132 



R. 0. PUNNE'lT. 



mushroom-shaped bodies conspicuous by their deep green 

 pigment. They appear to contain numbers of small "rhab- 

 dites." To the naked eye the proboscis shows two longi- 

 tudinal deep green bands in this position. The nervous layer 

 is considerably thickened here. 



The proboscis sheath reaches to within 5 cm. of the 

 posterior end. 



The genital sacs contain nearly ripe ova. 



The excretory system commences about 5 mm. from the 

 tip of the snout, and extends over 7 mm. The excretory 

 ducts are numerous^ there being twenty-two on one side and 

 eighteen on the other. As they pass through the circular 

 muscle layer they show a bladder-like expausion, which 

 disappears when they emerge into the outer longitudinal 

 layer. 



The nervous system is of the usual type, with the 

 exception that the cephalic nerves are very strong and well 

 marked, and are accompanied with a few ganglion cells 

 externally (fig. 18). The median dorsal nerve stands out 

 distinctly from the nervous layer. 



The cerebral organ is very small, and to a great extent 

 overlapped by the dorsal lobe of the dorsal ganglion, which, 

 however, is not well marked, and does not make its appear- 

 ance until after the ciliated canal has entered the brain 

 (fig. 30, c). The gland cells are not numerous, and a separa- 

 tion of a dorsal and ventral portion does not occur. The 

 head slits are very shallow and wide. 



Frontal organ and eyes are absent. 



The head glands are small but compact, and appear to 

 be merely a rather specialised portion of the deeper cutis 

 glands. 



Cerebratulus ins ignis, n. sp. 



Two specimens of this species were procured, one of which 

 was about 7 cm. and the other about 10 cm. long. The 

 shape is rounded, the side folds being small but nuxrked. 

 The mouth is small, and the head slits are continued beyond 



