10 R. C. Punnett. [No. 2 



The lateral rhynchocoelomic vessels are well marked. 

 Both in the oesophageal and intestinal regions the epithelium 

 of the blood vessels is very thick. 



The excretory system is well developed. Over the hinder Vs of 

 its total extent the duct alone is found. This eventually 

 op ens dorso-laterally on either side. The excretory tubules 

 do not project as small tufts into the blood vessels in the 

 way tliat usually obtains in this genus. 



The gonads are found in two rows on either side opening on the 

 dorsal surface in the intestinal region (Pl. I, fig. 13). The 

 specimen obtained was a young male. 



The nervous system is of the usual Carinellid type. the most no- 

 teworthy feature is an unusually well developed cerebral or- 

 gan. It occurs just behind tlie brain and in section is of 

 about the same size as the side stem at this level. 



The ciliated canal is well marked and opens laterally. 

 The organ is provided with a large number of characteristic- 

 ally staining gland cells. The basement membrane is conci- 

 derably broken up in this region to allo.w of the passage of 

 a number of nerves to the epithelium of this region as well 

 as to the organ itself. 



The side organs which characterize many members of the family 

 are apparently not present. There is no noticeable modifica- 

 tion of the epithelium in the .region where one would expect 

 to find them. Nevertheless in the region of the excretory 

 pore there is an area on either side where the basement mem- 

 brane fails and the nerve cord comes into direct contact with 

 the epithelium. 



Head glands and rhynchodaeal glands are both very large and ex- 

 tend to the level where the brain commences. In its living 

 condition this species bears a considerable resemblance to a 

 small Carinella polymorpha. It differs from that species however 

 in many important anatomical features. In C. ambigua the 

 head glands are massive, the cerebral organ is highly spe- 

 cialized and large, the side organ is absent, and there are no 

 muscle crosses between the inner and outer circular muscle 

 layers in the nephridial reginn. In C. polymorpha 1 ) on the 

 other hand head glands are absent, the cerebral organ is 

 small, a well developed side organ is present, as also are 



!) BURGER, Die Nemertmen, Naples monograph 1895, P. 518. 



