. A final report on the Crustacea of Minnesota, included in the orders Cladocera and Copepoda, together with a synopsis of the described species in North America, and keys to the known species of the more important genera . Q^ti^rrxcK, PLATE L. :Fig. Fig. :Fig. Wig:. 1. 5. 7. iFig. 8. Daphnia minnehaha, young female. head of female; 2a. post-abdomen. hi/alina, young female. young. , young. older female. MINNESOTA CRUSJACEA 12thAnnualReport PLATE L,. Gcnl &Xai HistSur. ^ CJ-Ht-rru:^ PLATE M. ] Fig. 1. Daphnia schceferi, post-abdomen of female. Fig. 2. - mal
. A final report on the Crustacea of Minnesota, included in the orders Cladocera and Copepoda, together with a synopsis of the described species in North America, and keys to the known species of the more important genera . Q^ti^rrxcK, PLATE L. :Fig. Fig. :Fig. Wig:. 1. 5. 7. iFig. 8. Daphnia minnehaha, young female. head of female; 2a. post-abdomen. hi/alina, young female. young. , young. older female. MINNESOTA CRUSJACEA 12thAnnualReport PLATE L,. Gcnl &Xai HistSur. ^ CJ-Ht-rru:^ PLATE M. ] Fig. 1. Daphnia schceferi, post-abdomen of female. Fig. 2. - male. Fig. 3. male antennule. Fig. 4. brain and nerves. inf. ce. g. infra-oesophagal ganglion with nerves to anten-nae; ce. oesophagus; n f. frontal nerve; g. opt. optic gang-lion; ra. opt. muscles which move the eye; p. f. pigmentfleck; n. opt. optic nerve. Fig. 5. Daphnia schafferi, posterior part of embryo. - Fig. 6, Eiirycercus lamellatus, heart, showing the anterior bifid portion between the lobes of which is the arterial openingand valve. The vaned arrows represent deeper currentswhile the unvaned indicate superficial ones^ The dottedline represents the position of the pulsating membraneseparating the venous from the arterial currents and seenin section at (a). - Fig. 7. Daphnia similis, anterior part of the nervous system seen from below, a. optic nerve; b. optic ganglion; c. Irontalnerve; d. nerve to antennules; e. commissure connectingupper and lower oesophagal ganglion; f. nerves to antennaea
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Keywords: ., bookcentury1800, bookdecade1880, bookidfinalreporto, bookyear1884
