ANATOMICAL STRUCTURE OF KERRIA. 3II 



blood is dark red. The vessels in the oesophageal diver- 

 ticulum are less regular and parallel than in Ocnerodrilus, 

 and some of them even branch and give off small 

 secondary projections. They are fewer than in Ocnero- 

 drihis Beddardi, more resembling those of Ocnerodrilus 

 occidentalis. They do not anastomose. They collect in 

 the distal end to a vascular trunk which runs for- 

 ward as in Ocnerodrilus, but is much smaller and less 

 developed. The lateral longitudinal trunk gives off 

 branches to the septal glands in the usual way. The 

 dorsal and ventral vessels send off secondary vessels to 

 the dermal system, in almost precisely the same manner 

 as in Ocnerodrilus and these vessels do not connect with 

 each other, but branch on the body-wall respectively on 

 the upper and lower sides of the body. The elaborate 

 capillary system, which in Ocnerodrilus occupies the 

 anterior two somites, is in Kerria somewhat less devel- 

 oped. But the intestinal vascular system in somites ix 

 to XX is much stronger than in Ocnerodrilus, the blood 

 sinuses and vessels sometimes approaching the hearts and 

 dorsal vessels in size and quantity of blood. 



Kerria zonalis n. sf. 



Figs. 12, 13, 29 and 30. 



One pair of spermathecee in somite ix. Eight prostates, 

 two and two opening close together in each end of the 

 genital zone. The outer sette in the inner couples in 

 somites xvii and xix are missing. 



Habitat. In the same locality as the preceding 

 species. Only one specimen found. 



Of this interesting form I can unfortunately not give 

 a complete diagnosis as part of the single specimen was 

 destroyed before I recognized it a separate species. Evi- 

 dently it much resembles the preceding species. The 



