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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.
In the Hydroid-Medusae and Discophorae, instead of a simple digestive sac, as in the Hydroids, we have a cavity sending off tubes toward the periphery, which ramify more or less in their course.
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.
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.
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