EXPLANATION OF PLATES. 
All figures were drawn with the aid of an Abbé camera lucida, from specimens 
of Lepidosteus osseus, L. 
ba. spi. 
can 
chr’ph. 
drm f’br. 
drm. spng. 
Jue, 
Jac. e’drm. 
Jor. 
gan. 
gin 
gin? 
mb. ba, 
ABBREVIATIONS. 
Base of spine. 
Canal. nl. 
Chromatophore. od’ bl. 
Fibrous portion of dermis. pap. spi. 
Spongy sr Hu pig. 
Surface. 8c. 
Surface of ectoderm. sc bl. 
Foramen. spi. 
Ganoin. tbl. de. 
Gland, first kind. tbl. Ipd. 
Gland, second kind. vs. sng. 
Basement membrane. 
mb. gan. 
Ganoin membrane. 
Nucleus. 
Odontoblast. 
Spine papilla. 
Pigment. 
Scale. 
Scleroblast. 
Spine. 
Dentinal tubule. 
* Lepidine tubule. 
Blood-vessel. 
” 
