VERMES. 1-27 



Hirudinea.* 



Ha?niopis, Sanguisuga, Nephclis, Clepsine. 



Anuelicles. 



Oligochaeta. 



Scoleina. 



Lumbricus, Chajtogastcr, Nais. 

 Haliscolecina. 



Polyophthalmus, Capitella. 



CliEetopoda. 



Vagantia. 



Siphonostoma, Arcnicola, Glycera, Nephthys, rhyllorlocc, Alciopa, 

 Syllis, Nereis, Eunice, Amphinome, Aphrodite, Polynoe. 



Tubicolre. 



Amphitrite, Hemiella, TerebeUa, Sabella, Serpula, Branchioninia. 



The position of the genera Neomenia and Chsetoderina is 

 not yet settled ; but they must not be passed over, on account of the 

 great importance of many points which have been made out in their 

 organisation. Although they differ in not unimportant points from 

 one another they are closely allied, and may be reckoned with the 

 other divisions of the Vermes. I therefore unite them into a division, 

 which I call that of the Solenogastres. It will not be possible 

 to form any safe opinion as to their position till they are known 

 more exactly; and for this knowledge, especially as regards their 

 development, we must wait. 



Bibliography. 



V. Ba.er, Beitriige zur Kenntnias der niedcren Thiere. N. A. Acad. Leop. Carol. XIII. 1826.— 

 Dujardin, Histoire nat. des Helminthes. Paris, 1845. — Van Beneden, Mciinoire sur les vers 

 intestinaux. Paris, 1861. — Leuckart, R., Die menschlichen Parasiten. Leipzig unci Heidel- 

 berg. I. II. 1863-76. — Claparede, Beobachtungen fiber Anatomie unci Entvrickelungsgesehichto 

 wirbelloser Thiere, Leipzig, 1863. 



ON THE SEPARATE CLASSES. 



Flatyhelminthes : Duges, Recherches sur reorganisation et les mceurs des Planaires. Ann. sc. 

 nat. Ser. I. T. XV. ; also Isis, 1830.— Nordhann, A. v., Micrographische Beitriige zur Naturge- 

 schichte der wirbellosen Thiere. Erstes Heft. Berlin, 1S32.— Quatrefages, A. de, Mclmoire 

 sur quelques Planaires marines. Ann. sc. nat. S6r. in. T. IV.— The same, Sur la i'amille des 

 Nchnertines. lb. T. VI.— Schmidt, O., Die rhabdocolen Strudelwiirmer. Jena, 1818.— The 

 same, Neue Beitriige zur Naturgeschichte der Warmer. Jena, 1848.— The same, Ueber Rhab- 

 docolen. Wiener Sitzungsbericht. Math. Naturw. Classe. Bd. IX. S. 23. — The same, 

 Ueber Dendrocolen. Zeitschr. f. w. Zoologie. X. XL— Van Beneden, Les vers cestoides. 

 Mt'moires de l'Academie de Bruxelles. XXV." 1850.— The same, Recherches sur la faune littorale 

 de Belgique, Turbellaries. lb. XXII. I860.— Leuckart, R, Mesostomum Ehrenbergii. Arch, 

 fiir Nat. 1852. S. 234.— Schultze, M., Beitrage zur Naturgeschichte der Turbellarien Greif swalde. 

 1851.— The same. Ueber die Microstomeen. Arch. f. Nat., 1849. S. 280.— Wagenee, G., Die Ent- 

 wickelung der Cestoden. N. A. L. C. T. XXIV. Suppl. 1854.— The same, Beitrage am- Ent- 

 wickelungsgeschichte der Eingeweiflewurmer. Haarlem, 1857. — Stieda, Beitr. z. Anat. v. Both- 

 ryocephalus. Arch, f. Anat. u. Phys. 1864.— Somher and Landois, Beitrage z. Anat. d. Platt- 

 wiirmer. Zeitschr. f. wiss. Zool. 1872.— Schneider, A., Ueber Platyhelminthen. Giessen, 1873 



* I would place the genus Brauchiobdclla, which is counted as one of the 

 Hirudinea with the Scoleina among the Annelides. There is nothing leech-like in the 

 organisation of this worm except its sucker and jaws; and these parts are really 

 structures which are due merely to its parasitic mode of life. 



