1859.] 



DAWSON FOSSILS IN COAL. 



271 



occurred, I was disappointed in finding no indications of any other. 

 Two specimens of a minute discoidal shell, which I at first supposed 

 to be molluscous, proved to be merely examples of the little Spiror- 

 bis so common in the coal-measures of the Joggins. These may 

 have formed part of the food of the smaller reptiles, or may have 

 been drifted in, attached to the vegetable fragments. In neither 

 case woidd the occurrence of these shells imply access of salt water 

 to the deposit ; as I have good evidence from other parts of the sec- 

 tion that this little shell, though apparently a Spirorbis, and allied 

 to, if not identical with, the Sipvrorbis or Microconchw carbonariits 

 of the British coal-measures, was not an inhabitant of the sea, but 

 rather of fresh and brackish water. 



Pigs. 1-3. — Pupa vetusta from the Coal-measures of Nova Scotia. 

 Fig. 1. 



Fig. 2. 



Fig. 3. 



Fig. 1. Mugnified specimen. Thfl natural size is indicated by the vertical line 



at the side. 2. Ridges, magnified. •". Lpex, magnified. 



§ 3. Carboniferous Myriapod—Xylobius Sigillaria, d. 



fPigS. MM 



rt m. 



I propose the above name tor an articulated worni-likr animal, of 



which numerous flattened specimens were found associated with the 

 I'll/,,/ vetusta. I was at firsl disposed to regard it as the larva of a 



Vol.. XVI. TAUT I. i 



