PLATE XXYII. 



LiMOPTEKA JIACKOPTERA." 



Page 246.- 

 See Plates 24, 26, 28, 29 and 92. 

 Fig. 1. The rig-ht valve of a Fmall imliviilnal which is very perfect in fomi. 

 Fig. 2. A small right vahe. 



Hamilton group. Summit, 8clioharie Co., N. Y. 

 Fig. 3. A .somewhat larger example. 



Hamilton group. Lebanon, Madlion Co., N. Y. 

 Fig. 4. A left valve oliliquely compressed and showing no surface radii. 

 Fig. 5. The right valve of the preceding. 



Fig. 10. A profile view showing the comparative convexity of the valves. This specimen is the original 

 of Conrad's description. 



Hamilton group. Madiiim Co., N. Y. 

 Figs, (i, 7. Two views of a sjiecinien which shows very distinctly the character of the surface. 

 Fig. 8. A cardinal view of a large specimen. The figure was intended to .show the striated area of both 

 \ alves an<l a vertical depression undoi' the beafc as if from a receding cartilage pit ; but 

 these features have imfortunately >>een lost in the lithography. 

 V'li:. '.>. A i-ardinal view of an individual distorted by lateral compression. The internal mould shows one 

 distinct point of muscular attachment on the apex of each valve. See plate 28, fig. 4, for an 

 illystration of the right \alve of this specimen showing the umbonal muscular impression and 

 pallial line. 



Hamilton group. Madison, Co., N. Y. 



