320 GEOL. AND NAT. HIST. SURVEY OF MINNESOTA. 
Cypris fuscata Jurine. 
Puiatrs LXXI, Fias. 41-46; LX XII, Fies. 7-7p; LX XVI, Fie. 9. 
1820.— Cypris fuscata Jurine (98), p. 174; Pl. XIX, Figs. 1-2. 
1837.—? ‘‘ adusta Koch (102), H. IT, 3. 
1838.— ‘ galbinea Koch (102), H. XXI, 19. 
1844.— ‘‘ fuseata Zaddach (234), p. 32. 
1850.— ‘‘  fusea Baird (5), p. 154; Taf. XIX, Fig. 7. 
1850.—Candona hispida Baird (5), p. 161; Taf. XIX, Fig. 4. 
1853.—Cypris fuscata Lilljeborg (118), p. 114; Pl. X, Figs. 6-9; Pl. XII, Fig. 5. 
1868.— ‘ fusca Brady (18), p. 362; Pl. XXIII, Figs. 10-15. 
1887.— ‘* dugesiC. L. Herrick (86), p. 26; Pl. IV, Fig. 7. 
1888.— ‘‘ fusca Sostaric (202), p. 47. 
1889.— ‘‘  fuscata Brady and Norman (31), p. 73; Pl. XII, Figs. 3-4. 
1891.— ‘‘ fuscata Wenzel Vavra (221), pp. 98-99, Figs. 83, 33!-33°. 
1894.— ‘ fuscata C. H. Turner (215), pp. 16-17; Pl. VII, Figs. 41-46. 
1894.— ‘*  fuscata C. H. Turner (216). ; 
Length of the female 1.40 mm. to 1.50 mm. Height 0.9 mm. 
Width 0.67 mm. to 0.73 mm. 
The greatest height of the animal is about two-thirds of the 
length, while the greatest width is less than the height. The color is 
greenish brown. ‘The shell usually has attached to it furfaceous mat- 
ter, which Professor Brady thinks is desquamating epidermis. 
Viewed from the side the cephalic third of the shell is wider than 
any other portion. The caudal, dorsal and cephalic borders are con- 
vex. The cephalic and caudal margins have a narrow hyaline edge. 
The valves are not very transparent and are covered with short, scat- 
tered hairs. Muscle impressions near centre of the valve, about 
seven. 
Viewed from above the shell is oval, rounded behind and bluntly 
pointed in front. The greatest height is in the middle. 
The natatory sete of the antenne extend to the tips of the terminal 
claws. The terminal claws are stout, curved and longer than the last 
two joints. The distal half of the inner margin of each claw is pecti- 
nated with a double row of fine teeth. 
The two enlarged spines upon the first mandibular process are 
toothed. The extremity of each spine and the two adjacent teeth are 
blunt. 
The first foot is five-jointed, the third and fourth joints being dis- 
tinct. The terminal claw is long and stout, longer than the combined 
lengths of the last three joints. The second joint is stout and about 
as long as the combined lengths of the next two joints. 
The terminal claw of the second foot (Fig. 43) is about twice as 
long as the terminal joint. 
