IN 1813 AND 1811.
BY
PROFESSOR C. TH. V. SIEBOLD,
VERMES ANNULATE
The Annelids have of late frequently become the subjectof attention to naturalists. They have not only receivedadditions in many new genera and species, but their internalorganization has also been illustrated by numerous observers.
ChiEtopodes branciiiati. —A very copious Memoir onthe intimate structure of the nervous system of the Anne lida has been furnished by Quatrefages (Ann. d. Sc. Nat.tom. ii, 1844, p. 81), in which Eunice sanguined, Sav.,Nereis Beaucondrayi, Aud. et Edw., Glycera Meckelii, Aud.et Edw., Phyllodoce pellucida, Quatr., the genus Glycera,Aud. et Edw., and Aricinella, Quatr., have been the princi-pal subjects of investigation.
The genus Aricinella, instituted by Quatrefages (ib. p.95), is provided, as a head, with a long acuminated ros-tellum, without any appendage, but which supports on itsdorsal aspect two distinct eyes. The same active naturalist(Comptes rendus, tom. xix, 1844, p. 195; or Froriep’s n.Notiz. Nr. 674, p. 215) discovered the auditory organ in anew Amphicora, Ehrenb., consisting of an auditory capsuleprovided with otolithes, and placed on each side of the fore-most segment of the body. According to the observationsof Quatrefages (Comptes rendus, 1844, p. 77; or Ann. d.Sc. Nat. t. i, 1844, p. 17), the vascular system in various