262 
Proceedings of the Royal Society 
4. On New and Little-known Fossil Fishes from the Edin- 
burgh District, No. I. By K. H. Traquair, M.D., F.G-.S. 
FAMILY PALiEONISCIDiE. 
Genus Nematopty chins, Traquair, 1875. 
This genus was instituted by the author for the reception of the 
Pygopterus Greenockii of Agassiz, and characterised in the “ An- 
nals and Magazine of Natural History ” for April 1875. It differs 
from Pygopterus in the form of the scales of the flank, which are 
much higher than broad, and having their articular spine arising 
from the whole, or nearly the whole of the upper margin ; in the 
structure of the pectoral fin, in which all the rays are articulated 
for the greater part of their extent ; and in the form of the anal, 
which is in shape like the dorsal, and is not produced backwards 
in the peculiar fringe-like manner characteristic of Pygopterus . 
Since the publication of the notice above referred to, remains of 
N. Greenockii have turned up in two other localities near Edinburgh, 
viz., near Juniper Green in the horizon of the Wardie Shales 
(Museum of Science and Art), and at Baw Camps, near Mid Calder, 
in that of the Burdiehouse Limestone (Collection of the Geological 
Survey of Scotland). 
The following is new to science. 
Nematopty chius gracilis , sp. nov. Traquair. 
Of this two specimens have occurred at Gilmerton. The 
more perfect of these, compressed on its side, displays the entire 
contour of the fish, including all the fins, and measures 9 inches in 
total length, by 1J inch in depth between the head and the ven- 
trals ; the length of the head is contained about 4J times in the 
total. The ventral fins arise opposite a point 3J- inches distant 
from the tip of the snout ; the commencement of the anal is mid- 
way between that of the ventral and of the caudal ; the dorsal is 
situated nearly opposite the anal, commencing only \ inch in front of 
it. The form of the fish is thus elongated and slender, gradually 
tapering from behind the shoulder towards the tail, the dorsal fin 
being situated very far back. The other and slightly longer spe- 
