208 Annals of the South African Museum. 



pied a tube or burrow, the sides of which were lined with mucus 

 and were of a different colour from that of the surrounding mud. 



It belongs to the larger forms, being about 3 feet in length, as 

 near as could be judged, in the expanded condition, and 18 inches 

 when preserved. The colour, as noted below, was in marked 

 contrast to the bright and conspicuous yellow of the Cape species, 

 and it had a peculiar odour entirely absent in the latter. 



The following is a description of the external features of these two 

 new species, with a few notes on their more important anatomical 

 features. 



PTYCHODERA PROLIFERANS, n. sp. 



Proboscis. In a specimen of an average size (88 mm.), the 

 proboscis was about 4 mm. in length and 3 in breadth, of a 

 bright lemon yellow colour with a tinge of red. 



Collar. Of about the same length as the proboscis, with a distinct 

 posterior furrow, but otherwise quite smooth ; it was of a uniform 

 yellow colour. 



Branchio-genital region. About 20 mm. in length ; the genital 

 pleurae are in contact at the collar, and also meet over the gill 

 region. The gonads are of a bright lemon-yellow, and appear to be 

 continued on to the end of the tail, so that in extreme expansion the 

 animal, posterior to the collar, appears as two bright yellow bands, 

 between which the faintly coloured alimentary canal appears. 



Hepatic region. No hepatic cceca are visible externally. 



Caudal region. About 60 mm. in length and somewhat flattened 

 dorso-ventrally. The dorsal nerve chord had no furrow, nor were 

 there any furrows or streaks on either side, though the ventral nerve 

 chord was situated in a distinct groove extending from the collar to 

 the end of the tail. The glandular patches which in most species 

 form rings round this part of the body were indistinct, and often ran 

 longitudinally. The most marked external feature of the animal was, 

 as above mentioned, the extension of the yellow colour of the gonads 

 into the tail region on each side, sometimes slightly interrupted on 

 one side or the other, but usually continuous. 



A more detailed examination of a specimen showed that there was 

 one proboscis pore, four nerve roots followed by the septum, gullet 

 divided, no long " notochord," pericardium simple, and synapticula 

 present. 



Section of the tail region showed on each side a mass of small 

 spheres or globules readily stained with eosin. These were quite 

 similar to the masses of a similar nature which form part of the 



