. Bulletin - United States National Museum. Science. 338 BULLETIN" 15 8, tJKlTED STATES NATIONAL MUSEUM KEIY TO THE SPECIES (FEMALES) 1. Outer margin of caudal rami coarsely toothed, the teeth increas- ing in length distally; outer seta close to tip agilis (p. 338) Outer margin of caudal rami smooth, without teeth; outer seta near center of outer margin prasinus (p. 339) EUCYCLOPS AGILIS (Koch) FiGUBE 201 Cyclops agilis Koch, Deutschlands Crustaceen, Myriapoden und Arachniden, pt. 21, pi. 3, 1838. Leptocyclops agilis Sars, Crustacea of Norway, vol. 6, p. 71, pi. 43, 1914. Occurrence.—Foun
. Bulletin - United States National Museum. Science. 338 BULLETIN" 15 8, tJKlTED STATES NATIONAL MUSEUM KEIY TO THE SPECIES (FEMALES) 1. Outer margin of caudal rami coarsely toothed, the teeth increas- ing in length distally; outer seta close to tip agilis (p. 338) Outer margin of caudal rami smooth, without teeth; outer seta near center of outer margin prasinus (p. 339) EUCYCLOPS AGILIS (Koch) FiGUBE 201 Cyclops agilis Koch, Deutschlands Crustaceen, Myriapoden und Arachniden, pt. 21, pi. 3, 1838. Leptocyclops agilis Sars, Crustacea of Norway, vol. 6, p. 71, pi. 43, 1914. Occurrence.—Found in greater or less abundance in all the fresh- water ponds in and around Woods Hole and along Cape Cod to Chatham, in Edgartown Great Pond and two small ponds on Marthas Vineyard, and in most of the fresh-water ponds on the Eliza- beth Islands. Color.—Body dark olive-green, banded across the thorax, the genital segment and the bases of the caudal rami with reddish brown. Eye bright red. Eggs light bluish white. Distribution.—Europe; central and northern Asia; Algeria; Azores; polar islands north of Grinnell Land; North Amer- ica; Australia; New Zealand (Brady); Nantucket Island (Pearse); Khode Island (Wil- liams). Female.—Metasome elliptical, width slightly more than half the length; urosome less than half the length of the metasome; genital segment as long as the first two abdominal segments combined; caudal rami twice the length of the anal segment, curved slightly outward, their outer margins denticulate, the teeth increasing in size distally, the outer seta close to the tip of the ramus. First antennae reaching the distal end of the second metasome segment, the last three segments with a smooth lateral membrane. Outer spines on first four exopods 3, 4, 4, 3; inner spine of fifth leg as long as outer one and coarsely dentate. Anterior portion of semen receptacle transversely elliptical and slightly emarginate at the center; posterior portion also emarginate at the
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Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
