The Journal of experimental zoology . Fig. 7. •Spirorhis Pagenstecheri. Ventral (slightly anterior) view showing branchiae and operculum with itsbrood chamber containing embryos ( X 40). f. Group VI. One Operculwn. No Rudimentary members of this group have only one operculum. There isno rudimentary operculum. Examples are Spirorhis, Pileolaria,Ditrupa, Filogranula (.?), Pomatoceros, Vermilia. This group may be further subdivided according as the oper-culum has a position in the line with the branchiae (Ditrupa, 28 Charles

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Keywords: ., bookauthorwi, bookcentury1900, bookdecade1900, booksubjectzoology