1903] On the Nemevteans of Norway. 29 



Xervous system. For the size of the animal the bram is not very 

 large. At the end of it the side stems bend off sharply at 

 right angles to the long axis of the body. They eventually 

 come to lie in the gelatinous connective tissue near the lateral 

 margins of the body. The cerebral organ op ens on the ventral 

 surface some little way in front of the brain. The organ is 

 exceedingly small (Pl. I, fig. 1) and is provided with but few 

 gland cells. The longitudinal head furrows reach back as far 

 as the brain region. The epithelium lining them cannot be 

 distinguished from that covering the rest of the head (Pl. I, 

 fig. 1). Numerous eyes are found on the lateral margins of 

 the head. The head glands are well marked but small, only 

 extending over about 1 / i of the distance between the anterior 

 extremity and the brain. No lateral cutis glands are present. 



19 Amphipiporus pusillus n. sp. 



Loealities. Herlofjord (near Bergen) from about 100 metres on 

 muddy bottom. 



Lofoten (exact locality uncertain). 



Alverstrøm (near Bergen) from 80 metres on shell sand. 



Oecurrence. Several specimens from each locality. Probably a 

 fairly abundant form. 



External features. Small stoutly built form. Largest specimen ob- 

 tained measured 3 cm. in length and I mm. in breadth when 

 alive (Pl. I, fig, 9). The body is very contractile and after 

 preservation the length of the worm is only from 2 to 3 times 

 its width. Eyes fairly numerous. Their arrangement is shewn 

 on Pl. I, fig. 10. Colour when alive rose pink all over. It 

 is extracted by alcohol. During life the epithelium is very 

 sticky. 



Body watt. The basement membrane is about as thick as the epi- 

 thelium, and at least double the thickness of the underlying 

 layer of circular muscles. The longitudinal laver is well de- 

 veloped. 



The 2 )r °boscis is large for the size of the worm. It contains 12 

 nerves. The base is of the same length as the central stylet 

 and two reserve pockets are present each containing 6—9 

 stylets. The base is also characterised by containing a second 

 stylet imbedded in it (Pl. I, fig. 11). 



