s^uoosR.] CANADIAN FOSSIL INSECTS. 65 



and the position of the supposed lateral ocelli (on the upper surface of a 

 depressed sublaminate lateral margin near its middle) would indicate 

 that it was probably a Mazonia ; but the special character of the test, the 

 gentle convexity of the upper surface, and the very distant withdrawal 

 from the anterior margin of the median eyes (for only here is there any 

 place for them on this specimen) would certainly show a different, and a 

 very different, species. 



There remains to be mentioned specifically only the fragment of test 

 shown in fig. 7, where the only certainly natural margin is shown above ; 

 whether the other two nearly straight margins are also natural is un- 

 certain from the conditions of their preser\ration. This bit of test shows 

 a nearly flat, irregularly punctured surface, and I can only conjecture 

 that it belonged to either the upper or more probably the under surface 

 ■ -of one of the larger abdominal segments. In that case it would appear 

 to be too large to have corresponded to an individual of the size shown 

 in fig. 5, but rather to have belonged to one nearly or quite half as large 

 again. Whether it can have belonged to the same species seems very 

 doubtful, for apart from the disparity in size, the character of the surface 

 sculpture bears no sort of agreement with that seen in the other speci- 

 mens ; but of course nothing can be predicated of it without further 

 material. 



Note by Sir J. William Dawson. 



As stated above by Mr. Scudder, the remains described by him in this 

 paper were discovered in the interior of erect trees in the coal-formation 

 of Nova Scotia, into which after they became hollow by decay, amphibians, 

 millipedes, scorpions, and land snails had fallen or crept, and had sub- 

 sequently been covered up and so preserved, when the hollow trees were 

 filled with sand and mud. 



Repositories of this kind were first discovered at the South Joggins in 

 Nova Scotia, by Sir 0. Lyell and the writer, in 1851, and an account of 

 an amphibian and a land snail found in one of them was published in 

 1853.* Additional discoveries, including a millipede, Xylobius sigillarim, 

 were published in 1859.f Subsequently, in several visits to the locality, 

 and with the aid of a grant from the Royal Society, a number of other 

 , trees were taken out and examined. The whole of these trees, with one 

 exception, occur in the sandstone beds forming the cliff and reef of Coal 

 Mine Point, near the Joggins coal mine, and constituting a part of 

 division 4, group xv., of my sectional list of this coal field. J From these 



* Journ. Geol. Soc, Lon., ix., 58. 



tibid., xvi., 268. 



J A cadi an Geology, 1.56-192. 



