158 INVERTEBRATE ZOOLOGY 



2. Order Gnathobdellida. — Mouth large; usually jaws present; no 

 proboscis. Macrobdella, Hirudo, Haemopis, Dina. 



IV. Class Archiannelida. — Marine; no setae or parapodia; segmented 

 internally; no ganglia in nervous system. Polygordius, Protodrilus. 



V. Class Gephyrea. — No segmentation or parapodia; trochophore; 

 introvert. 



1. Order Inermia. — No setae; anus dorsal. Phascolosoma. 



2 Order Armata. — Few setae; anus posterior. Sipunculus, 



Echiurus. 



References 



(See general references cited at close of Chapter I) 

 CLAPERfeoE, E. 1868. "Les Annelides Chetopods du Golfe de Naples." 



Geneva. 

 Fraipont, J. 1887. Le genre Polygordius. Fauna u. Flora d. Golfes 



von Naepel, Monograph 14. 

 Gerould, J. H. 1906. The Development of Phascolosoma. Zool. 



Jahrb., 23: 79-162. 

 Hatschek, B. 1878. Studien iiber Entwicklungsgeschichte der Anneliden. 



Arbeiten Zool. Inst. Wien., 1 : 277-404. 

 Hertwig, O. 1880. "Die Chaetognathen, Ihre Anatomie, Systematik, 



und Entwicklungsgeschichte." Jena. 

 Moore, J. P. 1905. Hirudinea and Oligochaeta collected in the Great 



Lakes Region. U. S. Bur. Fish. Bull, 25: 157-171. 

 Nachtrieb, H. F. Hemingway, E. E. and Moore, J. P. 1912. Leeches of 



Minnesota. Geol. and Nat. Hist. Survey of Minn., Zool. Series, V. 

 Sedgwick, W. T. and Wilson, E. B. 1904. "An Introduction to General 



Biology." New York, Holt. 

 Stephenson, J. 1930. 'The Oligochaeta." London, Oxford Press. 



