20 R- C. Punnett. [No. 2 



below. In others the dorsal surface was of a dirty dark 

 green colour, the ventral surface being much lighter. The 

 head of the green variety was reddish in tint which that of 

 the red variety was of a much brighter red than the rest of 

 the body. Mouth small and rounded. On either side of the 

 head occurs a row of about 4 rather large eyes. None of 

 the specimens dredged shewed a caudicle, though in several it 

 appeared that it might have been broken off. Among the 

 Nemerteans in the Bergen Museum, which I was able to exa- 

 mine through the kindness of Dr. Appelof, was a specimen 

 shewing a well formed caudicle. Consequently I have placed 

 this species in the genus Micrura. 



The body wall consists of the usual layers. The epithelium rests 

 on a fine basement membrane. Beneath this is found a well 

 marked layer of circular muscle fibrils just external to the cutis. 

 The cutis itself is glandular and devoid of longitudinal muscle 

 fibrils. The longitudinal muscle layer in the oesophagial re- 

 gion is about double the thickness of the cutis and also of the 

 circular muscle layer. The internal longitudinal layer is some- 

 what thinner than the circular muscle layer. 



The proboscis is two layered and contains well developed muscle 

 crosses. The proboscis sheath extends to the hind end of 

 the body. 



The alimentary canal presents no very remarkable features. The 

 oesophagus is short and the intestine commences immediately 

 after the excretory region. The intestinal pouches are com- 

 paratively shallow. The mouth is rather far forward and is 

 partly overlapp ed by the cerebral organs. 



The vascular system, shews in the precerebral region a well marked 

 lacuna instead of a head loop. The oesophageal network 

 extends to the hind end of the oesophagus, ceasing where 

 the intestinal pouches and gonads commence. 



The excretory system makes its appearance at the level of the 

 posterior border of the mouth. The tubules extend through- 

 out the oesophageal region. Several ducts (3 — 7) occur on 

 either side chiefly from the posterior portion of the system- 

 Some of these ducts are generally rudimeutary. The tubules 

 do not extend ventral to the level of the nervous side stems. 



The bram is well developed, the dorsal ganglion being considerably 

 larger than the ventral. The b uccal commissure is very strong. 



