ENTOMOSTRACA OF MINNESOTA. 133 
about ten teeth, the upper thick and blunt, the inner sharp, slender 
and longer. Several are notched at tip. The lower angle bears a 
long simple bristle. Mandibular palpus two-jointed, second joint with 
three long terminal hairs and a shorter spine attached at basal third 
of anterior margin, jointed at base and directed towards tip, like a 
dactyl. The maxilla and maxillary palpus are scarcely to be distin- 
guished from those of C. staphylinus. 
‘“The first maxillipeds are three-lobed, the outer lobe constituting 
a long, strong claw. The second and third are about one-third as 
long as the first, and bear each one strong simple spine and one weak 
branched hair. The inner lobe is widest, about two-thirds as wide as 
long. The dactyl of the posterior maxilliped is spinous on its inner 
edge, and the same edge of the hand is ciliate and bears a short, stout, 
sparingly plumose bristle at its base, just beyond the tip of the closed 
dactyl. The width of this joint (the second) is nearly half its length. 
‘*Basal joint of inner ramus of first pair of legs nearly or quite as 
long as outer ramus, the second wider but only half as long as the 
third, and obliquely truncate. Jnner ramus of third pair of legs in 
male is three jointed [the outer two-jointed]*, chelate. The finger is 
ovate, truncate, terminating in two long plumose hairs. The dactyl 
is linear, curved at base, and twice as long as finger. The inner 
ramus of the fourth pair of legs is about half as long as outer, two- 
jointed, basal joint short, terminal joint about as long as middle joint 
of outer ramus. The fifth pair of legs is best developed in the female. 
In the male the length is not over one-third the width. The basal 
portion bears three plumose hairs on its very broadly rounded ante- 
rior margin, of which the innermost is longest. The outer plate is 
nearly orbicular and bears five spines on its terminal margin, of which 
the second from the internal angle is the longest. Genital plates, 
found in male at posterior border of first abdominal segment, beneath, 
are Short, slightly expanded internally, with internal angles rounded, 
and externally bear three subequal bristles, jointed at base, the inner 
largest and strongest and semi plumose. The antennce of the female 
are eight jointed, extending backward to the first free segment. The 
basal joint of the fifth pair of legs is subelliptical in outline, with the 
basal half produced externally into a broad, triangular process which 
bears the second joint on its posterior margin. The free end of the 
basal joint bears six large plumose bristles, of which the inner is long- 
est. The greatest width of the joint is nearly equal to its greatest 
length. The second or outer joint is ovate, subtruncate, spined on 
each margin, and bears four plumose bristles at tip and one at the 
middle of its outer margin. Its length is about twice its breadth.”’ 
* Evidently a misprint, for it is the inner ramus which is chelate. 
