18 R- C. Punnett. [No. 2 



The body ivall is well developed, all the muscular layers being 

 strong. The outer longitudinal layer is from 2 to 3 times 

 as thick as the circular layer. The inner longitudinal layer 

 is also thicker than the circular layer. The epithelium rests 

 on a thin basement membrane beneath which is a fairly well 

 developed layer of circular muscle fibrils. Beneath this again 

 are a few longitudinal fibrils. The cutis is about double the 

 thickness of the epithelium, and is composed for the most 

 part of gelatinous connective tissue in which are imbedded 

 the scanty glands. 



The proboscis contains two muscle layers. Muscle crosses are 

 present. The proboscis sheath only extends through two 

 thirds of the body length. 



In the alimentary canal the oesophagus is not very long, and 

 the intestine is provided with pouches from its commencement. 

 The intestinal pouches are of about the same depth as the 

 width of the central lumen. A few circular muscle are found 

 round the oesophagus. The mouth is of moderate size and 

 its anterior border commences just in front of the level at 

 which the cerebral organ terminates. 



The vascular system presents a cephalic lacuna somewhat bro- 

 ken up by muscle strands. Otherwise the system shews no 

 peculiarities. 



The excretory system extends along the posterior 3 / 5 of the 

 oesophagus. At intervals along the greater part of its extent 

 (Pl. II, fig. 19) ducts are given off. These are usually much 

 attenuated and possibly not functional. The tubules do not 

 reach below the level of the nervous side stems. 



In the nervous system the dorsal ganglion is about double the 

 size of the ventral. The dorsal lobe of the dorsal ganglion 

 is very large and reaches back some way over the cerebral 

 organ, being dorsal and somewhat internat in position to the 

 latter structure. The cerebral organ itself is somewhat small 

 for the size of the worm. The head slits are fairly deep 

 each being about V5 of the transverse diameter of the head 

 in the bram region. The end abruptly where the ciliated 

 canals come off. The median dorsal nerve is large. The 

 buccal nerves form a circumoesophageal ring. Large median 

 dorsal nerve. The frontal organ is well marked. Scanty head 

 glands are present. Yery numerous small eyes are present 



