ROTATORIA OF THE OKOBOJI REGION 
279 
Trichocerca stylata (Gosse) (Plate VI, Fig. 67). Found in some abund- 
ance in Eake Okoboji (1), the canal (2), and the sand-bar pond (3). 
Diurella brachyura (Gosse) (Plate VII, Fig. 1). This species was 
found in a small pond opening from the drainage canal (2), together 
with several other species of Diurella. 
Diurella porcellus (Gosse) (Plate VII, Fig. 2). Four specimens of this 
were found in a small pond opening from the drainage canal (2). This 
is the species that is compared by Gosse to “a fat young pig” in ap- 
pearance. 
Diurella tenuior (Gosse) (Plate VII, Fig. 3). This species was found 
with others of the genus in a weedy canal pond (2). Four individuals. 
Diurella tigris (Muller) (Plate VII, Fig. 4). This is a common species, 
especially in the earlier part of the summer. Found in canal ( 2 ), kettle 
hole (4), kettle hole (7), and the fish ponds (16). 
Gastropus hyptopus (Ehrenberg) (Plate VII, Fig. 5). Two specimens 
were found in water from a swamp near West Okoboji (10). 
Ascomorpha eucadis Perty (Plate VII, Fig. 6). Several specimens 
were found near the mouth of the canal (2). 
Synchaeta pectinata Ehrenberg (Plate VII, Fig. 7). This species is 
common in Eake Okoboji (1), and in the sand-bar pond (3) ; a few indi- 
viduals came from the marshes near West Okoboji (10). One of the 
most active and vigorous species found. 
Polyarthra trigla Ehrenberg (Plate VII, Fig. 8). Common in Eake 
Okoboji (1) the canal (2), the sand-bar pond (3), and kettle hole (5); 
a few individuals were found in kettle hole (8) and in Hottes lake (18). 
Asplanchna brightwellii Gosse (Plate VII, Fig. 9). A fairly common 
species in Eake Okoboji (1), the canal (2), and the sand-bar pond (3). 
One of the most fascinating species to study. 
Asplanchna priodonta Gosse (Plate VII, Fig. 10). Found in kettle 
hole (4) ; one specimen. 
Asplanchnopus multiceps (Schrank) (Plate VII, Fig. 11). From a 
marsh near Manhattan (14), and Marble lake (20) ; one specimen from 
each locality. 
Testudinella mucronata (Gosse) (Plate VII, Fig. 12). Found with 
T. patina and T. truncata in water from the canal (2) ; rare. 
Testudinella patina (Hermann) (Plate VII, Fig. 13). Quite common; 
found in Eake Okoboji (1), canal (2), sand-bar pond (3), kettle hole 
(5), kettle hole (7), marshes at West Okoboji (10), Gull Point kettle 
hole (11), Green slough (12), Gar lakes (15), fish ponds (16), and 
Eittle Spirit lake (19). This beautiful creature was described by Muller 
as “animalculum crystallinum, splendore nulli secundum ^ a description 
which it really merits. 
Testudinella truncata (Gosse) (Plate VII, Fig. 14). Found with the 
other two representatives of the genus in the canal (2) ; rare. 
Pompholyx sulcata Hudson (Plate VII, Fig. 15). Found in a marsh 
near the upper end of Eake Okoboji (10) ; two Individuals. 
Pedalia mira (Hudson) (Plate VII, Fig. 16). This remarkably inter- 
esting “skipping rotifer” was found near the entrance of the canal (2), 
7 Hudson and Gosse, The Rotifera, volume II, p. 67. 
8 Quoted in Hudson and Gosse, The Rotifera, volume II, p. 112. 
