388 THE CARBONIFEROUS SYSTEM. 



extending down to the third vein, occurs just where the "nodus" is 

 found in Odonata, and if present would unquestionably remove this 

 insect to a new synthetic family between Odonata and Ephemerina. 

 I cannot judge satisfactorily whether it is an upper or an under wing. 

 The insect measured fully seven inches in expanse of wings — much 

 larger than any living species of Ephemerina. 



Archimidacris Acadicus. 



The new genus and species above named (Fig. 153), have been 

 founded by Mr Scudder on a beautiful little wing discovered by Mr 

 Barnes at the East River of Pictou, in shale overlying the main seam 



Fig. 153. — ArcTiimulacris Acadicus. 



of coal. The specimen is imperfect, being cut off by a leaf of Cordaites 

 lying across it ; but the venation of the part remaining is in very 

 good preservation. Mr Scudder remarks upon it as follows : — 



" The only fossil cockroach yet described from America is that 

 found by Lesquereux in the Carboniferous beds of Arkansas, and 

 called Blattina iienusfa. The wing discovered by Mr Barnes at Pictou 

 differs from it in the curve of the costal border (affecting the direction 

 of nearly every vein in the wing), as well as in the extent and direction 

 of the branches of the mediastinal vein, and in the distribution of the 

 veinlets in the anal area. Nor does this wing agree in character with 

 those of other fossil cockroaches ; it is allied to some which Dr Giebel, 

 in his generic division of the fossil Blattarice^ referred to the genus 

 Blattina. With two exceptions, he had placed all the Carboniferous 

 cockroaches in the same group. This species, fonning the type of a 

 new genus, may be called Archimulacris Acadicus. The generic term 

 is derived from the Greek name of a cockroach." 



In the Journal of the Geological Society, 1861, I described as 

 follows some very remarkable impressions found on the surface of a 

 rain-marked sandstone at the Joggins, containing also reptilian foot- 

 prints : — " They consist of rows of transverse depressions, about an 

 inch in length and one- fourth of an inch in breadth. Each trail con- 

 sists of two of these rows running parallel to each other, and about 



