259 



all parallel. In Eupodiscue maculatus, the disc is divided into 

 ten, but the rows of cells do not converge towards the cewtre, ex- 

 cept one at the side of each sector, to which the others are parallel. 

 From this may be derived the very beautiful and peculiar con- 

 struction of the Coscinodiscus eccentricus, in which the disc is 

 divided into seven sectors, the rows of cells extending across the 

 valve from each sector to meet similar rows from the second sector 

 beyond. 



The following Donations to the Library were announced : — 



Archives du Museum d'Histoire Naturelle. Publiees par les Pro- 

 fesseurs de cet etablissement. Tome VII., Liv, 1 & 2. 4to. 

 — From the Museum. 



Actuarial Tables ; Carlisle Three-per-Cent. Single Lives and Single 

 Deaths. With Auxiliary Tables. By William Thomas Thom- 

 son, F.R.S.E., F.I.A. 4to. — From the Author. 



On the application of Cast and Wrought Iron for Building Pur- 

 poses. By William Fairbairn, C.E. 8vo. — From the Author. 



Jahrbuch der Kaiserlich Koniglichen Geologischen Reichsanstalt. 

 1853. IV. Jahrgang. 8vo. — From the Institute. 



Denkschriften der Kaiserlichen Akademie der Wissenschaften. Ma- 

 thematisch-Naturwissenschaftliche Classe. Band VI. 4to. 



Sitzungsberichte der Kaiserlichen Akademie der Wissenschaften. 

 Mathematisch-Naturwissenschaftliche Classe. Band XI. 8vo. 

 — From the Academy. 



Memoires de I'Academie des Sciences de I'lnstitut de France. 

 Tome XXIV. 4to. — From the Academy. 



Memoirs of the Geological Survey of the United Kingdom. British 

 Organic Remains. Parts 1, 2, 3, 4, 6, 7. 4to. 



Memoirs of the Geological Survey of Great Britain, and of the Mu- 

 seum of Practical Geology in London. Vol. II. Pts. 1 & 2. 8vo. 



Museum of Practical Geology and Geological Survey. Records 

 of the School of Mines and of Science applied to the Arts. 

 Parts 1, 2, 3, 4. 8vo. (With various Maps and Pamphlets.) 

 — From H. M. Government. 



Journal of the Geological Society of Dublin. Vol. VI., Part 1. 

 8vo. — From the Society. 



The Assurance Magazine, and Journal of the Institute of Actuaries. 

 Vol. IV., Part 3. 8vo. — From the Institute. 



