191 



I 





. 



Fig. 93. Rhipidomella penelope. Dorsal, lateral and cardinal view of a large specimen : 

 a small pedicle valve ; a larger brachial valve ; interior of pedicle valve ; enlargement of 

 striae/ a young specimen, dorsal view (from Hall). 



Measurements. — Large specimen: length, one and seven- 

 sixteenths inches (36 mm.); width, one and nine-sixteenths 

 inches (40 mm.). 



Rhipidomella idonea. Hall. (Fig. 94.) (Pal. N. Y., 

 Yol. IV., p. 52, PL LXIII.) 



•* 





IsS^S&v 



Fig. 94. Rhipidomella idonea. Ventral, lateral, cardinal and dorsal views of a charac- 

 teristic specimen (from Hallj. 



