NO. 6 MIDDLE CAMBRIAN BRANCHIOPODA, ETC. 



PAGE 



IViwaxia cornigata, stratigraphic position and association ••152, 153 



Woodward, Dr. Henry, British Fossil Crustacea 206 



Worthenella cambria, stratigraphic position and association 153 



Xiphosura, referred to 164 



Yohoia, new genus, discussed 171 



classification of 154 



no living representatives 165 



rami and segmentation 159 



Yohoia plena, new species 173, pi. 29, fig. 14 



compared with Yohoia tenuis 173 



stratigraphic position and association 152 



Yohoia tenuis, new species 172, pi. 29, figs. 7-13 



alimentary canal of 173 



appendages 172-173 



compared with Waptia Heldensis 173 



compared with Yohoia plena 173 



resemblance to Habelia optata 202 



stratigraphic position and association '. 152 



Ziphosuridae, relation to Merostomata 165 



Zoology, Lankester's Treatise on, classification outlined in 153 



