318 



HISTORICAL GEOLOGY. 



flower-loving, honey-loving, and social, such as flies, but- 

 terflies, bees, and ants (Dipters, Lepidopters, and Hyme- 





FIG. 248. Carboniferous crustacean : 

 Anthrapalsemon gracilis. (After 

 Meek and Worthen.) 



FIG. 249. Carboniferous insect : 

 Blatta maderae, wing - cases. 

 (After Lesquereux.) 



nopters], are not yet 

 found, because there are 

 not yet any flowering 

 plants. 



Fishes. We have 

 little to add here to 

 what has already been 

 said under the Devo- 

 nian. The same kinds 

 of fishes viz., Ganoids 

 and Placoids still pre- 

 vail. Of the Ganoids, 

 however, the Placo- 



derms passed away with the Devonian, but the Lepido- 

 ganoids continue, and some of them become still more 

 reptilian. We note also an advance in the Placoids, in 

 that an intermediate form (the Hybodonts) between the 

 Cestracionts and true sharks (Squalodonts) here appears. 



FIG. 250. Carboniferous insects : Zylobius 

 sigillariae. (After Dawson.) a, anterior ; 5, 

 posterior portion, enlarged. 



