252 Evolution and Distribution of Fishes 



They present also the comparative table on the preceding 

 page, which sets forth the relation of the species found in 

 each of the localities already mentioned. 



The relative abundance in some of the above deposits, 

 and rarity in others, of species and genera is due, we take 

 it, to the imperfection of the geological record, and im- 

 perfect modes of preservation, not to actual poverty of 

 fish life in the freshwaters of Miocene time. For in ad- 

 dition to the above, and from other localities, a rich 

 variety of species is known. 



In contrast to the above list, and as being recorded 

 from a Swiss locality not far from some of the above, to 

 which the sea had access, we now append a list as given by 

 A. Wettstein {i8g) from the Oligocene "Glarnerschiefer." 

 It will be observed that these include fishes from very 

 different genera and even families, as compared with the 

 above. Some of them also like J cantJiopleurus and Acantho- 

 derma are highly modified types as compared with any 

 forms found in freshwaters. 



MARINE FISHES 



Sclerodermi. 



Clupeidae. 



Scopelidae. 



Gadidae. 



Berycidae. 



Percidae. 



Teuthididae. 



Scombridae. 



Cyttidae. 

 Fistularidae. 



FROM OLIGOCENE, GLARUS, SWITZERLAND. 



Acanthopleurus serratus. 

 Acanthoderma spinosum. 

 Clupea brevis. 

 Clupea dubia. 

 Clupea megaptera. 

 Melelta (Clupea) Scheuchzeri 

 Scopeloides glaronensis. 

 Nemopteryx tro'^cheli. 

 Acanus longispina. 

 Acanus regleysianus. 

 Acanus gracilis. 

 Podocj's minutus. 

 Archaeoteuthis glaronensis. 

 Lepidopus glaronensis. 

 Lepidopus brevicauda. 

 Thyrsitocephalus alpinus. 

 Palimphyes glaronensis. 

 Palaeorhynchus glaronensis. 

 Hemirhynchus colei. 

 Echeneis glaronensis. 

 Archaeus. 



Archaeoides longus. 

 Archaeoides longicostatus. 

 Archaeoides macrurus. 

 Isurus macrurus. 

 Cyttoides glaronensis. 

 Fistularia Koenigi. 



