1903] On the Nenierteans of Norway. 17 



Alimentary canal. The mouth is not large. The oesophagus is 

 comparatively short, though the anterior portion of the intestine 

 is unprovided with pouches. 



The vascular system presents a well-marked dorsal cephalic lacuna 

 which is but slightly broken up by muscle strands. The 

 oesophageal network terminates with the oesophagus, at which 

 level also the exeretory system ends, and the dorsal vessel 

 leaves the proboseis sheath. 



The exeretory system commences shortly after the posterior edge of 

 the mouth. In one of the two specimens available for section 

 cutting the exeretory system was well developed and there 

 were three ducts on one side and four on the other (Pl. fig. 20). 

 In the other speeimen, which was smaller, the system was 

 poorly developed and no ducts were to be found. 



The nerrous system is well developed and the dorsal lobe of the 

 dorsal ganglion is very large. The dorsal ganglion is not 

 much larger than the ventral in section. The head slits in 

 the region of the brain are each about Vs of the transverse 

 diameter of this part of the head. They end abruptly just 

 before the cerebral organs. Frontal organ, head glands, and 

 eyes are all absent. The buecal nerves anastomose just behind 

 the mouth forming a cicumoesophageal ring. 



8. Linens einerens n. sp. 



Locality. Pysfjord (between lat. 68° and 69°). From depth of 500 

 metres on coral bottom (Lophohelia). Temp. .6° C; salinity 

 35.11 %. 



Oceurrence. About half a clozen for the most part complete spe- 

 cimens. Hence probably fairly common. 



External features. A råtner short and stoutly built form. After 

 preservation the average length was from 6 — 8 cm. with a 

 width of 3—1 mm. The body tapers somewhat towards 

 the hind end. No caudicle present, Colour of form ol 

 specimens pale in the intestinal region, light grey on the 

 dorsal surface of the oesophageal region, and with black patch, 

 variable in size, on the upper and lower sin faces of the suout. 

 When transferred to alcohol all the colour is dissolved out 

 with the exception a grey patch above and below the snout. 



