THE FISHES OF THE IRISH SEA. 69 
Channel, and off Morecambe. There are also the following records:—River Dee, not 
uncommon (Byerley) ; in the Alt, scarce (Parker) ; another species has also been seen in the 
Alt (? P planert); they were gregarious 12 or 14 together in gravelly shoals (Byerley) ; in the 
Dee (A. O. Walker), and in the Menai Straits (White). 
Order 22 HYPEROTRETA. 
Roof of mouth perforated by nasal sac. 
Family Myxinip. 
This group of marine parasitic fish-like animals are the lowest living true vertebrates. 
The ear has only one semicircular canal. The external openings of the gill pouches are 
continued into long tubes, which have one posterior opening on each side of the body. The 
nasal sac communicates with the mouth cavity. There is no dorsal fin. 
MyxIne GLutTinosa, Linn.—Hag,. 
(Day’s British Fishes, vol. II., p. 364, Pl. CLXXIX., Fig. 3.) 
The ‘‘Glutinous Hag” ranges over the north-west coasts of Europe and the east 
coast of N. America. It is mainly a northern fish, and is commoner in Scandinavian and 
Scottish waters than in the Irish Sea. 
It has been recorded from Dalkey, Co. of Dublin, by Wright, and from Swansea by 
Day. We have not yet found it in our area, 
