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Transactions of the Wisconsin Academy of Sciences, Arts and Letters
volume VIII (1888-1891)

Birge, Edward A.
List of crustacea Cladocera from Madison, Wisconsin ,   pp. 379-Plate XIII ff. PDF (7.9 MB)


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398       Wisconsin Academy of Sciences, Arts and Letters.
mals can be gathered from a long distance, before the dredge fills. The
cone not only excludes weeds but also keeps out insects, larvae, large
Gammari, etc., which so abound in localities favorable for Cladocera, and
whose size and activity made it difficult to distinguish the smaller crms-
tacea in the collector's jar. The fact that this dredge can be pulled
through weeds and strain a large quantity of water without obtaining
a large amount of vegetable debris makes it very valuable in obtaining
the rarer Cladocera.
  The dredge is emptied by unscrewing the screw-cap and washing out the
contents of the bag into a tumbler or small jar of water. In collecting
near home this is brought to the laboratory for study. When it is deo
sired to preserve collections for future study, the water is allowed to
stand and settle for a short time and then the clear water containing the
animals and free from mud is poured through a funnel into a small bag
of cheese-cloth which is tied and put into alcohol or other preserving
fluid.
  With this dredge it is not at all difficult to collect 20-30 species of
Cladocera from one locality and in a few hauls. In a collection thus
gathered from the shore on a flying trip to some small lakelets at Man-
istee, Mich., I found twenty-six species of littoral Cladocera. Zacharias*
in a summer's campaign in North German lakes found only twenty-three
species from the shore waters.
                             PLATE XIII.
Fig. 1. Latonopsis occidentalis, Birge. Head of male, enlarged 60 diameters.
Fig. 2.                            Head of young female, enlarged 50 diameters.
Fig. 3.                            Post-abdomen of male, enlarged 75 diameters.
                                      The spines of the carapace are omitted.
Fig. 4.                            Antennule of new-hatched male, enlarged
200
                                      diameters.
Fig. 5.                            First leg of male, enlarged 175 diameters.
Fig. 6. Latona setifera, C. F. M. Male antennule to show position of appendix
cili-
                                  ata (a). Enlarged 200 diameters.
Fig. 7. Daphnia retrocurva, Forbes. Male antennule, enlarged 200 diameters.
Fig. 8.   "        "             Female, enlarged 30 diameters.
Fig. 9.   "    hyalina, Leyd. Male antennule, enlarged 200 diameters.
Fig. 10. Ophryoxus gracilis, Sars. Head of male, enlarged 65 diameters.
Fig. 11.   "       "          Post-abdomen of male, enlarged
160
diameters.
Fig. 12.   "       "          Part of first leg of male,
enlarged
200 diameters.
Fig. 13. Macrothrix rosea, Jur. Antennule of male, enlarged 240 diameters.
Fig. 14.   "      "         Post-abdomen of male, enlarged
240
diameters.
Fig. 15. Drepanothrix dentata, Eur. Post-abdomen of male, enlarged 175 diameters.
Fig. 16.    "         "         Female, enlarged 65 diameters.
Fig. 17.     "        "          First leg of male, enlarged
300
diameters.
Fig. 18. Ilyocryptus longiremis, Sars. Male, enlarged 100 diameters. The
spines of the
                                    carapace are omitted where they would
cross
                                    the post-abdomen.
Fig. 19. Alona lepida, Birge. Cast shell to show markings, enlarged 60 diameters.
Fig. 20. Dunhevedia setiger, Birge. Male, enlarged 115 diameters.
Fig. 21. Pleuroxus denticulatus, Birge. Post-abdomen of male, enlarged 165
diameters.
* Zacharias, 0. Zur Kenntniss der pelagischen und littoralen Fauna Norddeutschen
Seen.
Zeit. Wiss. Zool. Vol XLV, 1887., p. 265.
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