part 1] THROUGH THE ANDES OF PERU AND BOLIVIA. 59 



Fig. 7r. Profile view of a typical corallum, showing- the irregular nature of 



growth. Natural size. (See p. 45.) 

 8o. Lophophylloid Za/plxrentis, Carboniferous Limestone; Viscachani 



(Peru). View of calyx. Natural size. (See p. 44.) 

 Figs. 8 6-8 <7. Serial transverse sections showing septal development and 



Lophojjhylloid columella. Natural size. 

 Fig. 8e. Weathered specimen of young individual, showing extension of the 



counter- septum through the central axis. Natural size. 

 8 /. Vertical section of another specimen through the centre of the 



corallum. at right angles to the counter-septum ; showing the cut 



end of the latter as an axial rod penetrating the region of the 



cardinal fossula, as indicated by the depression of the tabular. 



Natural size. 

 Figs. 9«-9 e. Lophophylloid Zaphrentis, Carboniferous Limestone; Viscachani 



(Peru). Serial transverse sections of a specimen, showing septal 



development and cardinal and alar fossula? . Natural size. 



[Figs. 7 a, 8 6-8 d, 8/, 9 «-9 e, are of ground and polished specimens.] 



Plate II. 



Fig. 1. A 97. Dolerite, Mollendo : showing subophitic augite partly enclosing 

 lath-shaped crystals of plagioclase (andesine), the cloudy 

 appearance of the latter being due to the presence of minute 

 schiller-inclusions. (In ordinary light, X 36 diameters.) 

 See p. 11. 



2. A 91. Granite, Mejia : showing a large crystal of microchne. (Between 



crossed nicols, X 24 diameters.) See p. 10. 



3. A 79. Granodiorite, Quishuarani -. showing the first stage in dynamic 



metamorphism, with distortion and fracture of plagioclase. 

 (Between crossed nicols, X 24 diameters.) See p. 22. 



4. A 76a. Xenolith in granodiorite, kil. 129: showing the result of the 



recrystallization of the component minerals. Andesine 

 (clear), with abundant inclusions of magnetite and horn- 

 blende. Bluish-green hornblende (tinted) ; and biotite 

 (black). (In ordinary light, X 24 diameters.) Seep. 21. 



5. A 125. Andalusite-mica-schist, Ollachea : showing a large crystal of 



andalusite. (Between crossed nicols, X 24 diameters.) See 

 p. 52. 



6. A 127. Augite-syenite (laurvikite), Ollachea : showing titaniferous 



augite; olivine; apatite; orthoclase ; and magnetite (black). 

 (In ordinary light, X 24 diameters.) See p. 51. 



Plate III. 

 Raised beach at Mollendo. 



Plate IV. 

 View of the crater of El Misti. 



Plate V. 

 Devonian beds of Taya Taya. 



Plate VI. 



Geological section through the Andes, from Mollendo to the Inambari River. 

 Scales : horizontal, 1 : 400,000 ; vertical, 1 : 100,000. 



