520 
MR. J. F. BULLAR ON THE DEVELOPMENT 
lived, in a glass covered with a piece of gauze to prevent the escape of the young. 
They all, however, succeeded in escaping except three. When these first came out 
their livers were filled with oil-drops, I kept them and examined them every day 
with the microscope. There was less oil each day, and they got more and more 
transparent. For several days I could not get any proper fish to put them on, and 
the oil had so much diminished that they had only one or two small drops left in 
their livers, and must have been very hungry, for directly I put them on the fish 
they stuck in their claws and held on tight. It is worthy of notice that, although 
embryos of a species which lives in the mouth, they began by fixing themselves on the 
outside of the fish, where they seemed quite happy. I was unfortunately unable 
to trace their development further, as the fish on which they were placed died in the 
night, and in the morning when I found them the embryos were dead. Although before 
they fixed themselves to the fish they were so transparent that all the organs could 
be easily seen, I was unable to make out any trace of either the generative organs or 
of the so-called renal tubules. 
It seems probable that these organs may be developed at the time that the limbs of 
the seventh thoracic segment appear, since they are both connected with it. 
Description of the Figures. 
The same letters are used in all the figures. 
O 
Ab. Abdomen. 
An. Antenna. 
Ap. Appendages. 
C. Thickened cuticle forming cornea. 
C.G. Cerebral ganglion. 
C. T. Connective tissue. 
D. Dorsal organ. 
E. Eye. 
Eb. Epiblast. 
FG. Fore-gut. 
FGh Gullet. 
FG". Stomach. 
Fr. Frontal lobes. 
H. Heart. 
HG. Hind-gut. 
I. M. Inner Membrane. 
L. Liver. 
L. D. Duct of liver. 
M. Mouth. 
Mb. Cells beneath the epiblast. 
Mbn. Pigmented membrane. 
Ms'. Muscles. 
N. Nervous system. 
O. M. Outer membrane. 
Op.T. Optic tract. 
T. Telson. 
Tli. Thorax. 
Y. Valves of heart. 
X. Kristal kegel. 
Y. Yolk. 
Z. Z'.Z". Sensory parts of eye. 
