()10 



"Borsten in 4 Biindeln, geracle, zu 2 im Biindeln und dann gleich 

 lang oder zu mehreren und dann die inneren des Biindeln mehr oder 

 weniger regelmassig paarweise und Stufenweise als die aussern. 

 Riickenporen mit Verschlusszellen meist vom 7., selten vom 6. Segm. 

 an vorhanden. Kopfporus meist klein, dorsal zwischen Kopflappen 

 und I. Segm. Lymphkorper von zweierlie Gestalt. Peptonephridien 

 stets vorhanden. Der Oesophagus geht allmahlich in den Mitteldarm 

 iiber. Das Riickengefass entspringt meist postclitellial. Blut farblos. 

 Nephridien meist mit grossem Anteseptale, in dem der Flimmerkanal 

 schon Windungen beschreibt. Samenleiter lang. Samentaschen meist 

 mit dem Darm kommunizierend, einfach oder mit Divertikeln." 



Eisen ('05, p. 106) extended the definition by adding the follow- 

 ing characters : "Penial bulb without interior muscular strands." . . . 

 "The intestine in the vicinity of the clitellum contains specialized chy- 

 lus cells." It remains for future investigation to show whether or not 

 these characters are worthy of generic rank, since in the majority 

 of the species of the genus the penial bulb and the chylus cells have 

 not been studied. 



PRIDERICIA FIRMA U. sp. 



Definition. — Length, 24-33 I'^i"'' Somites, 62-67. Color, whit- 

 ish yellow. Prostouiium blunt. First dorsal pore in VII. Set?e, 

 4-7 per bundle in anterior part ; 4-5 in middle part ; 2 in posterior 

 part. Clitellum on XII-XIII. Lymjphocytes elliptical, abundant. 

 Brain ^4 longer than wide ; anterior margin concave ; posterior mar- 

 gin convex. Peptonephridia branching dendritically. Anteseptal 

 part of nephridium slightly smaller than postseptal part; efferent duct 

 arises from mid-ventral surface of latter, near septum. Spermiducal 

 funnel 1.3 to 1.5 times longer than diameter; duct long, slender, and 

 much contorted, and confined to XII. Spennathecse each with pear- 

 shaped ampulla communicating with digestive tract in V; each am- 

 pulla with 3-4 sessile, unequal, lobular diverticula; duct longer 

 than ampulla, slender, and without glands at ectal opening. 



The characters of the penial bulb and the chylus cells are not in- 

 cluded in the above definition but will be discussed in another part 

 of the paper (pp. 618, 619). 



Described from ten sexually mature specimens. Type and para- 

 types in the collection of the junior author and paratypes in the col- 

 lection of the senior author. 



The specimens which are the basis of this description were found 

 with many others near Urbana, Illinois, in November, 1910, in moist 

 soil under decaying leaves in undisturbed forest land. They were 

 abundant and most of them were sexually mature. 



