. Bulletin - New York State Museum. ssed line runs from the pos-terior lateral angles of the headacross all the segments to thepleon. Pleon consisting of asingle piece pointed at the and antennae short. Length 6 mm, breadth Color uniform, dull. Found under stones or creep-ing over the bottoms or amidstand beneath the decaying vege-table matter in sheltered situations. Taken on eastern shore of Staten Island. 4 ASELLOTASegments of pleon fused into a shieldlike plate. Pleopoda ex-clusively branchial and reduced in number. Uropoda terminal as inChelifera and biramous. Antenn

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. Bulletin - New York State Museum. ssed line runs from the pos-terior lateral angles of the headacross all the segments to thepleon. Pleon consisting of asingle piece pointed at the and antennae short. Length 6 mm, breadth Color uniform, dull. Found under stones or creep-ing over the bottoms or amidstand beneath the decaying vege-table matter in sheltered situations. Taken on eastern shore of Staten Island. 4 ASELLOTASegments of pleon fused into a shieldlike plate. Pleopoda ex-clusively branchial and reduced in number. Uropoda terminal as inChelifera and biramous. Antennulae small, antennae sometimesvery large. Five families, two represented. Family ^vsellidaePlainly fresh-water forms, distinguished by the pleopoda, whichnumber in the female four pairs, the first very small and not oper-culiform, the rest biramous, the second pair forming an operculumfor the last two. In the male there are five pairs, an additionalpair, the copulatory appendages, being interposed between the firstand second Fig. 40 Edotea t r i 1 o b a (After Harger) 178 NEW YORK STATE MUSEUM

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Keywords: ., bookcentury1800, bookdecade1880, booksubjectscience, bookyear1887