EXPLANATION OF PLATE XXXIV. 



Ci'Cuij,ai;a wuriuBURvr.Nsis n. sp p. 393 



1. Till.: l\-|)c specimen, an internal cast >'i{ a left \'al\e. 

 Jl'oudbury clay: Lonllanl. {'ti')^}. 



Arca ouixtifiCE.MHAiiiATA (lalib, p. 410 



2-3. Views (if the left side and the pnstericjr end of a nearly per- 

 fect internal cast. 



I'iiicciiliiicii limcsanil : 1 1 urffi'illc. ii'i). 



Arca Rr)STr,rj,.\TA iXlrirton p. 408 



4-5. Views I if tile rii;lit side and dorsal margin nf a ver}' perfect 

 internal cast li^iireil Ijy W'liillleld. 

 Xavcsiiil! iiitirl: [-1 ulimlcl. 



Arca unioi'Sis Cmirad p. 407 



6 j\ii internal cast of the right \al\e. 



Navcsuik marl: Crossz^'iiks Creek, ([4<)). 

 7-8. Left and dorsal \-ie\vs cif a iiearl\" complete internal cast. 

 ( .\fter Wdiitheld.f 



Arca hcksa ( \\ hitlleld) p. 409 



0. The internal cast of a right \'al\"e. 



Mercliaiil-c'illc cluy-iiiarl; Lcitola, (163). 



ArC-V sp. 



lo-lJ. Views of three internal casts. 



J'liicciilozeii foriiialioii : near Deal, (JI2). 



950 



