Page:Walcott Cambrian Geology and Paleontology II.djvu/176

110 {| width="100%"
 * valign="top" colspan="3" | Class Gephyrea—Quatrefages
 * valign="bottom" align="right" | 127
 * || valign="top" colspan="2" | Family Ottoidæ, new family
 * valign="bottom" align="right" | 128
 * || || valign="top" | Genus Ottoia, new genus
 * valign="bottom" align="right" | 128
 * || || valign="top" | Ottoia prolifica, new species
 * valign="bottom" align="right" | 128
 * || || valign="top" | Ottoia minor, new species
 * valign="bottom" align="right" | 129
 * || || valign="top" | Ottoia tenuis, new species
 * valign="bottom" align="right" | 130
 * || || valign="top" | Genus Banffia, new genus
 * valign="bottom" align="right" | 130
 * || valign="top" colspan="2" | Banffia constricta, new species
 * valign="bottom" align="right" | 130
 * || valign="top" colspan="2" | Family Pikaidæ, new family
 * valign="bottom" align="right" | 131
 * || || valign="top" | Genus Pikaia, new genus
 * valign="bottom" align="right" | 131
 * || || valign="top" | Pikaia gracilens, new species
 * valign="bottom" align="right" | 132
 * || || valign="top" | Genus Oesia, new genus
 * valign="bottom" align="right" | 132
 * width="20px" |
 * width="20px" |
 * valign="top" | Oesia disjuncta, new species
 * valign="bottom" align="right" | 133
 * }
 * valign="bottom" align="right" | 131
 * || || valign="top" | Pikaia gracilens, new species
 * valign="bottom" align="right" | 132
 * || || valign="top" | Genus Oesia, new genus
 * valign="bottom" align="right" | 132
 * width="20px" |
 * width="20px" |
 * valign="top" | Oesia disjuncta, new species
 * valign="bottom" align="right" | 133
 * }
 * valign="top" | Oesia disjuncta, new species
 * valign="bottom" align="right" | 133
 * }

This is the third paper on Middle Cambrian fossils from the Burgess shale member of the Stephen formation of British Columbia. The first was on the Merostomata and the second on the Holothurians and Medusæ. We now have for consideration the annelids. As a rule the annelids have been known only by trails and borings in the muds and sands deposited in the various periods between the Pre-Cambrian Algonkian and the present, and only under very exceptional conditions have any traces of the actual animal been preserved. The most noted discoveries are those in the Upper Jurassic Solenhofen lithographic shales of Bavaria and the Eocene shales of Monte Bolca. Another discovery that has long escaped the attention of authors is that made by Dr. E. O. Ulrich and described by him in 1879. These fossils appear to be true segmented Polychætous annelids from the Ordovician shale at Cincinnati, Ohio.