162 NEW YORK STATE MUSEUM 



camarotoechia Hall & Clarke 

 Camarotoechia sappho (Hall) 



Pal. N. Y. 4:340, pi. 54 



Large and often gibbous specimens of the normal form are 

 very common in beds VII and VIII. They are for the most part 

 molds of the interior, but a few retain a portion of the shell. 



Camarotoechia horsfordi Hall 



Pal. N. Y. 4:339, pi. 54 



This is a rare species at this locality. One nearly perfect 

 specimen and several fragments have been found in bed VII. 

 The former is a gibbous shell having five plications on the fold, 

 four in the sinus, and five on the lateral slopes. It measures 14 

 mm in length and 17 mm in width. 



Camarotoechia prolifica (?) (Hall) 

 PI. 9, fig. 13-15 



Pal. N. Y. 4:343, pi. 54 a 



Several well preserved specimens in beds IV and V are 

 referred with doubt to this species. They correspond in general 

 proportions and number of plications to Prof. Hall's description 

 and figures, but the plications are more sharply angular, and the 

 umbonal part of the pedicle valve is distinctly elevated, and 

 slopes abruptly to the cardinal margins. There is also a slight 

 median depression near the beak of the pedicle valve. 



Camarotoechia pauciplicata sp. nov. 



PI. 9, fig. 7-12 



Associated with Camarotoechi a s a p p h o and 0. 

 horsfordi are specimens which differ from both in important 

 respects. The outline of these shells is subpentagonal, the 

 greatest width being two thirds the distance from the beak to 

 the anterior margin. Pedicle valve slightly convex in the pos- 

 terior portion but becoming depressed in the sinus and extended 

 in front to meet the margin of the brachial valve. Beak elevated 

 and slightly incurved. Brachial valve gibbous, the greatest con- 



