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Updated: May 1, 2025
I have spoken of the various hues they assume when in motion, and I will add one word of the peculiarity in their structure which causes this effect. The Ctenophorae differ from the Jelly-Fishes described above in sending off from the main cavity only two main tubes, instead of four like the others; but each of these tubes divides and subdivides in four branches as it approaches the periphery.
In the Ctenophorae, another complication of structure is introduced in the combination of vertical with horizontal tubes and the external appendages accompanying them. But, whatever their differences may be, a very slight effort of the imagination only is needed to transform any one of these forms into any other.
The rapid motion of these flappers causes the decomposition of the rays of light along the surface of the body, producing the most striking prismatic effect; and it is no exaggeration to say that no jewel is brighter than these Ctenophorae as they move through the water.
From the eight branches produced in this way there arise vertical tubes extending in opposite directions up and down the sides of the body. Along these vertical tubes run the rows of little locomotive oars, or combs, as they have been called, from which these animals derive their name of Ctenophorae.
We will first compare the three Orders of Acalephs, Hydroids being the lowest, Discophorae; next, and the Ctenophorae highest. The fact that these animals have no popular names shows how little they are known.
But there is a great difference in the oral apparatus; the elaborate ruffled curtains, that hang from the corners of the mouth, occur only in the Species arising from the transverse division of the Polyp-like young. For this reason they are divided into two Orders, the Hydroids and the Discophorae. The third Order, the Ctenophorae, are among the most beautiful of the Acalephs.
The third and fourth volumes are devoted to the Radiata, and consist of five parts, namely: 1st. Acalephs in general. 2nd. Ctenophorae. 3rd. Discophorae. 4th. Hydroida. 5th. For originality of material, clearness of presentation, and beauty of illustration, these volumes have had their full recognition as models of scientific work.
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