191 



mm 



liiilltU 



Fig. 93. RhipidomeUa penelnpe. Dorsal, lateral and cardinal view of a large specimen : 

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

 strife^: a young specimen, dorsal view (from Hall). 



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

 nixteenths inches ( ''6 nun. ) ; widtli, one and nine-sixteenthw 

 inches (40 mm.). 



Rhipidomella ii)one.\. Hall. (Fig. 94.) (Pal. N. Y., 

 Vol. IT., p. 52, PI. LXIIl.) 



Fig. 94. Rhipidomella icJonca. Venti-al. lateral, carilinal and dorsal views of a charac- 

 teristic specimen (from Hall). 



