. Contributions to the natural history of the United States of America. Zoology; Chelonia (Genus); Ctenophora; Cnidaria; Animals. 288 CTENOPIIORiE. Pakt II. Fj 101 Pandora the rows of locomotive flappers lie in a furrow, the margins of which may close over them. They differ farther from Pandora in the more extensive development of the rows of flappers, which reach near to the oral tube, and in this respect they resemble more Idyia, with which they agree also in being much compressed laterally. The circumscribed area is bounded by a fringe of deeply lobed processes arranged in two prolonged cir
. Contributions to the natural history of the United States of America. Zoology; Chelonia (Genus); Ctenophora; Cnidaria; Animals. 288 CTENOPIIORiE. Pakt II. Fj 101 Pandora the rows of locomotive flappers lie in a furrow, the margins of which may close over them. They differ farther from Pandora in the more extensive development of the rows of flappers, which reach near to the oral tube, and in this respect they resemble more Idyia, with which they agree also in being much compressed laterally. The circumscribed area is bounded by a fringe of deeply lobed processes arranged in two prolonged circles, with the eye-speck between them, in the centre. The eye-speck is not raised on a peduncle. The branching tubes penetrating into the spherosome, Avhich Eschscholtz does not mention in Pandora, are even more distinct than in Idj'ia; and those arising from the circular oral tuljc are quite numerous. The main chymiferous cavity, from which arise the chyniiferous tubes, is a globular hollow, situated in the abactinal part of the sphero- some and communicating with the wide digestive cavity through a narrow fissure. The compression of the body is quite striking, and, upon contrasting a lateral and a front view, these species appear rather flat. For this genus I would propose the name of Idyopsis. Idyopsis Clarkii Aij. {Fig. 101). I inscribe this species to my friend Prof. H. J. Clark, to whom I am indebted Fij. 102. for a sketch of its outlines, certain that, when he has an opportunity for examining it leisurely, he will give us a most minute account of its structure. From notes made years ago, it appears that the rows of locomotive flappers have on each side a jjand of yellow and Ijrown stellate dots, and that the edge of the mouth, "â as Avell as the fringes around the circumscribed area, were dotted in the same manner. The digestive cavity is occasionally constricted about half way up its height, and may remain so for a long time, while the mouth is broadly opened, and
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