69 



segmental grooves aud dorsal pores; at its ventral side it pre- 

 sents a deepeaed quadrangular area , extending over segments 

 XVI — XIX , in wbich several grooves of a singular shape are 

 to be seen. At its anterior and posterior border the area is 

 bounded by a narrow groove, which in the lateral angles shows 

 an oval enlargement; at its right and left side the area is 

 surrounded by a brace-shaped furrow. In the anterior and the 

 posterior half of the area on each side of the median line an 

 arched groove is situated with its concavity directed laterally. 

 These grooves on each side are connected by a shallow furrow 

 and contain the pores of the prostata-glands. Moreover between 

 the niesial grooves and the lateral ones, in each lateral half of 

 the area another curved furrow is visible. Male pores could 

 not be recognized. 



Each prostata consists of a folded , glandular tube , termina- 

 ting in a slender muscular duet, which forms a loop, before 

 opening on the exterior, close to the sac , containing the penial 

 setae. This sac is situated at the innerside of the prostata and 

 is connected with the body-wall by a muscle-fascicle , which is 

 inserted next to the dorsal median line. Each sac appears to 

 contain only a single penial bristle (fig. 2) ; it is of a gold- 

 yellow colour and measures 3 ram. in length. The iuternal ex- 

 tremity of the seta is thickened , the external one thinner ; both 

 extremities are bended to the same side. The distal part of the 

 seta, over about 'A of its total length, is furnished with curved 

 markings , giving it a serrated appearauce ; at its tip it forms a hook. 



There are two pairs of large spermathecae (fig. 3). Each sper- 

 matheca is divided by a constriction in two compartments , a 

 proximal one , forming a thinwalled , pyriform pouch , and a 

 distal one, consisting of a long, cylindrical duet with a thick 

 muscular wall. At its inferior end this duet is somewhat dilated 

 and connected with a small, pyriform diverticulum. 



The internal anatomy of B. congica shows no characteristical 

 pecularities. The lOth — Id^^ septum are very thick and muscu- 

 lar. The intestinal canal , as usually, possesses two gizzards, se- 



