. 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 . 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
. 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 . 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 antennaeand mandibles. MINNESOTA CRUSTACEA. i^i^ Annual Report PLATE M. Geol & Nat. Hist. Sur. PLATE N. Fig. 1-4. Daphnia jmlex, var. nasutiis. Fig. 5. outliue of head and (a) beak of D. similis. Fig. 6. Leptodora hyalina, seen from above. Fig. 7. larva. Fig. 8. Latona setifera, female. Fig. 9. Limnosida frontosa^ female. Fig. 10. auteunule of male. Fig. 11. Holopedium gibherum, female. Fig. 12. Sida elongata, head outline. Fig. 13. Sida cnjstallina, head outline of young female. Fig. 14. antennule of male. Fig. 15. of female. Fig. 16. Daphnia galeata, outline of head. Fig. IT. vitrea MINNESOTA CRUSTACEA. 12 OCAnnualRr^port JlLATE N. ^^^^ &J^6imst. Sur. Minn.
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