NID OB & 10 
om C9 tS — 
SYSTEMATIC ARRANGEMENT. ALS. 
. Blue, Y Lieian. 
. Cole, Y Benloyn lygliw. 
Marsh, Penloyn y cyrs. 
. Longtailed, Y Benloyn gynffonhir. 
. Bearded, Y Barfog. 
. Crested. 
XXIX. 
SWALLOW. 
. Chimney, Gwennol, Gwenfol. 
. Martin, Marthin Penbwl. 
. Sand, Gennol y glennydd. 
.. Swift, Marthin di, 
XXX. 
GOATSUCKER. 
. Nocturnal, Aderyn y droell, 
Rhodwr. 
