OF THE PROTOZOA. 81 



Sponges -will be found in Dr. Johnston's Tvork, cited above. 

 With reference to the fossil Spongidae, the following papers 

 may be consulted : — Boaverbajstk, ' On the Siliceous Bodies 

 of the Chalk, Greensand and Oolite,' Transactions of Geolo- 

 logical Society of London, 1841 ; J. T. Smith, * On the Ven- 

 triculidae of the Chalk,' Ann. Nat. Hist., 1847-8. See also 

 PiCTET, *Trait-e de Paleontologie,' 1857; and the paleonto- 

 logical treatises of D'Orbigny, already alluded to. 



GREGARINIDiE (including PSOROSPERMIiE). 



KoLUKER. — * Beitrage zur Kenntniss niederer Thiere.' Zeitschr. f. 



wiss. Zool., 1848. 

 LiEBERKiJHN. — ' Uebcr die Psorospermien.' Muller's Archiv, 1854. 

 Also Bruch, Zeitschr. f. wiss. Zool., 1850; Dufour, Annales 



des Sciences Naturelles, 1828; Frantzius, ' Obsei^vationes 



quaedam de Gregarinis,' 1846; Henle, Muller's Archiv, 1845; 



Leidy, Transactions of American Philosophical Society, 1S51 ; 



Leydig, Muller's Archiv, 1851 ; MIjller, ibid., 1841 ; Roein' 



'Histoire Naturelle des Vegetaux Parasites,' 1853; Stein, 



Muller's Archiv, 1848. 



INFUSORIA. 



Ehrexberg. — ' Die Infusionsthiere als volkommene Organismen,* 

 1838. 



DujARDiN. — ' Infusoires,' 1841. 



Stein. — ' Infusionsthiere auf ihre Entwickelungeschichte unter- 

 sucht,' 1854. 



Lachmann et Claparede. — ' Etudes sur les Infusoires et les Rhi- 

 zopodes,' Memoires de I'lnstitut National Genevois, 1858; 

 also, Muller's Archiv, 1856, and Ann. Nat. Hist. 1857. 



CoHN. — Various papers published in Zeitschr. f. wiss. Zool., 1851- 

 3-4 and 7. 

 See also the memoirs of Auerbach, Czermak, Ecker, and 

 CiENKOWSKY, in the same journal, together with those 

 of various writers in Ann. Nat. Hist., Ann. Sci. Nat., 

 Muller's Archiv, and Wiegmann's Archiv. Among these 

 may be mentioned : Carter, Ann. Nat. Hist., 1856-9; Haime, 

 Ann. Sci. Nat., 1853; LieberkIjhn, Muller's Archiv, 1856-7, 

 and Ann. Nat. Hist., 1856 ; Schneider, Miiller's Archiv, 1854, 



G 



