300 FRESH-WATER BIOLOGY 



224 (221) Lorica with a stalk. Body may or may not fill the lorica. The 

 end of the lorica may be open or provided with slit-like 

 openings through which the tentacles extend. Tentacles 

 suctorial, knobbed, scattered, or in groups. 



Acineta Ehrenberg. 

 Representative species Acineta fluviatilis Stokes iSSs- 



Lorica subtriangular, compressed, very delicate, widest an- 

 teriorly, tapering to the attachment with the stalk. Stalk 

 shorter than the lorica. Two anterolateral openings for the 

 tentacles. Zooid usually filling the lorica. Length of lorica 

 40 to 80 n. Attached to aquatic plants. 



Fig. 559. Acineta flmiatilis. X 3i5- (After Stokes.) 



IMPORTANT REFERENCES ON MASTIGOPHORA AND INFUSORIA 



See list of general works under Sarcodina, p. 236; also the following: 

 Dangeard, p. a. 1902. Recherches sur les Eugleniens. Le Botaniste, 



8:97-357; 4Pl., 53 figs. 

 Kent, S. 1880-1882. A Manual of the Infusoria. 3 vols. London. 

 KoFOiD, C. A. 1898. Plankton Studies, II. Bull. 111. State Lab. Nat. 



Hist., 5: 273-300; 12 pi. 

 1899. Plankton Studies, III. Bull. 111. State Lab. Nat. Hist., 5:419- 



440; I pi. 

 Palmer, T. C. 1905. Delaware Valley Forms of Trachelomonas, Proc. 



Acad. Nat. Sci., Phila., 57: 665-675; i pi. 

 Powers, J. H. 1907. New Forms of Volvox. Trans. Amer. Micr. Soc. 



27:123-149; 4 pi. 

 1908. Further Studies on Volvox, with Descriptions of Three New Species. 



Trans. Amer. Micr. Soc, 2?)'. 141-176; 4 pi. 

 Roux, J. 1901. Faune Infusorienne des eaux stagnantes des environs de 



Geneve, 149 pp., 8 pL, 4to., Geneve. 

 Stokes, A. C. 1888. A Preliminary Contribution Toward a History of the 



Fresh Water Infusoria of the United States. Jour. Trenton Nat. Hist. 



Soc, 1:71-344; 13 pi. 



