THE SUNKEN LAND OF BUS. — POOLE. 197 



ered to serpentine and limonite. There are a few small pheno- 

 crysts of felspar. 



Specimen c. — S. S. " Minia," sounding 4, lat. 53° 20' N., long. 

 34' 40' W., 1397 fathoms. Porphyritic andesite or andesitic 

 basalt. In this rock there are a few small phenocrysts of 

 plagioelase felspar and brownish angite and magnetite. It 

 contains no olivine, and is not vesicular. All the n\inerals are 

 well preserved. 



Sjiecimen d.—S. S. '-'Minia," sounding 63, lat. 53' 14' 30" 

 N., long. 35"^ 15' W., 1440 fathoms. Perlitic tachylite, perfectly 

 fresh, with a few skeleton crystals of olivine, and phenocrysts 

 of plagioelase and greenish augite. The dark brown ground - 

 mass is very abundant, and is very free from microliths and 

 spherulites ; here and there it shows small rounded steam 

 cavities. 



Specinnen 1. — -S. S. "Faraday," station 62, lat. 50' 3' N., 

 long. 30° 46' 45" W., 1460 fathoms. Biotite gneiss, fine grained 

 and somewhat granulitic in texture. It is very rich in micro- 

 cline, but contains prcictically no muscovite ; quartz appears in 

 fine veins or strings, which are parallel to the foliation, as 

 indicated by the biotite. Orthoclase is common, but soda-lime 

 felspars are scarce. The biotite is brown, and is not abundant. 



Specimen 3, — Same locality. Fine-grained granular basalt, 

 very similar to specimen h, but without olivine. It contains 

 many small phenocr3^sts of brownish augite. 



Specimen S. — Same locality. A sheared biotite granite or 

 granite-gneiss, showing cataclastic structures throughout, and 

 much decomposed. It evidently originally contained biotite, 

 but this has been entirely replaced by epidote and chlorite. 



Sounding 50. — Brown or bufi'-colored gritty, containing one 

 pebble (a quarter of an inch in diameter) of black volcanic 

 glass. Insoluble residue, 43'77 per cent. Minerals: quartz, 

 (granitic, often brown stained, up to one millimetre in diameter, 



