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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)

Page 394

394      Wisconsin Academy of Sciences, Arts and, Letters.
which is sharp. Eye moderate in size, showing four or fewer lenses-
Macula nigra about as large as eye, angular, and somewhat nearer to eye,
than to apex of rostrum.
Post-abdomen enlarged posteriorly, lower angle rounded, bearing 15-iT
serrate post-anal denticles and about the same number of squamae. Ter-
minal claws smooth. Basal spine rather large. Abdominal set~e of ordi-
nary length.
  Antennule cylindrical,with anterior sense-bristle and flagellum. Post-
abdomen devoid of denticles and with a row of squamae. |Vas deferens
opens in front of terminal claw. Basal spine large.
  Color yellowish to bright yellow, fairly trans-parent. Lake Mendota,
in deeper water, 15o20 feet.
  This species is evidently related to A. elegans, Kurz * from which it
differs in its greater size, in the reticulation of part of the shell, and:
in the size, shape and armature of the post-abdomen. The post-abdomein
of A. lepida resembles in general that of A. quadrangularis, 0. F. M.
The species lives at the bottom in rather deep water -15-20 or more
feet - and is much more abundant in Lake M.endota than elsewhere iii
the vicini o     ison.
  My species G. inermist is a variety of this sBsecies The spine on the,
terminal claw is sometimes, though rarely, present, and the other char-
acters adduced for G. inermis fall within the range of variation of Eu-
ropean forms.
Species 46. DUN      inEVEDIA (CREPIDOCERoUS) SETIGER, Birge. Plate XIO L
  Fig. 20.
  In 1888, G. 0. Sart raised from dried mud and redescribed Datnhevedia
crassa of King. From his description and figures it is plain that mye
genus Crepidocercus is identical with King's Dunhevedia, which was estab-
lished in 1853. The genus was named by King from Dunheved, the
place where the animal was found. My species differs from D. erassa,
King, in the reticulation of the shell and, apparently, from D. hpodagra,
King, in general form. I have not been able to see King's original pa-
per. D. setiger has been found in Hungary by Daday.ß
  In the latter part of August I found the males of this -species. D. setiger
has always been one of the rarest species of Cladocera here. It was
rarely collected at all, and if present in a dredging was found in only
*Kurz, W. Dodekas neuer Cladoceren. Sitzb. der K. Akad. der Wissensch. Wien;
1874. Separate reprint, p. 43. Description of female, Tab. a, fig. 1, female.
t Transactions Wis. Acad. Sci., vol. iv, p. 102, pl. I, fig. 17.
p Additional notes on Aust. Cladocera, 1888, p. 41, PI. 5, figs. 1-4.
hDaday, E. Crustacea Cladocera Faunh Hungaricae. p. 93, P1. I, fig. 47-48.

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