Anatomy and Histology of a New Earthworm. 71 



FAMILY LUMBKICIDiE. 



Genus Tetragonurus, Eisen. 



(Ofv. af K. Vet.-Akad. Forh., 1874, No. 2, p. 47.) 

 Prostomium only partly dividing the buccal somite. Out- 

 lets of vasa deferentia in somite 12, Intervals between the 

 four doul)le rows of seta; about equal. Body cylindrical 

 anteriorly ; quadrate in section posteriorly. 



Tetragonurus pujM, Eisen. 



2'. ptipa, Eisen, Ofv. af K. Vet.-Akad. Forh., 1874, No. 2, p. 47. 



Somites 40. Clitellura on somites 18-22. Tubercula pu- 

 bertatis on somites 19, 20, and 21. Length, 25 mm. Niagara, 

 Canada (Eisen). 



GeNTTS AlLOLOBOPHORA, ElSEIf. 



( Ofv. af K. Vet.- Akad. Forh., 1873, No. 8, p. 46.) 

 Prostomium not completely dividing the buccal somite. 

 Outlets of vasa deferentia in somite 15. Setce in pairs or 

 separated. 



AUoIobophora boeckii, Eisen. 



Lumhricus ptiter, Eiseu, Ofv. af K. Vet.-Akad. Forh., 1870, p. 959. 



Dendrobwna b(£ckii, Eisen, ib., 1873, No. 8, p. 53. 



AUoIobophora hcecMi, Rosa, Lumbricidi del Piemonte, 1884, p. 48. 



Set» in four nearly equidistant rows, the dorsal interval 

 a little the largest. Somites 80-95. Clitellum on somites 

 29-33. Tubercula pubertatis on somites 31, 32, and 33. Length 

 of living examples, 30-40 mm. Newfoundland (Eisen). 



AUoIobophora riparia^ Hoffm. 



Lumhricus riparius, Hoffm., Arch. f. Naturg, 1843, p. 189. 

 AUoIobophora chlorotica, Rosa, Lumbricida del Piemonte, 1884, 

 p. 34. 



Dorsal pores beginning between somites 3 and 4. Seta3 of 

 pairs close together. Somites 80-100. Tubercula pubertatis 

 on somites 31, 33, and 35. Clitellum on somites 29-37. Length 

 50-80 mm. California (Eisen.) 



