200 THE NAIADES OF MISSOURI 



Shell Characters: — Shell elliptical, small or medium, beak sculp- 

 ture rather double-looped or distinctly sinuate with posterior sinuation 

 somewhat open. 



ERRATA. 



(Plates I— XXVIII.) 



PI. I, Fig. 2, for "vavel" read "valve". 



PI. II, Fig. 5a, Supply label 4, i. e., "Extreme dorsal point." 



PI. V, Fig. 12b, for " Utterbacki" read " Utterbackii" ; do. PI. XX, 

 Figs. 63 A — D. 



PI. VI, Figs. 14 a— d, for " Curtisi" read " Ciirtisii" \ do. PI. XXVIII, 

 Figs. 109 A — D. 



PI. IX, Fig. 19, After "feeding" supply comma and "respiring". 



PI. XIII, Fig, 26, Supply "-Hundred" after "One;" do. PI. XXVI, 

 Fig. 90. 



PI. XVI, Figs. 38 A — D, for " Quintardi" read " Quintardii" . 



PI. XIX, Fig 52, for " cylindirca" read " cylindrica" . 



PI. XXV, Fig. 81, for " clintonesnsis" read " clintonensis" . 



PI. XXVIII, Fig. 107, for " ventricoas" read "ventricosa" 



