PLATE XXXII. 



.My TILAKf'A DMBONATA. 

 I'agc 857. 



1-4. The right, left, anterior and posterior views of an individual preserving both valves. The 

 specimen baa been slightly compressed laterally, giving an unnatural Bharpness to the rostral 

 portions. 



Chemung group. Ithaca. X. Y. 

 ;.. 6, 7. I lie i' sterior, anterior and right sides of a specimen. FL'. 6 shows what appears to he the 

 pallial line terminating near the beak. 



Chemung group. Mansfield, Pa. 



Myhlarca Chemtjngensis. 



Page 258. 

 A small l-iirli t valve 1 showing the striated ligamental area. 



Chemung group. g, Alleghany Co., N. Y. 



A left valve with tin- beak partially broken away showing the small cardinal teeth. 



Chemung group. Rockville. Alleghany Co., X. 1". 

 The interior Of a left valve from an impression in the shale, showing- the striated hinge-area. 



Chemung group. Rockville, A. Y 



A small, broad right valve. 



An impression of the margin of a large left valve, showing the form of the hinge and its breadth as 

 extending within the margin of the shell. 

 Chemung group. Rockville, N '. Y. 

 Fig. 14. A very narrow and erect left valve showing also the striatums of the hinge. 

 Chemung group. East Randolph. X. Y. 



Mytilakca REGULARIS. 

 Pagi i 



I g 12. A left valve showing the broad rounded form and straight erect beak. 

 Chemung group. / I »., X 1'. 



Mytilakca cakixata. 



Page 



Plate 33. 

 15. A small left valve. 



Chemung group. Near Elmira, N. Y. 

 Kg. 16. A small right valve showing the form of the shell. 



mung group. Factoryville. Tioga Co.. X. Y. 

 IT. IS. Two opposite valves showing some variation in the form of the shell. 

 Chemung group. Near Elmira, X. Y. 

 Kg. 1H. An internal east preserving imp if the cardinal and lateral teeth and showing the striated 



ligamental area. 



Chemung group. .A Elmira, X. Y 



Mytilakca attentat.*. 



Page 360. 



Kg. -20. A left valve showing the erect subcarinate form and attenuate beak. 

 Chemung group. ! . A. 1". 



Btssopteria RADIATA. 



Page -■">- 



See Plate so. 



21. A right valve imperfect at the beak, but showing the surface characters and angular anterior side. 



22. An imperfect left valve which shows the general outline. The radii are tut so distinctly duplicate 



as on the i men. 



Chemung group. Mansfield, . . Pa. 



