320 GEOL. AND NAT. HIST. SURVEY OF MINNESOTA. 



Cypris fiiscata Jurine. 



Plates LXXI, Figs. 41-46; LXXII, Figs. 7-7p; LXXVI, Fig. 9. 



1820.— Ci/prisfuscata Jurine (98), p. 174; PI. XIX, Figs. 1-2, 



1837.—? " adusia Koch (102), H. II, 3. 



1838.— " galbinea Koch (102), H. XXI, 19. 



1844.— " fuscata Zaddach (231), p. 32. 



1850.— " fusca Baird (5), p. 154; Taf. XIX, Fig. 7. 



1850.— Candona hispida Baird (5), p. 161; Taf. XIX, Fig. 4. 



\8hZ—Cyprh fuscata Lilljeborg (118), p. 114; Pi. X, Figs. 6-9; PI. XII, Fig. 5. 



1868.— 



1887.— 



1838.— 



1889.- 



1891.— 



1894.— 



1894.— 



fusca Brady (18), p. 362; PI. XXIII, Figs. 10-15. 



dugesiC. L. Herrick (86), p. 26; PI. IV, Fig. 7. 



fusca Sostaric (202), p. 47. 



fuscata Brady and Norman (31), p. 73; PI. XII, Figs. 3-4. 



fuscata Wenzel Vavra (221), pp. 98-99, Figs. 33, 33^-33^ 



fuscata C. H. Tamer (215), pp. 16-17; PI. VII, Figs. 41-46. 



fuscata C. H. Turner (216). 



Length of the female 1.40 mm. to 1.50 mm. Height 0.9 mm. 

 Width 0.(57 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 sette of the antennae 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. 



