SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 57 



PAGE 



Limulava Walcott, synonymy of 205 



classification of 155 



foreshadowed by Burgess shale fauna 165 



intermediate between Aglaspina and Eurypterida 163 



Lipalian time, inception of five main lines in 161 



Louisella pednnculata, stratigraphic position and association 153 



Lower Cambrian, genera that occur in 155 



Nevadia in 1 57 



Lower Carboniferous strata, fresh-water shells in 166 



Mackenzia costalis, stratigraphic position and association 153 



Malacostraca, subclass 148, 153, 182 



classification of 154 



compared with Waptidse 180 



descent of 160-161 



foreshadowed by Burgess shale fauna 165 



relations of, to Branchiopoda, Leptostraca, Trilobita, and Meros- 



tomata 163 



segmentation, table of 158 



mentioned 155 



Malacostracans, group of, exceptions in vertical range noted 155 



bivalve carapace of 157 



Mandibles, Branchiopoda, and Malacostraca 159 



Marr, Dr. John E, Marrella named in recognition of 192 



Marrella, iiczv genus, discussed 192 



antennules (?) of 157 



carapace of 157 



classification of 154 



dorsal spines of 157 



foreshadowing the trilobite 163 



labrum of 158 



stratigraphic position and association 153 



swimming exopodites of 160 



Mnrrella splendcns, new species 193, pi. 25, figs. 1-6, pi. 26, figs. 1-6 



appendages 193 



Apus-Wkt form of ; 162 



compared with Apus and Lepidiirus 192 



compared with the Trilobita (footnote) 162 



epipodite and protopodite of 159 



interior structure 193 



stratigraphic position and association 153 



mentioned 149, 151, 152 



Marrellidse, new family, described 192 



classification of 154 



Maxillae, Branchiopoda and Malacostraca 159 



Maxillulas, Branchiopoda and Malacostraca 159 



media, see Opabinia. 



Medusae, second paper, mentioned 148 



