X CONTENTS 



Part IV. The genera of the suborder Orthoidea — Cont. Page 



Superfamily Clitambonacea 107 



Family Deltatretida: 107 



Deltatreta 108 



Pomatotrema Ulrich and Cooper, nov 109 



P. muralis Ulrich and Cooper, nov 109 



Polytoechia 110 



Family Clitambonitidx 110 



Subfamily Plectellinae 112 



Plectella 112 



Ingrla 112 



Subfamily Clitambonitins 113 



Clitambonites 113 



Vellamo 114 



Clinambon, nov 115 



Estlandia 115 



Hemifronites 115 



Pahlenella 117 



Afomatella 117 



Subfamily Gonambonitinas 118 



Gonambonites 11° 



Superfamily Dalmanellacea H' 



Family Dalmanellidas 11° 



Dalmanella 120 



Carinijerella 1^2 



Aulacella 122 



Proschixofhoria *2j 



Levenea ^^^ 



Heterorthina 124 



Family Wattsellidae 124 



Wattsella 125 



Resserella 126 



Horderleyella 1^7 



Mendacella ^^' 



Idiorthis 128 



Parmorthis ^2o 



P. crassicostata, nov 129 



Fascicostella ^29 



Family Bilobitidae 1^0 



Bilobites 130 



Family Mystrophoridae 1-^1 



Mystrophora '-^^ 



Kayserella l-'^ 



Family Rhipidomellidae ^•'•^ 



Rhifidomella '•'■' 



Perdkocardtma '•'-' 



Platyorthis 1^^ 



Thiemella 1^^ 



Family Heterorthidas '•^" 



Subfamily Heterorthinae j;;' 



Heterorthh 1-^' 



Subfamily Harknessellinae J;;^ 



Harknessella |^° 



Reuschella |^^ 



Smeathenella 



