25 



Explanation of Plate XII. 

 Fig. (Chemung Brachiopoda.) 



ioo. Atrypa hystrix. Exfoliated. West Chemung. 



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



1 02. Productella lachrymosa. Chemung, especially western. 



103. var. stigmata. W. Chemung. 



104. Imprint of brachial valve. 



105. hirsuta. Western Chemung. Pedicle valve. 



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



107. Productella hystricula. Western Chemung. 



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



valve. Chemung. Common. 



109. Same as 108, brachial valve. 



no. Rhipidomella 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 leonensis. Cast of interior of pedicle valve, 



and the exterior of the same valve. Western Che- 

 mung, especially Cattaraugus and Chautauqua Co's. 



114. Stropheodonta perpldna var. nervosa. Cast. Eastern Che- 



mung. 



115. Stropheodonta cay uta. Eastern Chemung, mostly. Common. 



116. Orthothetes chemungensis. Chemung, east and west. 



Fig. Explanation of Plate XIII. 



117. Orthothetes chemungensis. Somewhat eroded pedicle valve. 



Common. 



118. Strophonella ccelata. Interior of brachial valve. Central 



Chemung. Rare. 



(Sponge.) 



119. Dictiophyton tuberosu?7i. Common locally in lower Che- 



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



