"Sphaeroma serratum (Fabricius), for which the genus Sphaeroma was instituted by Bosc, has the maxillipeds differently constructed from those of almost all the later species, in regard to which these appendages have been described, for, while in those species the fourth, fifth and sixth joints are all produced into conspicuous lobes on the inner side, in the original species there are no such lobes. The species now to be noticed has the fourth and fifth joints very slightly lobed, but the sixth not at all. It therefore occupies an intermediate position between Exosphaeroma and Sphaeroma, yet so much nearer to the former than to the latter that it cannot well be left in the genus to which Dana assigned it."
