of the Fishery Board for Scotland. 131 
In June 2 females were ripe and 2 males had fairly large testes. Two 
males from the Firth of Forth were ripe. 
The spawning time of this species is, according to M‘Intosh and 
Masterman, March—June. 
The ovary of Juscus and minutus is distinctly triangular. The base of 
the triangle is parallel and close to the swim-bladder, the apex is the 
attachment by the oviduct to the anal region. The ovary grows forwards 
into the abdominal cavity and posteriorly into the post-abdominal cavity. 
The Ripe Eggs of Luscus and Minutus. 
G. luscus.—The ripe eggs of duscws were found in a female in February. 
The transparent eggs measured 1:1 x 1:25 and 1:2 x 1:25mm. The 
opaque eggs in the same ovary measured about ‘7mm. in diameter. The 
fish had been in formaline solution. 
In March the eggs, which were dead, were pressed out by the genital 
aperture. They were ripe, and measured 1:07 x 1:25; they were in the 
fresh condition. 
Cunningham found the eggs of a ripe Juscus to measure from 1:05- 
115mm. M‘Intosh and Masterman found that the ripe eggs of this 
form after being preserved in spirit measured 1:14—1:16mm. in diameter. 
G. minutus.—In January three-fourths of the eggs in the ovary were 
yolked. 
In February, in one fish the yolked eggs measured ‘55mm. in diameter. 
On April 1 two of the minutus were in a spawning condition. The 
eges flowed freely out at the genital pore. They were not fertilised: no 
ripe male was available. After being in water overnight some of the eggs 
remained transparent and floating. They were measured, and the sizes 
of their diameters in millimeters were as follows:—1, 1, 1, 1, 1, 1, ‘97, 
ieee OF. 97,98, 91s 9D Oyo 54.8 9,0°9) X)“BDs "875,875, 81,, 87. 
87. Some of the eggs showed a striated zona. 
According to M‘Intosh the ripe egg of minutus measures ‘906mm. in 
diameter. 
Maturity of G. esmarkit. 
G. esmarkit.—The smallest mature specimens of this form, so far as the 
development of the reproductive organs bore witness, were a male at 
llem. and a female measuring 9cm. in total length. Both had developing 
genital organs. 
Holt found two ripe females, measuring 43in. (about 11cm.) in length, 
in April. Fulton says that spawning probably takes place in February 
and March. 
The ovary of esmarkii is like that organ in Juscus and minutus—— 
triangular in shape. It has only a slight attachment to the roof of the 
abdominal cavity, except for the ureter. It grows forward along the floor 
of the abdominal cavity, and is in some specimens pushed to one side by 
the great development of the liver. 
The Swim- Bladder. 
The swim-bladder in duscus and minutus is large. It is usually found 
to be ruptured. In one case an uninjured swim-bladder was noticed. 
The Skulls of Luscus, Minutus, and Esmarkit. 
The skulls of Juscws and minutus resemble one another much, and both 
differ distinctly from the skull of esmarkii. The main character of 
difference is the slope of the ethmoid bone. When the three skulls are 
