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ENTOMOSTRACA OF MINNESOTA. 325 
distance, this band forms a convex curve and passes caudo-dorsad 
almost to the margin of the shell. From the caudo-dorsal angle of the 
square a short band passes dorso caudad and fuses with a broader band 
which passes caudad, approximately parallel to the dorsal margin of 
the shell. From this same corner another band passes caudo-ventrad 
almost to the caudal margin of the shell. This band is approximately 
parallel to the band just described. From the caudo-ventral angle of 
the square a band passes caudo-ventrad almost to the caudo-ventral 
extremity of the shell. In the caudal portion of its course this band 
curves dorsad, otherwise it is approximately parallel to the band last 
described. From the cephalo-ventral angle of the square, a short band 
projects ventrad and then broadening, forms a boot-shape band. The 
short heel of this boot projects caudad and terminates in a point, the 
long toe extends cephalad and terminates bluntly. From the same 
corner of the square, a second band projects cephalad to about the 
level of the toe of the boot. There it fuses with a spike-shaped band 
which extends cephalo-ventrad from near the cephalo-dorsal angle of 
the square to about the cephalo-ventral extremity of the shell. The 
head of the spike is at the caudo-dorsal extremity of the band. The 
two bands fuse near the head. 
The number of lucid spots is about eight. They are situated in the 
centre of the valve and ordinarily are inclosed within the square above 
described. 
Viewed from the ventral surface one valve overlaps the other in 
front. The contact line is sinuous, being laterally convex at the mid- 
dle. 
Viewed from the end the shell is oval in shape, the greatest width 
being near the dorsal surface. 
Antenne slender; the natatory sete on the distal extremity of the 
third joint reach almost or quite to the tip of the long and slender 
terminal claws. 
The mandible is stout. Among other sete, the antepenultimate 
joint of mandibular palp bears a short, pectinated, dagger-shape seta; 
so does the penultimate joint. 
The two biarticulate claws on the first mandibular process of the 
first maxilla are smooth. ‘The extremity of that same process bears 
two sete as long as the biarticulate claws; one, which is curved and 
smooth, is situated at the outer angle and the other, which is straight 
and pectinated, is situated about the middle of the extremity. 
The terminal claw of the first leg is almost as long as the entire 
dimb. The distal two-thirds is pectinated. 
The post-abdomen is long, slender and straight. The distal portion 
-of its outer margin is pectinated. The terminal claws are curved and 
-are a little longer than half the length of the abdominal rami. 
MON 
