470 Proceedings of Royal Society of Edinburgh. [sess. 
This form has only been found in the Birkhill shales (Llandovery) 
of Moffat, while the graptolite Pleurograptus found on specimen 
015 shows that this specimen belongs to a lower horizon (Caradoc). 
Pleurograptus linearis , Carruthers, is the zonal form of the Upper- 
most zone of the Lower Hartfell shales (Caradoc) of Moffat. I do 
not, therefore, consider that any of the specimens could he deter- 
mined either specifically or generically ; hut if these organic remains 
belong, as they appear to do, to Phyllocarid crustaceans, their 
occurrence along with graptolites in black shales in both the 
northern and southern hemispheres would signify more than a 
near coincidence. 
{Issued separately March 30 , 1905 .) 
