(After Dawson.)]
Amongst the _Annelides_ it is only necessary to notice the little
spiral tubes of _Spirorbis Carbonarius_ (fig. 120), which are
commonly found attached to the leaves or stems of the Coal-plants.
This fact shows that though the modern species of _Spirorbis_
are inhabitants of the sea, these old representatives of the
genus must have been capable of living in the brackish waters
of lagoons and estuaries.
[Illustration: Fig. 121.--_Prestwichia rotundata_, a Limuloid
Crustacean. Coal-measures, Britain. (After Henry Woodward.)]
[Illustration: Fig. 122.--Crustaceans of the Carboniferous Rocks.
a, _Phillipsia seminifera_, of the natural size--Mountain Limestone,
Europe; b, One valve of the shell of _Estheria tenella_, of the
natural size and enlarged--Coal-measures, Europe; c, Bivalved
shell of _Entomoconchus Scouleri_, of the natural size--Mountain
Limestone, Europe; d, _Dithyrocaris Scouleri_, reduced in
size--Mountain Limestone, Ireland; e, _Paloeocaris typus_, slightly
enlarged--Coal-measures, North America; f, _Anthrapaloemon gracilis_,
of the natural size--Coal-measures, North America. (After De
Koninck, M'Coy, Rupert Jones, and Meek and Worthen.)]
The _Crustaceans_ of the Carboniferous rocks are numerous, and
belong partly to structural types with which we are already familiar,
and partly to higher groups which come into existence here for the
first time.
Pages:
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282