304 PALjEONTOLOGY OF NEW YORK. 



Surface marked by fine, concentric striae, which become fascicled and form 

 strong undulations on the anterior end of the shell. The striae are acutely 

 recurved on passing the umbonal ridge. Interior unknown. 



Three specimens measure respectively, 75, 63 and 55 mm. in length, and 

 28, 25 and 22 mm. in height. 



Compared with G. carinata the anterior end is proportionally shorter, the 

 sinus more oblique, the posterior end narrower, and the recurving of the striae 

 over the umbonal ridge is much more abrupt. 



The specimen fig. 18 of plate xliv is the typical specimen figured by Vanuxem 

 loc. cit. 



Formation and localities. In the Chemung group, near Owego, Binghamton 

 and Chemung Narrows, N. Y. 



GONIOPHOKA SUBBECTA, n. sp. 



PLATE XLU, FIGS. U, 15 ; AND PLATE XLIV, FIGS. 19, 21. 



Owiiophom ChemungensU (Vandxkm), Halt, (in error). Pal. N. Y., vol. v, pt. 1. Plates and Explanations : 



PI. 44, figs. 19, 21. 1883. 



Shell large, trapezoidal; length more than twice the height; basal margin 

 gently curving, with a slight sinuosity anterior to the middle; posterior 

 margin obliquely truncate, very gently curving ; cardinal line straight, par- 

 allel to the base, having a length of less than two-thirds the entire length of 

 the shell ; anterior end gradually declining from the beak, abruptly rounded 

 below, and limited by an obscure sinus, which reaches the base at about the 

 anterior third. 



Valves moderately convex below the umbonal ridge, scarcely gibbous in 

 the umbonal region ; cardinal slope broad and essentially flat. 



Beaks sub-anterior, small and closely incurved. Umbo prominent ; umbo- 

 nal ridge angular, slightly curving downward and extending to the post- 

 basal extremity. 



Test concentrically striated. The striae above the ridge are simple and 

 continuous, and below they are aggregated into fascicles. Interior unknown. 



