1. Berrill, N. J. 1925. The development of the skull in the sole and the plaice. Quart. J. Micros. Sci., 69 (274, N. S.): 217–244.
2. De Beer, G. R. 1928. The early development of the chondrocranium ofSalmo fario. Quart. J. Micros. Sci., 71 (282, N. S.): 259–312.
3. Dingerkus, G. and L. D. Uhler. 1977. Enzyme clearing of alcian blue stained whole small vertebrates for demonstration of cartilage. Stain Tech., 52(4): 229–232.
4. Gamo, H. and I. Terajima. 1963. The normal stages of embryonic development of the medaka,Oryzias latipes. Japan. J. Ichthyol., 10 (2/6): 31–38. (In Japanese.)
5. Goodrich, E. S. 1930. Studies on the structure and development of vertebrates. Macmillan & Co., New York, 873 pp.