252 INVERTEBRATE MORPHOLOGY. 



2. Order Rhynchobdellidce. Without teeth and with protrusible 

 pharynx. Clepsine, Pontobdella, Piscicola, Branchellion. 



III. Class GEPHYKEA. Metamerism indistinct ; without parapodia. 



1. Order Echiurece. With seise. Echiurus, Thalassema, Bo- 



nellia. 



2. Order Sipunculacece. Without setae. Sipunculus, Priapu- 



lus, Phascolosoma, Phascolion. 



IV. Class MYZOSTOMEvE. Parasitic on Crinoids ; approximating a radial 



symmetry. Myzostoma. 



APPENDIX. 



Class PHORONID^;. Without metamerism ; tubicolous ; with lophopnore. 

 Phoronis. 



LITERATURE. 



CH^ETOPODA. 



A. de Quatrefages. Histoire naturelle des Anneles marins et d'eau douce. 



Paris, 1865. 



E. Ehlers. Die Borstenwurmer. Leipzig, 1864-68. 

 E. Meyer. Studien iiber den Korperbau der Anneliden. Mittli. a. d. zoolog. 



Station zu Neapel, vn, 1887 ; vm, 1888. 

 H. Eisig. Die Capitelliden des Oolfes von Neapel. Fauna und Flora des Qolfes 



von Neapel. Monogr., xvi, 1887. 

 J. Fraipont. Le genre Polygordius. Fauna und Flora des Golfes von Neapel. 



Monogr., xvi, 1887. 



E. Claparede. Recherches anatomiques sur les Oligocfietes. Geneve, 1862. 



F. Vejdovsky. Monographic der Enchytrmden. Prag, 1879. 



- System und Morphologie der Oligochccten. Prag, 1884. 

 Numerous papers on Oligockseta by G. E. Beddard and W. B. Benham in 

 Quarterly Journ. Microscop. Science. 



HIRUDINEA. 



A. Moquin-Tandon. Monographic de lafamille de Hirudinees. Paris, 1846. 

 C. 0. Whitman. The Leeches of Japan. Quarterly Journ. of Microscop. Science, 



xxvi. 1886. 



The Metamerism of Clepsine. Festsclir. zum siebenzigsten Geburtstage 

 Rudolf Leuckarts. Leipzig, 1892. 

 A. G. Bourne. Contributions to the Anatomy of the Hirudinea. Quarterly 



Journ. of Microscop. Science, xxiv, 1884. 



GEPHYREA. 



R. Greef. Die Echiuren (Qephyrea armata). Nova Acta Leopol. Carol. Akad., 



XLI, 1879. 



E. Selenka. Die Sipunc.uliden. Wiesbaden, 1883. 

 E. A. Andrews. Notes on the Anatomy of Sipunculus Gouldii, Pourtales. 



Studies from the Biolog. Labor. Johns Hopkins Univ., iv, 1890. 



