. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. OPHIACANTHIDAE 253 Some of the specimens are infested by the ectoparasitic Copepod Cancerillopsis, one of them (St. 599) by the entoparasite Ophioika. There cannot be the sUghtest doubt that Koehler's Ophiodiplax disjuncta is identical with the species described by him in 1901 under the name Ophiacantha antarctica. From the descriptions and figures this is indeed quite evident; it is true the division of the dorsal arm plates was not observed by Koehler in his O. mitarctica, but in a co-type sen
. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. OPHIACANTHIDAE 253 Some of the specimens are infested by the ectoparasitic Copepod Cancerillopsis, one of them (St. 599) by the entoparasite Ophioika. There cannot be the sUghtest doubt that Koehler's Ophiodiplax disjuncta is identical with the species described by him in 1901 under the name Ophiacantha antarctica. From the descriptions and figures this is indeed quite evident; it is true the division of the dorsal arm plates was not observed by Koehler in his O. mitarctica, but in a co-type sent me from the Brussels Museum I find them very well developed. No further dis- cussion on the question of the identity of the two "species" is needed. It is curious that Koehler, in recording both O. antarctica and Ophiodiplax disjuncta in his work of 1912 did not notice their 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,
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