4 PUBLICATIONS OP THE PAY SOCIETY. 



For the Eleventh Year, 1854. 



26. Bibliograpliia Zoologige et Geologise. A General Cata- 

 logue of all Books, Tracts, and Memoirs on Zoology and 

 Geology. By Louis Agassiz. Edited by H. E. Strickland. 

 Vol. IV. N-Z. vi + 604 pp. 8vo. 1854. 



For the Twelfth Year, 1855. 



27. A Monograph of the Bi^itish Nudibranchiate Mollusca. 

 By Joshua Alder and Albany Hancock. Part VII. vi + 54 

 + 40 + xlvi pp., 9 plates. Folio. 1855. 



For the Thirteenth Year, 1856. 



28. A Monograph of the Fresh-water Polyzoa, including all 

 the known species, both British and Foreign. By George 

 James Allman. viii + 122 + 22 pp., 11 plates. Folio. 1856 



[1857]. 



For the Fourteenth Year, 1857. 



29. The Recent Foraminifera of Great Britain. By William 

 Crawford Williamson. xx + 108 pp., 7 plates. Folio. 

 1858. 



For the Fifteenth Year, 1858. 



30. The Oceanic Hydrozoa ; a Description of the Calyco- 

 phoriclge and Physophoridae. . . . By Thomas Henry Huxley. 

 x + 144 + 24 pp., 12 plates. Folio. 1859. 



For the Sixteenth Year, 1859. 



31. A History of the Spiders of Great Britain and Ireland. 

 By John Blackwall. [Part I.] vi + 174 + 24 pp., 12 

 plates. Folio. 1861. 



For the Seventeenth Year, 1860. 



32. Introduction to the Study of the Foraminifera. By 

 William B. Carpenter, assisted by William K. Parker and 

 T. Rupert Jones, xxii + 320 4- 44 pp., 22 plates. Folio. 

 1862. 



For the Eighteenth Year, 1861. 



33. On the Germination, Development, and Fructification of 

 the Higher Cryptogamia, and on the Fructification of the 

 Coniferae. By Wilhelm Hofmeister. Transl. by Frederick 

 Currey. xviii + 506 pp., 65 plates. 8vo. 1862. 



