mose setæ at the end of the antenna?, the fine cilia of which he says are perpetually in motion, but he does not mention the finely plumose filaments of the tail: the second pair of antennae he describes as feet. Mr. T. observes that the fin-legs could not be well made out, on account of the minuteness of the animal, but that they appeared pretty numerous.
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Cyclopsina Arietis. The short line shows the natural size. The detached figure represents an abdominal leg.
Inhabits the Atlantic Ocean. I first met with it in lat. 12° 38' N. long. 20° 14' W. on the 21st of May, 1832; and again off the Cape of Good Hope, in lat. 35° 29' S. long. 21° 50' E. when I noticed the male also, which is distinguishable by the swelling and large joint of the right antenna. During the previous night the sea was luminous.
The genus Cyclopsina is constituted by Milne Edwards, to receive those species of the genus Cyclops of Muller, which have the second pair of antennae divided into two branches. The type of the genus is the Cyclops rubens of Muller, the Monoculus Castor of Jurine. The genus Calanus was established by Leach, to receive those species which had no second or posterior pair of antennae, and had the anterior ones very long. The type of this genus is the Monoculus finmarchicus of Gunner. On reference however to the figure of this species given by Gunner, in the Kiobenhavn. Selsk. tom. x. p. 175, fig. 20—23, it appears that a second pair of antennae do exist in it, and as they are found in all the other species resembling it, it is evident that the genus Calanus, as constituted by Leach, cannot stand. I have therefore preferred the genus formed by Milne Edwards.
