Text-book of comparative anatomy . FIG. i.:,4.—Section through the eye of Sag-itta hexaptera, after O. Hertwig. c//, Bodyepitheliuni; ?, lens ; p, pigment; ft rods ; ?-,retinal cells. p. 227).simple C. Olfactory Organs (Ciliated Organs). In many worms of the Xf/iir/iian and Clmtopodan divisions thereare found, at the anterior end of the body, 2 lateral strongly ciliated 232 COMPARATIVE ANATOMY CHAP. parts of the hypodermis, the so-called ciliated organs, ciliated clefts,ciliated pits, ciliated prominences, which are regarded as olfactory.

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Keywords: ., bookcentury1800, bookdecade1890, booksubjectanatomycomparative