OF DENISON UNIVERSITY. 55 



above. Both segments extend dorsally into prominences which only 

 appear when the animal is viewed from the side. The head is cov- 

 ered by a thin semi- circular shield, which is slightly arched. The cilia 

 of the disc are feeble, but the sensory tube is distinctly seen. The 

 first joint of the foot is quadrate, the two following being of equal 

 length but different diameter. The claws are ovate lanceolate and 

 short. The accessory spine is awl-shaped and shorter than the claws. 

 The length is about .10 mm. Eckstein gives very good and accurate 

 figures of this species, his description of the viscera is also valuable. , 

 The following species of this genus are known : S. lameller i s , 

 Ehr. with three spines behind. ^. cirratus, Ehr. with two spines 

 behind. S. lofigispinatus^TaX. S. ovalis.^chxn. S. tridentatus,Yr. 



GENUS BRACHIONUS, Ehr. 



A large genus containing curiously armed and ornamented species. The body 

 is depressed, oval or quadrate in outline, presenting a very large anterior opening 

 always guarded by spines or teeth. Behind, the shell may be rounded or armed 

 with spines like those in front. There is only a small opening upon the ventral 

 aspect through which extends the foot. The ventral surface of the body is gener- 

 ally plane while the back is arched and may be set off into areas by elevated lines. 

 The maxtax is prismatic and complicated. The egg is carried about attached to 

 the body of the parent, as in Aniircea. The males are said not to be rare in this 

 genus. 



Brachionus bakeri, Ehr. 



A single gathering taken in Granville, O., in September, contained 

 a species belonging in the section of this genus characterized by the 

 multiarticulate foot. 



Our species is sub-quadrate in outline and more or less expanded 

 back of the middle. The whole length, including spines, is from .30 

 to .40 mm. for adult females. The oral margin, above, is produced 

 into six spines. The median pair are longest and curve decidedly 

 outward and may be from .05 to .08 mm. long ; between them is an 

 incision, through which ordinarily projects the sensory tube. The 

 outer pair of spines are half as long and also curve outward. Mid- 

 way between these pairs is a short spine or tooth. The ventral edge 

 is notched in the middle, but not toothed. The width of the body 

 is from .18 to .22 mm. The posterior portion of the shell extends 

 into two pairs of spines, of which the outermost are very long (.10- 

 .14 mm. ) and project directly backward or slightly outward or are uni- 

 formly curved- The inner pair of spines immediately border the 



