16 Annals of the SoittJi African Museum. 



consistency, and is thickly encrusted with sand-grains. The speci- 

 mens are 360 mm. (of which the tail is 135 mm.) and 250 mm. (of 

 which the tail forms 90 mm.) long respectively, and about 12 mm. 

 in diameter at their widest part ; that is, they are more slender than 

 the specimens already described. The tail segments are very 

 numerous, namely, about 205 and 186 respectively. The outlines 

 of the prostomium are not well shown, but the other external features 

 the annulation, the parapodia, the number and position of the 

 nephridiopores, the number and nature of the gills, the characters of 

 the notopodial setas are sufficiently well preserved to permit their 

 agreement with those of the specimens described in the preceding 

 pages to be certainly ascertained. The capillary setaa in particular 

 present the well-marked striation and " Sageblatter " characteristic 

 of A. loi-cni. The larger specimen was examined internally, and 

 found to possess the two enormous septal pouches diagnostic of 

 .4. lovcni. This being sufficient, with the external features already 

 noticed, to fully determine the species, an examination of the 

 remaining organs, which are in defective condition, was not 

 attempted. 



DIAGNOSIS OF ARENICOLA LOVENI KINBERG. 



The characters of this species may be given thus : Caudate Areni- 

 cola with nineteen chtetigerous segments ; thirteen pairs of gills, the 

 first gill on the seventh segment, gills large and pinnate ; the median 

 lobe of the prostomium is large, the smaller lateral lobes are of 

 almost uniform width, i.e., they are not dilated or lobate at their 

 anterior ends ; neuropodia are clearly visible on each segment, those 

 of the branchial and of the two pre-branchial segments are long 

 dorso-ventrally and almost reach the mid-ventral line ; each noto- 

 podial seta bears numerous finely toothed crests or " Sageblatter " 

 at regular intervals along the distal third of the shaft, this part of 

 the seta has a transversely striated appearance, as seen under low 

 magnification ; five pairs of nephridia which open on the fifth to the 

 ninth segments ; one pair of cesophageal glands, conical in shape ; 

 two enormous muscular pouches project backwards from the first 

 septum, pass through apertures in the second septum, and terminate 

 immediately in front of the third septum ; a pair of closed, oval 

 statocysts, each containing a single large, oval, secreted statolith. 

 Type Specimen in the Eiksmuseum, Stockholm. The type speci- 

 men was collected at Port Natal, Durban. The species is now 



