circ. No. 15, 1895, p. 4; Bull. No. 141, 

 U. S. Geol. Surv., 1896, p. 66, pi. 11, figs. 3a-b. 



1 121 12. Mitra (mississippiensis var. ?) silicata Dall. Holotype. 



Oligocene. Tampa, Florida. 



Dall, Trans. Wagner Free Inst. Sci. Phila., Ill, Pt. I, 1890, 

 p. 93, pi. 4, fig. 11. 



97381. Mitra willcoxii Dall. Holotype. 



Pliocene. Near Fort Thompson, Caloosahatchie River, 

 Florida. 



Dall, Trans. Wagner Free Inst. Sci. Phila., Ill, Pt. I, 1890, p. 93, 

 pi. 3, fig. 10. 



97383. Mitromorpha cincta Dall. Holotype. 



Pliocene. Near Fort Thompson, Caloosahatchie River, 

 Florida. 



Dall, Trans. Wagner Free Inst. Sci. Phila., Ill, Pt. I, 1890, 

 p. 95, pi. 3, fig. 6. 



162557. Mitromorpha intermedia Arnold. Holotype. 



Pleistocene. Deadman Island, off San Pedro, California. 

 Arnold, Mem. Calif. Acad. Sci., Ill, 1903, p. 223, pi. 4, fig. 10. 



97495. Mitromorpha pygmaea Dall. Holotype. 



Pliocene. Caloosahatchie River, near Fort Thompson, 

 Florida. 



Dall, Trans. Wagner Free Inst. Sci. Phila., Ill, Pt. I, 1890, 

 p. 95, pi. 10, fig. 3. 



1853. Modiola contracta Conrad. Holotype. 



Miocene. Sixteen miles south of Tres Pinos, Monterey 

 County, California. 



Conrad, Rept. Expl. and Surv. R. R. Miss. Riv. to Pacific Ocean, 

 V, 1S56, p. 325, pi. 5. fig. 35. 



1882. Modiola ( Perna ) formosa Meek and Hayden. Cotypes. 



Jurassic. Big Horn Mountains, Wyoming. 



Meek and Hayden, Proc. Acad. Nat. Sci. Phila., for 1861, p. 439. 

 See Yolsella formosa. 



