24 6 DISCOVERY REPORTS 



The armature consists of a main stylet and two accessory stylet reservoirs each with 

 two stylets. 



The vascular system is of the usual type— two lateral vessels and a dorsal vessel above 

 the gut. In the brain region the laterals are above the lateral nerves, but just behind the 

 brain they pass below and continue beside the gut (Fig. 18A). 



There is a convoluted excretory tubule on each side close behind the ganglia opening 

 above the lateral nerves. 



The ganglia are large in proportion to the size of the animal. Both commissures are 

 thin. The fibres of the dorsal ganglia (lower posterior angle) continue into the lateral 



A 



Fig. 18. Oerstedia metadata, n.sp. A, transverse section of the body in the region of the stomach and 

 anterior caecum; B, part of a transverse section of the head, highly magnified, to show the double eyes. 



nerves and retain their individuality down the body. They are separated from the 

 ventral fibres by cellular tissue. The lateral nerves unite before the anus above the gut. 

 There are ten nerves in the proboscis. 



The cerebral organs are small sacs lying a long way in front of the brain, each with a 

 short narrow canal leading to the exterior on the ventral surface near the proboscis pore. 

 There is no external furrow. 



The eyespots are double (Fig. 18B). The anterior pair is close behind the cerebral 

 organs and the posterior pair directly in front of the dorsal ganglia. 



The specimen sectioned was a male with ripe sperm. 



