224 NATURALISTS’ ASSISTANT. 
Hyatt, A. Revision of North American Porifere. 
(Mem. Bost. Soe. ii, 1874.) 
Johnston, G. History of BritishSponges. 8vo. Edinburg, 
1842. 
Leidy, J. Flora and Fauna in living Animals. (Smithsonian 
Contributions v, 18538.) 
Leidy, J. Fresh Water Rhizopoda of North Amer- 
ica. (Hayden’s Survey.) 4to, 48 pls. 1880. 
Parker and Jones. Nomenclature of the Foraminifera. 10 pts., 
8vo. (London), 1859-72. 
Parker and Jones. On some Foraminifera from the North At- 
lantic. 4to, 8 pls. (London, 1865.) 
Pritchard, A. History of the Infusoria. 8vo. London, 1842. 
2edit. 8vo,13 pls. London, 1849. 
Quennerstedt, A. Contributions to the Swedish Infusoria 
fauna. 4to (Lund), 1866-70. (Swed.) 
Stein, Fr. Die Organismus der Infusionsthiere. 
3 vols., 4to, many pls. Leipzig, 1859-77. (Ger.) 
Williamson. Monograph Recent Foraminifera. (Ray Socy.) 
fol. London, 1857. 
