377 



beds of the Middle Lias. Dr. Bryce now supplements that 

 amount of knowledge by further researches undertaken in 1869 

 and the three following years, and his observations as rendered 

 in his account, just referred to, afford us an ample acquaintance 

 with the development of the newer Middle Lias and the Upper 

 Lias in its Northward extension ; but on this account we refrain 

 from drawing more than closely relates to our present subject of 

 the Spinatus Zone, and besides, in the absence of the illustrative 

 accessories of Map and Sections, we would refer the reader to the 

 paper itself. The A. Spinatus beds of the Middle Lias are seen 

 in a section taken close to Tanna Point on the South East side 

 of Portree harbour. Isle of Skye. 



To summarize, the section details a total thickness of Am. 

 communis beds of 15 ft. 7 in. ; immediately under these come 

 about 60 ft. of Middle Lias as follows, of which I only quote 

 suf&cient to elucidate my subject. 



SECTION, TANNA POINT, ISLE OF SKYE. MIDDLE LIAS, 



(in descending order.) 



At p. 324, the East of Camus-Inivaig bay, the Spinatus beds 

 are again noted, still the same yellow calcareous sandstone 

 with sandy shales in the upper part of the series, and at p. 325, 

 near Prince Charles's cave, we note the following instructive 

 section, of which we give only the Liassic part. 



