14 BULLETIN 81, UNITED STATES NATIONAL MUSEUM. 



APUS Sehoch. 



Apus ScHocH, Mikr. Thiere Siissw.-Aquar., 1868, pt. 2, p. 22; not Apus Scopoli, 1777, 

 Aves. 



Genus ARTHROGLENA BergendaL 



Arthroglena Bergendal, Acta Univ. Limdensis, vol. 28, 1892, sect. 2, No. 4, p. 96. 

 Type (monotype). — Arthroglena lutkeni Bergendal. 



ARTHROGLENA LUTKENI BergendaL 



Arthroglena lutkeni Bergendal, Acta Univ. Lundensis, vol. 28, 1892, sect. 2, No. 4, 

 p. 96, pis. 5, 6, fig. 30. 



ARTHROGLENA ROSTRATA (Dixon-NuttaU and Freeman). 



Arthroglena rostrata v. Hofsten, Ark. Zool., Stockholm, vol. 6, No. 1, 1909, p. 21, fig. 3. 



This species appears to be totally different from Diglena rostrata 

 Dixon-Nuttall and Freeman, which is given as a synonym. 



Genus ASCOMORPHA Perty. 



Ascomorpha Perty, Mitth. Nat. Ges. Bern, 1850, p. 18=Sacculus Gosse, Ann. Mag. 

 Nat. Hist., ser. 2, vol. 8, 1851, p. 198. 

 Type (monotype). — Ascomorpha ecaudis Perty. 



ASCOMORPHA EUCADIS Perty. 



Ascomorpha ecaudis Perty, Mitth. Nat. Ges. Bern, 1850, p. 18. 



Sacculus viridis Gosse, Ann. Mag. Nat. Hist., ser. 2, vol. 8, 1851, p. 198. Type (mono- 

 type) of genus Sacculus Gosse, 1851. 



Ascomorpha helvetica Perty, Zur Kenntn. kleinst. Lebensf., 1852, p. 39, pi. 2, fig. 1= 

 Ascomorpha ecaudis renamed. 



Ascomorpha germanica Leydig, Zeitschr. Wiss. Zool., vol. 6, 1854, p. 45, pi. 3, fig. 34. 



Sacculus germanicus Hudson and Gosse, Rotifera, SuppL, 1889, p. 17, pi. 32, fig. 25. 



Ascomorpha agilis Zacharias, Forschungsber. Biol. Stat. Plon, vol. 1, 1893, p. 22. 

 pi. 1, fig. 3. 



ASCOMORPHA MINIMA v. Hofsten. 



Ascomorpha minima v. Hofsten, Ark. Zool. Stockholm, vol. 6, No. 1, 1909, p. 88. 

 fig. 22. 



ASCOMORPHA SALTANS Bartsch. 



Ascomorpha saltans Bartsch, Jahresh. Ver. Naturk. Wurttemberg, vol. 26, 1870, p. 



364. 

 ? Sacculus hyalinus Kellicott, Proc. Amer. Soc. Micr., vol. 10, 1888, p. 92, fig. 

 Sacculus saltans Hudson and Gosse, Rotifera, Suppl., 1889, p. 16, pi. 32, fig. 24. 

 ? Ascomorpha hyalina Jennings, Amer. Naturalist, vol. 35, 1901, p. 738, pi. 3, fig. 56. 



Western, in Journ. Quekett Micr. Chib, ser. 2, vol. 5, 1894, p. 

 427-428, suggests that Sacculus Tiyalinus is founded on young speci- 

 mens of Ascomorpha saltans. There seems to be nothing in Kelli- 

 cott's description to disprove this view. Like a few other species of 

 Rotatoria, Ascomorpfia saltans harbors symbiotic Zoochlorellse, that 

 give a green color to the body of the fullgrown animal; the young are, 

 however, hyaline. 



