NEMERTEANS 



263 



and two accessory stylet reservoirs with one or two complete stylets and a number 

 of fragments. The rhynchocoel extends to the posterior end of the body. The vascular 

 and excretory systems are similar to those of A. lecointei. 



The brain is small. The dorsal ganglia are considerably larger than the ventral 

 and lie immediately over them. At the posterior end of the ventral ganglia the 

 lateral nerves are given off sharply at right angles to the long axis of the body 

 ( Fi g- 37)- They appear to double upon themselves again just after turning down 

 the body. The twists are vertical, instead 

 of lateral as described in A. moseleyi, and 

 are plainly the effects of contraction. The 

 cerebral canals are short. Their openings 

 are ventral and lateral into a deep circular 

 groove near the tip of the head; The 

 organs themselves are large and closely 

 applied to the sides of the dorsal ganglia, 

 but posteriorly they push between dorsal 

 and ventral ganglia and extend back 

 beyond the former. 



Fig. 38. Amphiporus marioni, Hubrecht. Transverse 

 section of the body at about half its length. In, lateral 

 nerve; ov, gonad. 



The generative sacs (female) are both dorsal and ventral to the gut branches and the 

 nuclei of the ova contain a deeply staining nucleolus. The "paranuclei", as described 

 by Hubrecht (1887), are present. 



The features that have caused a distinction to be made between this species and 

 A. gerlachei, Burger, which it closely resembles when preserved, are the number of 

 nerves in the proboscis and the colour. A reddish worm would undoubtedly have been 

 separated from the specimens of A. moseleyi on capture. 



Amphiporus moseleyi, Hubrecht, 1887 (Plate XVI, figs. 3, 18; Fig. 39). 



Amphiporus Racovitzai, Burger, 1904 a. 



This species (N 4) was very common in King Edward Cove and round the coast of 

 South Georgia. Almost every kelp root sheltered one or more specimens, and a con- 

 siderable range in colour and size was observed. The largest specimen was 10-2 cm. 

 long and 12-0 mm. broad. Specimens were also taken at the following stations: 



St. 123. 15. xii. 26. OTL, 230-250 m. 



St. WS219. 3.V1. 28. NCS-T, ii6-ii4m. (N 79). 



St. MS 67. 28. ii. 26. BTS, 38 m. 



Form and colour in life. The usual length is 5-6 cm. and the breadth 7-8 mm. The 

 body is stoutly built and considerably flattened. The ventral surface is flat and forms a 

 broad "sole". The dorsal surface is convex, especially anteriorly where a longitudinal 

 hump marks the presence of the muscular proboscis. There is no distinction of head 

 from body, but the head end is rather less blunt than the tail. In outline the body 

 resembles a willow leaf. No cephalic slits or eyespots are visible. The opening of the 



