PART I CHAZYAN AND RELATED BRACHIOPODS—COOPER xiii 
50. Atelelasma, Cyrtonotella, Desmorthis, Eremotoechia, Glyptorthis, Hesperorthis, Ptycho- 
pleurella. 
51-54. Hesperorthis. 
55. Scaphorthis. 
56. Multicostella, Productorthis. 
57-59. Dinorthis. 
60. Multicostella. 
61. Chaulistomella, Dinorthis, Multicostella. 
62. Multicostella. 
63, 64. Chaulistomella, Multicostella. 
65. Chaulistomella, Dinorthis. 
66, 67. Chaulistomella. 
68. Campylorthis, Chaulistomella, Multicostella. 
69. Campylorthis, Chaulistomella. 
70. Chaulistomella, Valcourea. 
71. Camerella, Chaulistomella, Dinorthis, Multicostella, Plectorthis, Valcourea. 
72. Chaulistomella, Dinorthis, Valcourea. 
73-75. Valcourea. 
76. Chaulistomella, Valcourea. 
77. Eremotoechia, Tritoechia. 
78. Anomalorthis, Atelelasma, Eremotoechia. 
79. Atelelasma. 
80. Atelelasma, Kullervo. 
81. Atelelasma, Plectorthis. 
82. Atelelasma, Cyrtonotella, Hesperorthis, Orthambonites, Pionodema, Productorthis, Pty- 
chopleurella. 
83. Desmorthis, Plectorthis. 
84. Plectorthis. 
85-91. Mimella. 
92. Doleroides, Mimella, Plectorthis, Skenidioides. 
93-96. Doleroides. 
97, 98. Skenidioides. 
99. Ancistrorhyncha, Elasmothyris, Eremotoechia, Genus and species undet., Kullervo, 
Mimella, Onychoplecia, Oxoplecia, Skenidioides, Tropidothyris. 
100. Onychoplecia, Oxoplecia, Triplesia. 
101-105. Oxoplecia. 
106. Camerella, Oxoplecia, Parastrophina, Porambonites. 
107. Porambonites, Salonia. 
108. Camerella, Glyptorthis, Idiospira, Oxoplecia, Perimecocoelia, Porambonites, Taphrorthis. 
109. Camerella, Idiostrophia, Rhysostrophia. 
110. Camerella, Liricamera. 
111. Camerella, Perimecocoelia, Stenocamara. 
112. Camerella, Rhysostrophia. 
113. Camerella, Idiostrophia. 
114. Camerella, Perimecocoelia. 
115. Camerella, Parallelelasma, Stenocamara. 
116. Camerella. 
117. Camerella, Parastrophina, Perimecocoelia. 
118. Brevicamera, Camerella, Parallelelasma, Parastrophina. 
119. Brevicamera, Parallelelasma, Parastrophina, Perimecocoelia, Protozyga, Stenocamara. 
120. Didymelasma, Neostrophia. 
121. Camerella, Dalmanella, Hesperonomiella, Macrocoelia, Onychoplecia, Parallelelasma, 
Triplesia. 
122. Liricamera, Plectocamara. 
