The biological observations w ere done on the Islets of Langerhans of the Teleostei and the results are as follows. 1) In the Teleostei, the islets are found around the gall bladder or along the bile duct, sometimes in the mesentery not far from the duct. 2) With a large principal islet there are some small dispersed islets. 3) The shape of the islet is oval or spherical, the colour is pink or white. 4) The ratio of the weight of the principal islet to the weight of the fish body lies in 1.0/10^5～2.0/10^5 and the correlation coefficient between them is γ=+0.82.
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