2Jt6 [AprU, 



From the Trias of Nortii America one species o£ Coleopfera lias 

 been recorded by Mr. Scudder,* -who also states that certain question- 

 able tracks in the rocks of the Connecticut Valley have been referred 

 by Prof. Hitchcock to Insecta and Myriopoda. 



Prof. Danaf has figured a fossil larva of a Neuropterous insect, 

 obtained fi-om Turner's Falls, Connecticut Valley, which is believed by 

 Dr. Le Conte to have been related to the genus Ephemera ; Dana also 

 alludes to the tracks in the rocks before mentioned, which he supposes 

 to have been made by the larvae of insects, and by Crustacea. 



The ArthropodaX of this period include, in addition to Insecta, as 

 we have seen, Myriopoda (possibly) and Crustacea, the latter being 

 chiefly represented by Ostracoda. 



Tne Molliisca are exceedingly abundant, and include, in addition 

 to a number of genera characteristic of the period, several Palaeozoic 

 types. 



The Yertehrata are represented by animals of almost all the 

 existing classes. § Tne fishes are principally Ganoids; and the Am- 

 phibians belong exclusively to the gigantic Lahijrintliodontia, which, at 

 the close of this period, disappear altogether. 



The reptiles comprise living as well as extinct Orders, the former 

 including Crocodilia, Lacertilia, and Chelonia,\\ and the latter Plesio- 

 sauria, and Deinosauria. 



Although no remains of birds have been discovered in rocks of 

 this age, numerous foot-prints in the Triassic strata of the Connecticut 

 Valley are confidently believed by many geologists^ to have been made 

 by animals of this class. 



The Mammals are represented by two small forms, both referred 

 to extinct genera of Insectivorous Marsupials. 



The Flora of the Period, although decidedly Mesozoic, included 

 some Palaeozoic types. 



The dominant forms were EqiUseta, Ferns, Cycads, and Conifers ; 

 but no remains of true Grasses, Palms, or Angiosperms have been dis- 

 covered. 



The Avenue, Surbiton Hill, S.W. : 

 \st March, 1879. 



• Geol. Mag., vol. v. May, 1868 (neither the genus nor the family to which the insect belonged 

 is mentioned). 



t '■ Manual of Geology," antea cii., pp. 410, 411. 



t In this and the remaining papers of the series I do not propose to refer to animals belonging 

 to any sub-kingdom lower in the scale than the Arihropoda. 



§ Pixces, Amphibia, Reptilia, Aves, and M(o,imatia. 



II This Order is only known at this Period by more or less doubtful footprints. 



i[ Hitchcock, in Mem. of Amer. Acad, ^new series), vol. iii, j). 129, 1848 ; and Dana, in 

 " Manual of Geology," antca cit., p. 411. 



