Reviews, 151 



from which point the sides rapidly converge to the beak ; apical 

 angle about 90° ; both valves rather convex along the middle, 

 thence descending with a flat or gently convex slope to the sides 

 and front margin. Surface with distinct sub-imbricating con- 

 centric ridges and fine striae, and when partially exfoliated obscure 

 longitudinal striae are visible. 



The width at one fourth the length from the beak is usually 

 one fourth less than it is at one sixth the length from the front 

 margin. The following are the measurements of a specimen of 

 the ordinary form. 



Length, 12^ lines. 



Width at 3 lines from beak, 6^ lines. 



Width at 2 lines from front, 9 lines. 



The largest specimen found measures nearly one inch and a 

 half in length. 



The proportions vary somewhat in different individuals. The 

 species is about the size of L. quadrata but differs therefrom in 

 being narrowed from the front upwards. 



Formation and Locality/. — Murray Bay ; in rocks which appear 

 to represent the Black River formation. 



Collector. — This fine species was discovered by Dr. J. W. Daw- 

 son. 



REVIEWS AND NOTICES OF BOOKS. 



The limits of exact science as applied to History. — An inaugural 

 lecture delivered before the University of Cambridge, by the 

 Rev. C. Kingsley, M.A., Professor of Modern History. 



Mr. Kingsley, the well known and truly distinguished author 

 of Alton Locke, Hypatia, Westward, Ho ! and other works of 

 fictitious literature, has lately been appointed to succeed, in the 

 chair of Modern History in the University of Cambridge, the late 

 justly esteemed and eminent thinker and critic Sir James Ste- 

 phens. That he will fill this chair with honor to himself and to 

 the University is not doubted by those who are acquainted with 

 the historical character and philosophical tendency of his numer- 

 ous and delightful writings. He belongs to that school of men 

 in the Church of England, now known as the " Broad Church," 

 and his name has long been associated with liberal ideas of reli- 

 gion, politics and education. He has always been forward to pro- 



