154 CALIFORNIA FISH AND GAME. 
at the smaller end. The position and size of the fish and yolk, 
as seen through the opaque, dark brown, leathery case, are indicated 
in the drawing by broken lines. The fish was probably very young, 
for its length at the time of receiving was 43 mm., which exceeded 
the yolk by only 3 mm. The egg case had growing on it at each 
end colonies of bryozoans, which died and had soaked off by the end of 
four months. 
At first there were no apertures in the case which could be detected, 
although each end contained two slight grooves, shown in the figure, 
situated on opposite sides of the case. To one facing the egg case, 
with the smaller end up, one groove was visible at each end on the 
left hand side. The other two grooves could not be seen without 
turning the case over, which would bring them on the left hand side. 
Those at the larger end were about 20 mm. long, and those at the 
smaller about 11 mm. On April 3 a small air bubble was visible inside 
the case, which proved the presence of an aperture. Upon examin- 
ing the case and squeezing it gently it was found that water squirted 
out through a small slit at the larger end, which was one of the 
grooves beginning to open. By April 15 the other groove at the 
larger end and on the opposite side had opened. A little carmine 
was placed with a pipette near the apertures, but no marked current 
was visible. By May 20 both of the grooves at the smaller end had 
opened. These apertures, when completely opened, were about 1 mm. 
wide. . 
Attempts were made to measure the fish, but the results are only 
approximate on account of the opacity of the egg case, and of its 
constant activity, especially at first. The measurements were not 
taken at regular intervals, but the following table will give some idea 
of the rate of growth: 
Date—1920 Length of Fish Width of Head 
March 17 43 mm. 
April 15 60 mm. 
April 29 67 mm. 
May 20 81 mm. 
May 25 ST mm. 16 mm. 
June i, 104 mm. 19 mm. 
June “17 115 mm. 22 mm. 
June 24 123 mm, 25 mm. 
July 6 130 mm. 26 mm. 
August 19 155 mm. 27 mm. 
Measurements were also taken of the yolk, the diminution of which 
is shown by the following table: 
Date—1920 Length of Yolk Sac Width of Yolk Sac 
March 17 40 mm. 
April . 15 37 mm. 
April 29 37 mm. 
May 20 35 mm. 
May 25 31 mm. 20 mm. 
June ‘hs PA mitanen ys 17 mm. 
June 17 24+ mm. 13° mim. 
June 24 20 mm. 12. mm. 
June 28 Al7e “avehonts 
July i 14 mm. 
July 6 10 mm. 
July 17 Damm: 
July 28 3 mm. 
‘Up until April 15, the yolk, though shortening, had kept the same 
general oval shape. At this time it became narrower and: somewhat 
