ROTATORIA OF THE OKOBOJI REGION 
275 
locality the algae had come. This is the smallest specfes of the genus 
found here. 
annulosa Gosse (Plate VI, Fig. 7). This species was 
found first on Ceratophyllum from the mouth of the canal (2). It was 
later recognized on a globe of Rivularia echinulata along with Notom- 
mata hrachyota^ q.v. 
Pleurotrocha sordida (Gosse) (Plate VI, Fig. 8). Found in tows made 
in the marsh near the north end of Eake Okoboji (10). Three individuals 
were taken. 
Cephalodella catellina (Muller) (Plate VI, Fig. 9). Two individuals 
of this species were found among weeds in a pond opening from the 
drainage canal (2). 
Cephalodella forficula (Ehrenberg) (Plate VI, Fig. 10). This species 
was found in Lake Okiboji (1), where it was rare; comfmon in the drain- 
age canal (2) ; a few individuals in kettle hole (7) ; and a few in kettle 
holes near West Okoboji (10). 
Dkischiza gibba (Ehrenberg) (Plate VI, Fig. 11). Fairly abundant in 
the canal (2) ; a few individuals from kettle hole (8) ; two from Hottes 
lake (18). 
Diaschiza gracilis (Ehrenberg) (Plate VI, Fig. 12). This very small 
form was found in considerable abundance both in the canal (2), and in 
the sand-bar pond (3). 
Diaschiza tenuior Gosse (Plate VI, Fig. 13). Somewhat similar in ap- 
pearance to D. gracilis, but larger; three specimens were found in water 
from a weedy pond along the canal (2). 
Monommata orbis (Muller) (Plate VI, Fig. 14). This includes Furcu- 
laria longiseta and Furcularia aequalis of Pludson and Gosse;® both varie- 
ties were found near the mouth of the canal (2). 
Dicranophorus forcipatus (Muller) (Plate VI, Fig. 15). Found only 
near the mouth of the canal (2) ; one specimen. 
Epiphanes brachionus (Ehrenberg) (Plate VI, Fig. 16). Found in a 
stagnant pool near the north end of Lake Okoboji (10) ; one specimen. 
Bpiphajtes clavulata (Ehrenberg) (Plate VI, Fig. 17). Collected from 
the same stagnant pool with B. brachionus] two specimens of this were 
found. 
Bpiphanes senta (Muller) (Plate VI, Fig. 18). Nine specimens were 
found in the canal (2), and five in the sand-bar pond (3). The species 
was found once among red Buglenae, the large stomach of the rotifer 
being colored red by them; when a specimen is found among green 
Buglenae, the stomach is green. 
Microcodon clavus Ehrenberg (Plate VI, Fig. 19). Two specimens 
were found at different times in water from the canal (2) ; this is the 
only place it wasi found. It can be recognized by the brilliant purple 
pigment spot in the head, the eye. 
Mikrocodides chlaena (Gosse) (Plate VI, Fig. 20). Two specimens 
were found among weeds in a marshy pool near Manhattan (14). 
Mikrocodides robustus (Glasscott) (Plate VI, Fig. 21). Three speci- 
mens were found with M. chlaena, in a weedy, marshy pool (14). 
Brachionus ang^laris Gosse (Plate VI, Fig. 22). Abundant in kettle 
6 Hudson and Gosse, The Rotifera, volume II, p. 46, plate XVIII, figures 15 and 16. 
