The Sarcodina 265 



thick in others; or, foreign particles may be added to the outer surface. 

 In Diplogromia, the wall of the test is double, the outer layer being 

 arenaceous. The majority of species have been reported from fresh and 

 brackish waters. 



It is unfortunate that so little is known about these organisms since 

 they appear to be favorable material for investigating basic characteristics 

 of the Foraminiferida. Some of the Allogromiidae, at least, can be main- 

 tained in the laboratory and extensive investigation of their life-cycles 

 should prove interesting. Reproduction by schizogony, much as in the 

 more specialized marine types, and the production of amoeboid gametes 

 have been observed in Allogromia under laboratory conditions (3). Per- 

 haps further studies of this nature will answer various unsettled questions 

 concerning the generic composition of the family. 



The following genera have been referred to the Allogromiidae: Allogromia (3, 65, 

 124; Figs. 5. 36, E, 5. 44, E), test chitinous, ovoid to spherical; Amphitrema Archer (55, 

 107; Fig. 5. 44, A, G), foreign particles adherent to the chitinous test, one opening at 

 each end; Artodiscus Penard (107; Fig. 5. 44, C, D), affinities with the Allogromiidae 

 uncertain; Boderia Wright (124), peculiar marine types strikingly similar to a migra- 

 tory stage which occurs m early development of certain less primitive marine species 

 (Fig. 5. 35, D); Diaphorodnn Archer (107; Fig. 5. 33, C), with filopodia, sometimes 

 assigned to the Allogromiidae instead of the Testacida (Difflugiidae); Dactylosaccus 

 Rhumbler (123, 124), thin chitinous test tubular and twisted; Diplogromia Rhumbler 

 (124; Fig. 5. 43, H, I), double-walled test, outer layer of fine siliceous granules; 

 Diplophrys Barker (107; Fig. 5. 44, B), spheroid chitinous test, opening at each end; 

 Lecythiuin Hertwig and Lesser (Fig. 5. 44, F), filopodia, flexible chitinous test; L. 

 hyolinum H. and L. referred to genus Pamphagus by Penard (107); Lieberkiihnia 

 Clapar^de and Lachmann (107, 110, 124; Fig. 5. 43, J), chitinous test, ectoplasmic stalk 

 (peduncle) arises from the side of the body; Microgromia Hertwig and Lesser (146; 

 Fig. 5. 43, A-D), small, chitinous test; Micrometes Cienkowski (107, 147; Fig. 5. 43, E, 

 F), delicate chitinous test with several apertures; Myxotheca Schaudinn (38, 124), 

 marine, test thin, approximately spherical, usually with adherent foreign particles; 

 Plagiophrys ClaparMe and Lachmann (107; Fig. 5. 31, J, K), sometimes assigned to 

 the .Allogromiidae instead of the Testacida; Rhynchogromia Rhumbler (123; Fig. 5. 

 43, G), elongated chitinous test, terminal aperture; Rhynchosaccus Rhumbler (79, 123), 

 thin tubular chitinous test, opening at each end; Schulizella Rhumbler (124), delicate 

 spheroidal chitinous test, more than open aperture with variable positions. 



LITERATURE CITED 



1. Alexeieff, S. 1907. Arch. f. Frotistenk. 8: 95. 



2. 1912. Bull. Soc. Zool. France 37: 55. 



3. Arnold, Z. M. 1948. Trajis. Amer. Micr. Soc. 67: 231. 



4. Belaf, K. v. 1921. Arch. f. Frotistenk. 43: 287. 



5. 1922. Arch. f. Frotistenk. 46: 1. 



6. 1924. Arch. f. Frotistenk. 48: 371. 



7. Bisby, G. R. 1914. Amer. J. Hot. 1: 274. 



8. Bles, E. J. 1929. Quart. J. Micr. Sci. 72: 527. 



9. Blochmann, F. 1894. Biol. Centralbl. 14: 197. 



10. Bloomfield, J. E. and E. T. Schwartz 1910. Ann. Bot. 24: 35. 



11. Bonner, J. T. 1944. Amer. J. Bot. 31: 175. 



12. and D. Eldredge, Jr. 1945. Growth 9: 287. 



13. Borgert, A. 1909. Arch. f. Frotistenk. 14: 134. 



14. Brandt, K. 1902. Arch. f. Frotistenk. 1: 59. 



