I. GEOLOGY. 709 



16, 17. Serpentine from Real del Dugue (Serrania de Ronda), formed of 

 serpentine and magnetite. 



18. Serpentine from Ronda, formed of serpentine and magnetite. 



19. Serpentine from Torrevieja (Alicante), formed of serpentine and 



magnetite. 



20-22. Serpentine from Barranco de San Juan (Granada), formed of ser- 

 pentine and magnetite. 



23. Serpentine from the Sierra of Guejar (Granada), formed of serpentine 



and magnetite. 



24. Chlorite state of Cogulludo, formed of chlorite and magnetite. 



25. Anthrakonite from Galicia, formed of fetid calcite. 



26. Nummulitic limestone from San Vicento de la Barguera (Santauder). 



27. Cipolin from Robledo de Chavela (Madrid), formed of calcite and 



muscovite. 



28. Chloritic limestone from Almaden, formed of calcite chlorite. 



29. Obdurate clay of Segovia (cretaceous period), formed of clay, quartz.* 



30. Clay slate of Peha de Penilla (silurian age), Segovia, formed of clay, 



feldspar, and quartz. 



31. Talcose slate of the Escorial, formed of talc, quartz, and muscovite. 



32. Felsyte from the Barranco del Cebollon, Granada, formed of felsyte, 



quartz, amphibole. 



33. 34. Felsyte from the Escorial, formed of felsyte alone. 



35. Felsyte from Peguerinos (Avila) formed of felsyte, quartz.f 



36. Granite from Robledo de Chavila (Madrid), formed of orthoclase, 



quartz, muscovite, and hornblende. 



37. Gneiss from Chapas de Marbella (Serrania de Ronda), formed of 



orthoclase, quartz, muscovite, apatite.^ 



38. Gneiss from Mij as* (Serrania de Ronda), formed of orthoclase, quartz, 



and muscovite. 



39. Garnetiferous gneiss from Huertal (Granada), formed of orthoclase, 



quartz, muscovite, garnet, and picotite. 



40. Gneiss from Robledo de Chavila (Madrid), formed of orthoclase, quartz, 



muscovite, and hornblende. 



41. Gneiss from the Escorial, formed of muscovite and quartz and ortho- 



clase. 



42. Micaceous gneiss from the Escorial, formed of muscovite and quartz. 



43. Coccolite with garnetite from the Escorial, formed of diopside and 



garnet. 



44. Coccolite from Riara (Segovia), formed of diopside, garnet, hematite,. 



quartz with fluid cavities, and apatite. 



45. Coccolite from Riarja (Segovia), formed of diopside and hematite. 



46. Coccolite with garnetite from Riarja, Segovia, formed of diopside and- 



garnet. 



47. Garnetite from Riarja (Segovia), formed of garnet and diopside. 



48. Hyalomicte from Riarja (Segovia), formed of quartz and muscovite. 



49. Ophite from Puerto Real, Cadiz, formed of plagioclase, augite, diallage, 



epidote, hornblende, magnetite. [| 



* Excursion geologica por la provincia de Segovia, por Don Alfonso de Aristo y Sarri- 

 naga y Don Francisco Quiroga y Rodriguer. Anales de la Socd. Espanola de Hist. 

 Natural, J. iii. 



t Anales de la Soc. Esp. de Hist. Nat. J. iv. Actas, p. 73, sesion del 1 de Setz. de 1875. 

 Paper read by F. Quiroga. 



t See (*), p. , and Memoria lObre la estructura de la Serrania de Ronda, by T. Mac- 

 pherson. Cadiz, 1874. 



Observaciones sobre algunas rocas de Riarja (Segovia), by Quiroga. An. de la Soc. 

 Esp. de Hist. Natural, J. v. 



|| Bosquijo geologico de la provincia de Cadiz, por T. Macpherson. Cadiz, 1872, and 

 An. de la Soc. Esp. de Hist. Nat. J. v. 



