464 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 53 



PAGE 



Mesonacis {OleneUiis) asaphoides Peach, in synonymy 271 



Metadoxides inagaificus ? Grabau, in synonymy. 284 



micans, see Hyolithellus. 



Mickwitz, A., bibliographic references 113, 162 



Mickwitaella, see Obolus {Mickwitsella) . 



mickwitsi, see Mesonacis, Olenellus, Olenellus (Mesonacis), Schmidtia, and 

 Schmidtiellus. 



Mickwitda, classification of 142, 143 



evolution of pi. n (pp. 140-141) 



mentioned 54 



monilifera, compared with Mickxvitzia prctiosa 55 



occidens, new species 54, pi. 7, fig. i 



compared with Mickwitzia pretiosa 54 



stratigraphic position and association 187 



pretiosa, new species 54, pi. 7, fig. 2 



compared with Mickivitzia monilifera 55 



Mickzvitzia occidens 54 



Microdiscus, mentioned 102, 348 



stratigraphic position and association 199, 212, 214 



Micromitra, classification of 142, 1.43 



compared with Acrothele woodworthi 88 



evolution of pi. 11 (pp. 140-141) 



mentioned 55 



Microniitra haydeni, new species 55, pi. 7, figs. 3 and 3a 



compared with Micromitra sculptilis 55, 56 



stratigraphic position and association 198 



Micromitra nisus, mentioned 279 



Micromitra pealei, compared with Micromitra (IphideUa) Ionise 56 



Micromitra sculptilis, compared with Micromitra haydeni 55, 56 



compared with Micromitra sculptilis endlichi 56 



stratigraphic position and association 179, 180, 194, 195 



Micromitra sculptilis endlichi, new variety, characterized, not figured.... 56 



compared with Micromitra sculptilis 56 



Micromitra (Ipliidella) , classification of 142, 143 



evolution of pi. 11 (pp. 140-141) 



mentioned 56 



Micromitra (Iphidella) Ionise, new species 56, pi. 7, figs. 4 and 4a 



associated fossils listed 57 



compared with Micromitra (Iphidella) Ionise ■ 56 



Micromitra (Iphidella) nyssa 56 



Micromitra {I phidella) pannnla 56 



Micromitra (Iphidella) panmila v.ialadeits'.s 56 



stratigraphic position and association 216 



Micromitra {Iphidella) nyssa, new species ■ 57> pl- 7, fig. 5 



compared with Micromitra (Iphidella) Ionise 56 



Micromitra (Iphidella) ornatella 57 



Micromitra (Iphidella) pannnla 57 



Micromitra (Paterina) labradorica 57 



Micromitra (Paterina) zcapta 59 



