A. E. Verrill—North American Fresh-water Leeches. 181 
rous, forming a single median row anteriorly, which becomes 
double posteriorly, where there is also a row on each side, mid- 
way between it and the margin. The general color above is 
Lower surface lighter. 
Variety c. One specimen, perhaps distinct, has the ocelli 
united into a single spot, and the back covered with numerous 
small, scattered papilla. The color was not recorded. 
Section B. Four ocelli. 
No American species belonging to this section are known to 
me. 
Section C. Six ocelli. 
Sub-section a. Back smooth. 
Clepsine pallida, sp. nov. Figure 8, a; head enlarged. 
Body depressed, broad and obtusely rounded posteriorly, 
tapering, but not very slender, anteriorly ; about 1 inch long 
an 1 b i a Fig. 
tracti 
Yellowish with scattered blackish specks and with a m 
ight line, interrupted by a row of nt, small, black spots. 
Beneath pale flesh-color. : 
West River, with the preceding,—A. E. Verrill. 
