807 



Pteri. 



showing the lower branching vessels, the upper 

 vessels or channels, and the tubules (seen from 

 below). 



Pterichnus centipes, Acanthicnus tardigradiis), Hitch- 



P teri cKnus c en tip e s . 



Hltckcock /^ 



p/.V//. 





V -Ny 



>:^ 



"^ 





Copeza propmqata 



cock. Sup. to Ich. Mass. 1865, page 14, plate 7, fig. 3, the trail 

 of some centepede or m^^riopod which lived with the gigan- 

 tic frog-like, lizard-like, and bird-lizard or bird like animals 

 of the Connecticut river red-shale and sandstone, and walked 

 on the soft muddy shore of the estuary. In the Ichthyology 

 Mass., 1858, Hitchcock described it as perhaps an insect (crus- 

 tacean) moving by leaps rather than like the hairy or many- 

 legged worms. (I copy also two other myriopod tracks, Bincj^- 

 Gulipes Gurvatus (going and coming), and Copeza propinqitis 

 ipropinquata) Lithographus hieroglyphious. Hitch.) — Triaf<.) 



Pterichthys milleri, Agassiz, figure from Pander, in Owens^ 

 Palasontology, 1860, p. 119, 1861, p. 142, the dorsal surface of 

 this winged fish discovered by Hugh Miller in 1833, in the Old 

 Red Sandstone formation of Scotland, described by him in 

 1840 (Proc. Geol. Sect. British Association at Glasgow) ; wear- 

 ing a great buckler or backplate, and a breast plate, jointed 

 together at the sides ; the hinder part and tail defended by a 

 chain-armour of small enameled (ganoid) scales; one smal] 

 dorsal fin {d) ; two armored pectoral fins, enabling the fish 

 ^' to shuffle along the sandy -seabed if left dry at low water." 

 24 



