. Fresh-water biology. Freshwater biology. 6S4 FRESH-WATER BIOLOGY 24 (25) Much depressed; papillae numerous; no accessory eyes; size large. Placobdella rugosa (Veriill) 1874. 25 (24) Moderately depressed; papillae less numerous; neural annulus with much dark pigment; several pairs of simple accessory eyes succeeding compound eyes; size medium. Placobdella hollensis (Whitman) 1892. 26 (23) Numerous minute papillae around margin of caudal sucker. Mod- erately depressed; dorsal papillae usually in a median and two paired series, small, acute and pale yeUow or brown; a very conspicuous and consta
. Fresh-water biology. Freshwater biology. 6S4 FRESH-WATER BIOLOGY 24 (25) Much depressed; papillae numerous; no accessory eyes; size large. Placobdella rugosa (Veriill) 1874. 25 (24) Moderately depressed; papillae less numerous; neural annulus with much dark pigment; several pairs of simple accessory eyes succeeding compound eyes; size medium. Placobdella hollensis (Whitman) 1892. 26 (23) Numerous minute papillae around margin of caudal sucker. Mod- erately depressed; dorsal papillae usually in a median and two paired series, small, acute and pale yeUow or brown; a very conspicuous and constant pale band across somite VI; size small Placobdella phalera (Graf) 1899. 27 (14) Eyes four pairs, all simple; gastric ceca nine or ten pairs; saUvary glands diffuse; body very soft and almost oedemous; genital pores at XI-XII and XII a'^/a^; color green with three series of pale yellow spots. On fishes and free in streams. Protoclepsis occidentalis (Verrill) 1874. This leech and others of the genus are noteworthy among the members of their family for their transparency and activity. No other glossiphonids creep with any approach to the same speed and none swim so well. So far as has been observed the eastern species is exclusively sanguivorous, pursuing and attacking frogs and fishes. Nothing is known of the breeding habits beyond the fact that spermatophores are formed and attached to the Fig. 999. Protoclepsis occidentalis. Dorsal view of anterior seven segments, showing annul!, eyes, and sensillae. X 20. (Original.) Complete somites not triannulate 29 Complete somites of two annuli, the anterior much the larger. Sahvary glands compact; gastric ceca seven pairs; epidid- ymis a short, wide, U-shaped sperm-sac; eyes one pair, united; genital pores separated by the large annulus of XII; size small. On salamanders. North Carolina. * Oligobdella biannulata (Moore) 1900. (• Oligobdella noia. nov. for Microbdella Moore preoccupied.) An interesting and little known leech t
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