. Fig. 7. Ophiacantha disjuncta (Koehler). Part of oral side of two specimens, showing variation in the development of the mouth papillae. X12. The name antarctica, though the older of the two, cannot be used for the species, as there already is the Ophiacantha antarctica (Lyman) originally referred by Lyman to Ophioconis, but quite evidently an Ophiacantha; thus the name disjuncta has to be used for this species. As for the genus Ophiodiplax, Hertz has rejected it and included the species in the genus Ophiacantha, and I quite agree that the characters of the divided dorsal plates and the more
. Fig. 7. Ophiacantha disjuncta (Koehler). Part of oral side of two specimens, showing variation in the development of the mouth papillae. X12. The name antarctica, though the older of the two, cannot be used for the species, as there already is the Ophiacantha antarctica (Lyman) originally referred by Lyman to Ophioconis, but quite evidently an Ophiacantha; thus the name disjuncta has to be used for this species. As for the genus Ophiodiplax, Hertz has rejected it and included the species in the genus Ophiacantha, and I quite agree that the characters of the divided dorsal plates and the more or less conspicuous continuation of disk spinules on to the dorsal side of arms do not afford sufficient basis for making the species the type of a separate is, however, another character which might be of generic value—the multiplication of the mouth papillae. In some specimens there are a great number of papillae, placed mainly below the normal ones inside the mouth slits (Fig. 7^); more generally there are only a few of these supernumerary papillae (Fig. 76), sometimes only one, very rarely none. As pointed out by Koehler in his description of O. antarctica this recalls Verrill's
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