2 66 



DISCOVERY REPORTS 



brain, but anteriorly they fill the head. The oesophagus joins the rhynchodaeum very 

 close to the external opening and is from this point lined with the deeply staining cells 

 characteristic of the stomach. Its walls are folded (Fig. 43). I could see no eyespots in 

 the cleared specimens nor were any evident in the sections. There are no cerebral sub- 

 epithelial glands, but there are cutis glands in the longitudinal muscles. 



The basement layer is very thick and stains lightly. The epithelium in all the speci- 

 mens is much wrinkled but apparently it is not much thicker than the basement mem- 

 brane. The circular muscles are less than half as thick. The longitudinal layer is well 

 developed but does not show the pennate arrangement of bundles so noticeable in 



Fig. 42. Amphiporus 

 scoresbyi, n.sp. Sketch 

 of a preserved speci- 

 men, x 8 approx. 



Fig. 43. Amphiporus scoresbyi, n.sp. Section, slightly 

 oblique, across the brain region, ac, lateral branch of 

 the anterior caecum; bm, basement layer; cm, circular 

 muscle layer; co, cerebral organ; ep, epithelium. 



A. marioni and other species. The proboscis is stout. It has twelve nerves and the 

 accessory armature consists of two reservoirs each with two or three stylets. The main 

 stylet could not be seen. 



Two lateral branches of the anterior caecum extend forward and end above the brain 

 (Fig. 43). The excretory tubules, as usual, lie between the cerebral organs and the 

 branches of the anterior caecum. The efferent duct is continued back above the lateral 

 nerve and opens laterally much nearer the tail than the head. 



The brain is of fair size, both ganglia being nearly equal. The cerebral organs open 

 by a fine canal laterally and run in towards the brain obliquely back. The organs wedge 

 themselves between the ganglia and protrude posteriorly beyond the dorsal ganglia with 

 which they have nervous connections. The lateral nerves are not much flattened in the 

 body. They join above the anus. 



The sex of the sectioned specimen could not be determined. 



Amphiporus spinosus, Burger, 1893 (Plate XVI, fig. 22; Figs. 44, 45). 



A. spinosissimus, Burger, 1893; A. cruciatus, Burger, 1893; A. multihastatus, Joubin, 1914. 



This species could nearly always be found in kelp roots. Three types were originally 

 described under N 3, N 16, N 20, the different sizes, number of eyespots, colour and 



