020 



Pridericia and the subfamily Lnnihricillincc, based on the character 

 of the pcnial bulb. The discussion of the importance of this organ 

 in classification is taken up in detail iu: another ]:)aper to be pub- 

 lished in the near future. 



Speniiatheccc. — Each spermatheca (PI. XCIX, Fig. ii) consists of 

 three distinct parts ; an ampulla, diverticula, and the duct. The am- 

 pulla, the largest part of the spermatheca, is a pear-shaped organ, of 

 which the smaller end is united with the digestive tract in the pos- 

 terior part of V, and the larger end is connected with the body wall 

 by means of the duct. The cavity within conforms somewhat to the 

 external shape of the organ, being rather spacious in the region of 

 the diverticula, and gradually narrowing to the point where it com- 

 municates with the lumen of the digestive tract. The communica- 

 tions of the two spermathec^e with the digestive tract are separate. 

 Three or four sessile lobular diverticula are present on the ectal end 

 of the ampulla. They are somewhat similar in shape but vary in 

 size. The duct originates at one side of the ectal end of the ampulla 

 from a cone-shaped expansion. It is uniform in diameter, about 

 three times as long as the ampulla, and is lined with cuticula through- 

 out its entire length. The ectal opening is lateral in position and 

 near the intersegmental groove IV/V. No accessory glands are 

 present at the ectal opening. The hypodermis of IV and V, with the 

 exception of the dorsal third, is strongly thickened, the thickening 

 being greatest in the vicinity of the spermathecal pores. 

 • 



FridERICia tknKRA n. sp. 



Definition. — Length, 9-17 mm. Somites, 52-59. Color, whitish. 

 Prostomium rounded. First dorsal pore in VII. Setse, 4-6 per 

 bundle in anterior region of body ; 2-4, usually 2, in posterior re- 

 gion. Clitellum on XII and XIII. Lymphocytes elliptical. Brain 

 about one fifth longer than wide; anterior margin concave, posterior 

 margin convex, lateral margins converge cephalad. Peptonephridia 

 each with several branches originating from common base, and some 

 secondary branches. Anteseptal and postseptal parts of nephridia 

 about equal in size; efferent duct arises from mid-ventral surface of 

 postseptal part near septum. Spermiducal funnel about twice as long 

 as wide ; duct long, much contorted, and confined to XII. Spermathecae 

 each with barrel-shaped ampulla communicating with digestive tract 

 in V, and each bearing about seven globular sessile diverticula ; two 

 glands at ectal opening of spermathecal duct. 



For discussion of penial bulb and chylus cells see pages 622, 623. 



