900 



HISTORICAL GEOLOGY. 



1506 



' 1506, 1507. 



1507 



1506 a 



Miocene. — Figs. 1506, a, Crepldula costata ; 1507, Cypraea Carolinensis. Meek. 



1508 



1508-1510. 

 1509 



1510 



Pliocene. — Floridian group. — Fig. 1508, Area crassicosta ; 1509, Venus rugatina (x ^); 1510, Arcoptera avicu- 



liBforrais (x ^). Original. 



Insects. — The Insects of the Plorissant basin, described by Scudder, 

 include species of all the grand divisions ; and hundreds of some of them. 

 The number, thus far made out, according to this author, is of Orthopters, 

 24 ; I^europters, 57 ; Hemipters, 220 ; Coleopters, over 400, of which 116 are 



1511. 



1512. 



Insects. — Fig. 1511, Prodryas Persephone ; 1512, Tipula Carolinae. Scudder. 



Ehynchophora ; Dipters, 250 ; Lepidopters, 9 ; Hymenopters, about 235 

 species. Of the Dipters, 51 are Tipulidae, and one of these, two thirds of an 

 inch in length, is represented in Fig. 1512, and one of the Butterflies, in Fig. 



