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316 GEOL. AND NAT. HIST. SURVEY OF MINNESOTA. 
Erpetocypris barbatus (Forbes. ) 
PLATE LXXVII. 
1879.— Candona ornata (?) C. L. Herrick (83), p. 113; Pl. XX, Fig. 1. 
1893.—Cypris barbatus 8. A. Forbes (67a), pp. 244-246; Pl. XX XVII, Figs. 2-3; Pl. 
XXXVIII. 
This, which is probably the largest freshwater ostracode, is known 
to me only through the paper of Professor 8. A. Forbes. The follow- 
ing description, as well as the figures, is copied from his paper. 
‘‘An extremely large, very hairy, oblong Cypris, with rounded ends 
and dorsal and ventral margins nearly parallel. Length 4.0 mm. 
Width 1.6mm. Depth 2.0 mm. A very little deepest at hind end 
of hinge margin. (Depth across eye 95 per cent of greatest depth. ) 
‘Dorsal margin about straight for a great part of its length, the 
ventral margin very slightly emarginate or sinuate at its anterior 
third. The anterior end broadly and smoothly rounded, more 
obliquely above than below, the posterior somewhat obliquely 
rounded, the ventral margin being thus nearly half as long again as 
the dorsal. Seen from above the shape is symmetrical, a slender oval, 
a little more flattened at the sides behind than before; thickest, con- 
sequently, before the middle. 
**Color a dirty yellowish brown in alcohol, with a reddish-brown 
patch on either side above and behind the middle. Surface of valves 
opaque, very minutely roughened, and well covered with conspicuous 
hairs, which give this Cypris [ Erpetocypris] a decidedly hairy appear- 
ance to the naked eye. Hairs longest before and behind and length- 
ening generally towards the margin, where they project as a fringe, 
the most prominent part of which is a row of hairs borne on slender 
conical tubercles within the margin of the valves, The valves are 
equal and the shell fairly full, but not plump. 
‘‘Anterior antenna with the basal segment obliquely channeled, 
partially dividing it into two, the distal part of which bears a single 
bristle on its superior surface, and two long, more slender ones, 
springing together from tip of the ventral surface. A short, subquad- 
rate second segment bears a single seta, about as long as the segment, 
on the dorsal surface, near the tip. From the distal end of the fol- 
lowing segment spring two long, slightly plumose sete, one dorsal, 
one ventral, the former much the longer. The fourth segment bears 
at its tip four long sete, two of which arise from the ventral angle and 
two from the outer dorsal. The following segment is similarly armed, 
and the distal extremities of the sixth and seventh are densely set 
with long plumose seté forming a stout fascicle, which extends beyond 
the end of the antenna a distance equal to the length of the antenna 
itself. 
