2 



Explanation of Plate XII. 

 Fig". (Chemung Bracliiopoda.) 



100. Atrypa hystrix. Exfoliated. West Chemung. 



101. Atrypa aspera, var. Eastern and western Chemung. 



1 02. Produdella lachrymosa. Chemung, especially western. 



103. " " var. stigmata, W. Chemung. 



104. " " Imprint of brachial valve. 



105. " hirstita , Western Chemung. Pedicle valve. 



106. Same as fig. 105; opposite, or brachial valve. 



107. Produdella hystrinda. Western Chemung. 



108. Amboarlia umbonata var. gregaria. Interior cast of pedicle 



valve. Chemung, Common, 



109. Same as 10S, brachial valve. 



no. Rhipidomclla vanuxemi. Cast of interior of pedicle valve. 

 East Portage and east Chemung. 



in. Schizophoria tioga* Imprint of exterior of pedicle valve. 

 Chemung, mostly eastern. 



112. Same as in. Sarface more or less exfoliated. 



113. Dalmanella Icon en sis. Cast of interior of pedicle valve, 



and the exterior of the same valve. Western Che- 

 mung, especially Cattaraugus and Chautauqua Co\s. 



114. Stropheodonta pcrplana var. ?iervosa. Cast. Eastern Che- 



115. Stropheodonta cayuta. Eas tern Chemung, niostry. Common. 



116. Orihoiheics chemungensis. Chemung, east and west. 



Fig. Explanation of Plate *XIIL 



117. Orthothetes chemungensis. Somewhat eroded pedicle valve. 



Common. 



118. Strophonclla calata \ Interior of brachial valve. Central 



Chemung. Rare. 



(Sponge.) 



119. Dictiophyion tuberosum. Common locally in lower Che- 



mung, especially on Mr. Cotton's place near Avoca. 



