54 PALEONTOLOGY OF NEW-YORK. 



however, that in the measurement of striae in the space of two lines, on 

 some of the more finely striated species, it is scarcely possible to include 

 the same number of striae between the points of the compasses at any 

 two places upon the surface. 



Sirix ill Ihe «piice of two line*.' 



Brsons. 



Orthis ALsrs , 



Orthis LIVIA.. . 

 Orthis idoneus . 



Length. 



1.13 

 1.03 

 1.12 

 1.07 

 .80 

 1.24 



Orthis semele 



1 Orthis vancxemi, 1.03 



.2 •' " .. 1.15 



3 " «« .. 1.18 



4 " « .. 1.00 



5 «« " . . .88 

 1 Orthis penelope, 1.37 



2 

 8 

 4 

 5 

 6 



1.33 

 1.43 

 1.15 

 1.17 

 1.17 



1 Orthis leccosia, 1.02 



2 " " .. 0.79 



3 " " .. 0.88 



4 » " .. 0.95 

 Orthis idas 1.53 



1 Orthis lenticui.abis, .77 



2 " " . . .59 

 Orthis pr.opinqua, .83 



WUlh. 



1.23 

 1.24 

 1.21 

 1.23 

 .96 

 1.40 

 1.10 

 1.28 

 1.23 

 1.09 

 1.03 

 1.59 

 1.58 

 1.60 

 1.36 

 1.39 

 1.31 

 1.04 

 0.83 

 0.95 

 1.02 

 1.71 

 .77 

 .62 

 .98 



Depth. 



.40 



.40 

 .45 



.43 

 .55 

 .46 



.37 



.52 

 .40 

 .40 

 .48 

 .40 

 .47 

 .28 

 .62 



I>ngthofarau 



.79 



.57 

 .55 

 .40 

 .88 

 .45 

 .60 

 .47 

 .47 

 .44 

 .65 

 .58 

 .73 

 .58 



.54 

 .46 

 .31 

 .37 

 .34 

 1.14 

 .54 

 .44 

 .55 



Keu- beuk. Middle. 



n f 



10. a. 



it 



13. 



« 

 if 

 i* 

 ii 

 if 

 il 



ii 



a 



H 



IS. 



H 



i* 

 i^ 

 it 

 i» 



ii 



H 



±± 



H 



T» 



ii 

 H 

 ii 

 ii 

 U 

 ii 

 i? 



if 



ii 

 i! 



? 



Near front. 



i 



X 



a. 



f 



ia 



a. 



f 

 i 



I 

 f 



a. 





ii 



* Id (b«M threo colnmiu, the upper Sgures indicate 

 t Bwidei MTenl finer intermediate onca. 



the dorsal valrc, and the lower the ventral valre. 

 i Counting the intermediate onoa. 



