4 Animal Remains in llie Coal of Nova Scotia. [June 2, 



(17.) Illumination of the, Field. The method of examination, which 

 is due to Captain Abney, is described. The question of the falling off cf 

 the intensity oi illumination from the centre of the plate is discussed. 



II. " Supplementary Report on Explorations of Erect Trees 

 containing Animal Remains in the Coal-Formation of Nova 

 Scotia." By Sir J. WILLIAM DAWSON, F.R.S. Received 

 April 25, 1892. 



To the memoir which I had the honour to present to the Royal 

 Society on this subject in 1882* I appended a note from Dr. Scudder, 

 of Cambridge, U.S., so well known for his researches in fossil Insects 

 and Arachnidans, in which he gave a preliminary account of the 

 remains of Arthropods in my collections which I had submitted to 

 him. He has only in the present year completed his examination of 

 these remains, most of which are very fragmentary, and much 

 damaged by unequal pressure. The result has been embodied in a 

 Report on Canadian Fossil Insects, now in course of publication by 

 the Geological Survey of Canada. 



In this report he will describe from the contents of the Sigillarian 

 stumps extracted by me, with the aid of the grant of this Society, 

 three new species of Myriapoda, making, with the five previously 

 known from these remarkable repositories, eight in all, belonging to 

 two families, Archiulidaa and Euphoberida3, and to three genera, 

 Archiulus, Xylobius, and Amynilyspes. The three new species are 

 Archiulus euphoberioides, Sc., A. Lyelli, Sc., and Amynilyspes (sp.). 

 The remains of Scorpions he refers to three species, Mazonia acadica, 

 Sc., Mazonia (sp.), and a third represented only by small fragments. 

 The characters of the species referred to Mazonia he considers as 

 tending to establish the generic distinctness of Mazonia from Eoscor- 

 pius. Dr. Scudder also notices the fragment of an insect's head con- 

 taining part of a facetted eye, mentioned in my memoir, and considers 

 it probably a portion of a Cockroach. 



Much credit is due to Dr. Scudder for the care and skill with 

 which he has worked up the mostly small and obscure fragments 

 which I was able to submit to him, and which are probably little 

 more than debris of the food of the Amphibians living for a time in 

 these hollow stumps, and devouring such smaller animals as were so 

 unfortunate as to be imprisoned with them. In this connexion the 

 suggestion of Dr. Scudder is worthy of attention, that the scaly 

 armour of the smaller Microsaurians may have been intended to 



fend them against the active and venomous Scorpions which were 

 temporaries, and some of which were sufficiently large to 

 * ' Phil. Trans.,' 1S82, p. 621. 



