24 Proceedings of the Royal Fhysical Society. 



those of the Geological Survey, notably the collection made 

 by Messrs B. N. Peach and A. Macconochie,* and we have 

 tlie followins^ results as re2;ards molluscan life of the Silurian 

 series of Lemahau'ow : 



Lingidct minima we have already referred to. Two others 

 of the Brachiopoda are only indicated species, and the third 

 Strophomena rhomboiclalis (Wahl.), has a wide range through- 

 out the Silurian series. The Bivalves are essentially of a 

 high Silurian type, and correspond to those of the English 

 Ludlow group. 



In 1866 appeared the seventh part of Mr Davidson's 

 magnificent work, " A Monograph of the British Fossil 

 Brachiopoda," forming the first part relating to the Silurian 

 species. It is unnecessary to recapitulate the names of the 

 shells described by Mr Davidson, as they have, more or less, 

 been referred to in previous pages. Five species were 

 described and drawn from Scotch Silurian rocks in the first 

 part, referable to the Lingulidpe and Discinidse. In the 

 following year the second part of this work appeared contain- 

 ing descriptions of seven additional species, accompanied by 

 figures in the clear and vigorous style so peculiarly the 

 author's. The third and fourth parts were published in 1869 

 and 1871 respectively. 



Of Mr Davidson's work it would be presumptuous on my 

 part to speak. One feature, however, may be mentioned, 

 and taken to heart by many other pahcontologists — his work 

 is eminently practical, for his descriptions are the result of 

 work executed both in the field and cabinet. In 1835 Mr 

 Davidson accompanied the late Mr J. H. Cunningham in his 



* Mem. Gcol. Survey, Scotl., Expl. -I'd, 1873, pp. 55, 5Q. 



