Jan., 1905.] 
Aetinolophus minutus. 
263 
3. A. minuiub, n. sp. 
Body spherical, diameter 12/x including gelatinous envelope 
approximately 1/j. thick. Length of pedicle 70 /j., diameter Ip.. 
Extremely fine short pseudopodia of about 2p in length extend 
beyond the envelope on all sides. Nucleus suboval situated in 
the inferior part of the body. Contractile vesicle (?). Base of 
pedicle (in the form studied) imbedded in a gelatinous mass 
10- 12/x in extent containing small algse, etc. 
Gambier, Ohio, U. S. A. 
A single specimen observed Oct. 29, 1904, in sediment from 
an aquarium jar containing Hydra fusca, the entire contents of 
the jar having been collected Sept. 13. 1904, in the Kokosing 
River at Gambier and subsequently covered with a glass plate for 
the purpose of preventing too rapid evaporation. The form was 
under observation at intervals during a period of four hours. 
4. A. capitatus, Penard. 1890 A. c. Penard, Jahrb. nassau. Ver. v. 
43 p. 16 t. If. 11. 1896 A. c. Schaudinn, Das Tierreich, Heliozoa, Berlin, 
p. 12. 1901 A. p. Sand. Etude monographique sur le groupe des Infu- 
sorres tentaculiferes, Ann. Soc. Beige de Microscopie. 1904 A. c. Penard, 
Les Heliozoaires d’eau douce, Geneva, p. 316. 
Diameter 30/x, length of pedicle 90p. Nucleus (?), Contractile 
vesicle, Pseudopodia few in number, knobbed. 
In fresh water, Germany. 
Penard described this species in 1890 from a single individual 
referring it to the genus Aetinolophus although noting its close 
relationship with the tentaculiferous infusoria. Sand, 1901, in 
his study of that group came to the conclusion that A. capitatus 
was nearer related to the Heliozoa than to the Suctoria for the 
following reasons, (a) the pedicle resembles that of Clathrulina 
elegans, (b) the pedicle does not penetrate into the gelatinous 
envelope as in Tokophrya limbata one of the Suctoria. (c) the 
nucleus is excentric, (d) the species closely resembles A. pediin- 
culatus. Penard, 1904, in his paper on the fresh water Heliozoa, 
after having examined several more specimens which he remarks 
are exceedingly rare, insisted on the suctorian nature of the form, 
maintaining that the points raised by Sand have little value. 
Penard at the same time suggests the desirability for a further 
study of the form. Consequently it seems advisable at present 
to allow it to remain in the genus Aetinolophus. 
BIBLIOGR.\PHY. 
Schulze, F. E. 1874, Rhizopodienstudien, Arch. f. mikr. Anat., v. 10. 
Penard, Eugene, 1890, Ueber einige neue oder wenig bekannte Pro- 
tozoen, Jahrb. Nassau Ver. f. Naturk. Jahrg. 43. 
Zacharias, O. 1893, Forschungsber. Biol. Stat. Plon, v. 1. 
Schaudinn, Fritz, 1896, Das Tierreich, Heliozoa, Berlin, 
Sand, Rene. 1901, Etude monographique sur le groupe des Infusoires 
tentaculiferes. Ann. de la Soc. Beige de Microscopie 
Penard, Eugene. 1904. Les Heliozoaires d’eau douce. Geneva. 
Kenyon College, Gambier, Ohio. 
