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. lamellei'is^ 
Ehr. with three spines behind. S. cii^ratus^ Ehr. with two .spines 
behind. S. longispinatus.T?^. S. ovalis,^c:\\m. S. tridcntatus^Yx. 
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 A/iurcea. The males are said not to be rare in this 
genus. 
BrACHIONUS BAKERl, 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 
