The Arenicolidte of South A fried. 15 



to forty triangular processes ; each of these is attached by its narrower 

 end and its broader distal margin is subdivided into six to eight 

 rounded lobes. The ventral lip may be slightly folded but is not 

 frilled or ridged, and is not indented. All the nephridia are about 

 the same size, that is, the first and last do not show any signs of 

 being in process of reduction. 



Gonads. 



The gonad is microscopic, as in A. marina, and the stages of 

 growth of the reproductive cells found in the coelomic fluid are 

 similar to those seen in the coelom of A. marina. 



Central Nervous System and Statocysts. 



The brain and nerve cord are apparently similar to those of 

 A. marina, but, as material suitably preserved for histological work 

 is not available, they have not been studied in detail. Giant nerve 

 fibres are present in the nerve cord, as in all other species of 

 Arenicola, except A. claparcdii. 



A statocyst was found on each side of the type specimen, con- 

 nected to the body wall by a strand of tissue, but it could not be 

 definitely ascertained whether this was a solid cord of nerve and 

 connective tissue or whether it contained a narrow tubular structure. 

 The former seemed more probable, as careful search failed to reveal 

 any external aperture at or near the point where the tissue strand 

 meets the body wall. When the Saldanha specimens came into my 

 hands serial sections were made of a statocyst and the adjacent body 

 wall of one of them, which definitely prove that the vesicle has no 

 opening to the exterior (Fig. 6). The three diameters of the lumen 

 of this statocyst are '22, -2, and -15 mm. respectively. The walls of 

 the organ are thick, they average about "07 mm. in thickness. Each 

 statocyst contains a single round or oval statolith, two * diameters 

 of the one in the serial sections are '088 and -075 mm. respectively. 



REMARKS ON SPECIMENS OF ABENICOLA LOVENI 



FROM FALSE BAY. 



The two specimens found cast up dead on the shore of False Bay, 

 after a storm, are in bad condition ; the body wall has a leathery 



* The third diameter cannot be accurately ascertained. 



