JOURNAL OF MICROSCOPICAL SCIENCE. 
DESCRIPTION OF PLATE III, 
Illustrating Mr. Huxley’s paper on the Development of the 
Caudal Skeleton in the Stickleback (Gasterosteus Ciurus.) 
Fig. 
1.—tThe tail of a young fish, 5-16th of an inch long. 
2.—The tail of a young fish, 7-16th of an inch long. 
3.—The tail of a half-grown specimen. 
4.—The tail of a full-grown Gasterosteus. 
The two last figures are drawn in their proper relative proportions, while 
figs. 1 and 2 are on a much larger scale than figs. 3 and 4. 
The letters have the same signification throughout. 
“Pes BPRS VASO XR 
= § 
. Centrum of the last distinct vertebra. 
. Urostyle. 
. Notochord. 
. Neural arch of the last distinct vertebra. 
. Interior arch of the same vertebra. 
. Inter-hemal cartilage or bone of the last ordinary vertebra. 
. Anterior hypural apophysis. 
Posterior hypural apophysis. 
. Principal caudal fin-rays. 
Interneural cartilage or bone of last ordinary vertebra. 
. Anterior epiural apophysis. 
. Posterior epiural apophysis. 
o. Superior accessory fin-rays. 
. Inferior accessory fin-rays. 
