74 ME. E. N. WORTH ON THE IGNEOUS CONSTITUENTS OF THE 



remains of decayed porphyritic felspars, quartz-blebs, and little 

 nests of black mica, the latter a feature of frequent occurrence 

 in many elvans. Teignmouth. 



7. Dark red rock, presenting much the same general characters. 



Teignmouth. 



8. Keddish-grey granular open-textured rock, with blebs of quartz, 



mica-nests, and felspar-cavities lined and partly filled with 

 kaolin ; some red iron -oxide in irregular cavities. Teign- 

 mouth. 



9. Grey granular rock of trachytic aspect, with some porosity; 



cavities with remains of kaolinized felspars ; decayed mica ; a 

 little differentiated quartz. Teignmouth. 



10. Pinkish-brown felsite, rough texture, slightly vesicular ; por- 



phyritic felspars ; fluxion-structure indicated. Teignmouth. 



11. Somewhat similar rock with quartz-blebs ; cavities with kaoli- 

 nized matter ; some white mica ; porous rather than vesicular. 

 Teignmouth. 



12. Yellowish-brown quartz-porphyry, loose-textured subvesicular 



base, with quartz-blebs and developing felspars in part kaoli- 

 nized ; matrix very porous in parts, yet heav}^ Under the 

 microscope this rock shows hardly a trace of felsitic reaction, 

 though it does not suggest a texture between felsitic and 

 andesitic so closely as some of its associates. There is a little 

 mica. Dawlish. 



13. Greenish rhy elite or liparite with compact base, and large 



cavities, elongated in direction of flow ; occurs in wall at 

 Teignmouth ; and is no doubt from conglomerate. 



14. Pinely vesicular rhyolitic rock with compact semivitreous green- 



grey base ; porphyritic quartz and felspar, the latter partly 

 kaolinized ; nests of mica ; shows distinct fluxion-structure. 



15. Earthy-textured red and grey felsite with porphyritic felspars, 



nests of mica, and vesicles partially filled with kaolin. Teign- 

 mouth. 



16. Red felsite with porphyritic quartz and felspar, quartz pre- 



dominating. Torbay. 



17. Vesicular felsite (" horny " base) with porphyritic quartz, mica, 



and felspar ; full of irregular cavities. Torbay. 



18. Eed porphyritic felsite with quartz, kaolinized felspar, a little 



mica ; somewhat open-textured. Torbay. 



19. lieddish coarse-grained porous variety, with mica more promi- 



nent ; shows flow-structure. 



20. Compact red felsite with porphyritic quartz, felspar, and mica. 

 Heavitree. 



21. Pinkish-grey felsite, subvitreous base, with porphyritic quartz 



and felspar, the latter partly kaolinized ; has a decidedly 

 rhyolitic look. Heavitree. 



22. Granular red felsite, porphyritic quartz and felspar ; some 

 decayed mica. Heavitree. 



23. Pinkish crystalline-granular felsite with porphyritic quartz and 



felspar ; small flakes of mica. Crediton. 



