THIRD REPORT OF THE DIRECTOR I906 I4I 



Lingula cuneata Derby. Proceedings of the 

 American philosophical society. 1879. 18: 168. 



Lingula cf. o b 1 a t a Clarke. Arch, do Mus. 

 Nac. do Rio de Janeiro. 1899. v. 10. Author's 

 Eng. ed. 1900. p. 4, pi. i, fig. 3. 



Siluric Rio Trombetas, Para, Brazil 



O. A. Derby & J. M. Clarke, donors 



LINQULOPS Hall 



Lingulops derbyi Clarke 



6283 -^V-^ TYPE: PLASTOTYPE Lingulops derbyi Clarke. 



Arch, do Mus. Nac. do Rio de Janeiro. 1899. v. 10. 

 Author's Eng. ed. 1900. p. 5, pi. i, fig. 4. 



Siluric Rio Trombetas, Para, Brazil 



O. A. Derby & J. M. Clarke, donors 



On slab with type of Tentaculites tro m bete n sis 

 Clarke, pi. 2, fig. 27. 



ORBicuLoiDEA d'Orbigny 

 Orbiculoidea hartti Clarke 



6284 ^-V-^ TYPE Orbiculoidea hartti Clarke. Arch. 



do Mus. Nac. do Rio de Janeiro. 1899. v. 10. 

 Author's Eng. ed. 1900. p. 7, pi. i, fig. 5, 6. 



Siluric Rio Trombetas, Para, Brazil 



O. A. Derby & J. M. Clarke, donors 



ORTHis Dalman 

 Orthis callactis Dalman var. amazonica Clarke 



6285 ^-9y^-^ TYPE Orthis callactis var . amazonica 



Clarke. Arch, do Mus. Nac. do Rio de Janeiro. 

 1899. V. 10. Author's Eng. ed. 1900. p. 9, pi. i, 

 fig. 17. 



Siluric Rio Trombetas, Para, Brazil 



O. A. Derby & J. M. Clarke, donors 



6286 ^V-^ TYPE: PLASTOTYPE Arch. do Mus. Nac. do Rio de 

 Janeiro. 1899. v. 10. Author's Eng. ed. 1900. 

 pi. I, fig. 18, 19. 



Siluric Rio Trombetas, Para, Brazil 



O. A. Derby & J. M. Clarke, donors 



2 



