86 



PAI-^EONTOLOGY OF KEW-VOKK. 



Poyilion und /uai'ilj/. h\ tlie slialc hclow tlu^ die hcil al VVolcott, Wiiyiii- cnuiity. 



{Stale Vnl/reliim ) 



477. 8. TELLINOMYA CURTA («. .9/;.)- 



PL. XXVn. Figs. lUaml i:i. 



Shell ovate-rhomboiilal, length oiue and a half the height ; antciior extremity short, abruptly 

 rouiulc'd ; beak elevated above the cardinal margin ; posterior extremity obliquely truncated ; 

 l)osterior umbonal slope angular or sub-carinated, with a sinus between it and the margin of 

 the shell ; surface marked by concentric undulations. 



This shell is readily distinguished from any of those preceding, by the obliquely truncated 

 posterior extremity, and stronger folds upon the surface. The beak is also more elevated, 

 standing prominently out from the cardinal line. In the drawing of fig. 10, the beak is in- 

 correctly blended withlhc cardinal margin. 



Position and localiltj. In the shales beneath the ore bed at VVolcott, Wayne county. 



47S. 4. ORTIIONOTA CURTA. 



Pl. XXVII. Fig. 11 a, b. 

 Orlhonota curia. Hall, Geol. Rep. 4th District, 1843, pag. 76, fig. 1 



Shell sub-quadrangular, oblong, length from twice and a half to three times the height ; 

 posterior umbonal slope sub-carinated ; hinge-line straight ; anterior extremity short, con- 

 tracted in front of the beak, and rounded or sub-acute ; posterior extremity obliquely truncated ; 

 surface marked by prominent concentric folds, which are more conspicuous on the anterior 

 and central portions of the shell. 



The proportions of this, as well as the other species, are much altered by pressure, as 

 shown in the two specimens figured, which give the extremes noticed. The specimen fig. 11 

 a, however, retains more nearly its original form and proportions, judging from other speci- 

 mens. It is readily recognized by the straight hinge-line and strong concentric folds. 



This species possesses the true characters of the genus Orthonota, as established by Mr. 

 Conrad. 



Fig. 11a. 'I'he right valve of a specimen of natural size and proportions. 

 Fig. 11 i. A specimen of the left valve, narrowed by pressure. 



Position and locality. In the shale below the ore bed at Wokott, and in the upper green 

 shale at Rochester. {State Coiiecthn.) 



