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The trophi are very complicated, and there are various details of structure not noticed or not mentioned by any of the writers upon the subject hitherto.

Filamentary appendages, none: labrum, with the upper part highly bullate: trophi, various: olfactory orifices, more or less prominent: caudal appendages, uniarticulate and spinose, or none.

In several of its characters, such as the absence of calcareous valves, the broad blunt end of the peduncle, the spineless cirri, the small size of the trophi, and more especially the absence of transverse stri� in those muscles, which in mature cirripedes are thus furnished, we see that this genus is in some degree in an embryonic condition.

There is quite as close, if not closer affinity to Ibla, in the following peculiarities,—in the curved œsophagus,—in the general character of the cirri and trophi, with the olfactory orifices in one species in some degree prominent,—in the multi-articulated caudal appendages,—and in the plainly-articulated penis, with its elongated unarticulated support, though both these characters are exaggerated in Ibla.

The muscles of the several trophi have transverse stri�, and are the strongest and most conspicuous of any in the body.