Elementary text-book of zoology, general Elementary text-book of zoology, general part and special part: protozoa to insecta elementarytextbo00clau Year: 1892 Pii 29S.—Setfe of difTerent Polt/chceta (after Malm^reu and ClapareJe). a, Hooked seta of Sabella crassicornis; h, of Terelella Daniehseni; c, seta with spiral ridge from SthenelaU ; (J, lance-shaped seta of PhyUochretopterug; e, of Sabella crassicornis ; f, ot Sabella pavonlf; g, Composite sickle-shaped seta of Nereis ctiHrifera. forms can be distinguished : hair-setae, hooked-setse, flat-setse (palece), lance-setae, sickle-shaped seta
Elementary text-book of zoology, general Elementary text-book of zoology, general part and special part: protozoa to insecta elementarytextbo00clau Year: 1892 Pii 29S.—Setfe of difTerent Polt/chceta (after Malm^reu and ClapareJe). a, Hooked seta of Sabella crassicornis; h, of Terelella Daniehseni; c, seta with spiral ridge from SthenelaU ; (J, lance-shaped seta of PhyUochretopterug; e, of Sabella crassicornis ; f, ot Sabella pavonlf; g, Composite sickle-shaped seta of Nereis ctiHrifera. forms can be distinguished : hair-setae, hooked-setse, flat-setse (palece), lance-setae, sickle-shaped setae, etc. When the parapodia and their appendages are com- pletely wanting, the setae are embedded in pits in the integument, and are arranged either in one or two rows on either side, that is, in a lateral ventral row on either side, or in a ven- tral row and a dorsal row on either side. In such cases the number of setae is small {Oligo- chceta). The setae may, on the contrary, be pre- sent in great number, so that the integument on either side seems to oe covered with long hairs and setae, and a thick felt of hairs shining with a metallic lustre is distributed over the whole dorsal ^IG. 209.—Anterior end of Polsnoe exfeiiuafa, the first elytron on the left hand being removed (after Cla- parede). The two seta; of the oral segment are visible ; El, Eljtra.
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