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Updated: June 3, 2025
No use is known for any of the other specific characters, which tend in each case to form a series. Thus in size norvegicus is the smallest, unimaculatus larger, and punctatus largest, the last reaching a of 8-1/2 inches. The subcaudal fin-flaps are developed in norvegicus, most in punctatus; each has four rays in norvegicus and unimaculatus, six in punctatus.
This high-principled lophobranch is so careful of its callow and helpless young that it carries about the unhatched eggs with him under his own tail, in what scientific ichthyologists pleasantly describe as a subcaudal pouch or cutaneous receptacle.
On the other hand, it is very probable that this subcaudal extension of the fins is merely a result of the posterior extension and enlargement of these fins which has taken place in the evolution of the adaptation.
The effect of these movements was to pump out water backwards from the space between the body and the surface it was clinging to, and to cause water to flow into this space at the anterior edges of the head. The subcaudal flaps were perfectly motionless and tightly pressed between the base of the tail and the surface of support, so that any movement of them was impossible.
The subcaudal prolongations of the fins are therefore not necessary to the adhesion, nor to the pumping action, of the muscles and fins, which went on as before. It seemed probable, therefore, that the pumping action was itself the cause of the adhesion.
The pythons closely resemble the true boas, but have the subcaudal plates double; the muzzle is sheathed with plates, and those covering the mouth of the jaws have pits. These snakes, which equal or exceed the boas in magnitude, are natives of India, Africa, and Australia.
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