128 B. C. PUNNRTT. 



throughout, though small side-folds could be made out. The 

 snout is rather sharply pointed. The head slits do not extend 

 beyond the commencement of the mouth, except as very 

 shallow depressions. A small caudal appendage is present. 

 The colour in life was bright red, and is fairly well preserved 

 in a glycerin specimen. 



The epithelium contains small, non-staining, unicellular 

 glands in its outer portion, and also small deeply-staining ones 

 nearer the basement membrane. A circular muscle layer 

 cannot be made out in the cutis, and the longitudinal layer 

 (fig. 22, mlc.) is feebly developed. The composite glands of 

 the cutis {cgl.) are small and rounded, and do not stain 

 appreciably with carmalum. The connective-tissue layer is 

 thick, and contains a few longitudinal muscle fibres. In front 

 of the brain this last layer is small. 



Of the muscle layers, the external longitudinal in the 

 oesophageal region is about twice as thick as either the cir- 

 cular or the internal longitudinal layer, which are of approxi- 

 mately equal thickness. There is a well-marked horizontal 

 layer over the mouth. In the snout the longitudinal fibres 

 are very diffuse. There is no diagonal muscle layer. 



The vascular system is of the usual type, a well-marked 

 head loop being present. The dorsal vessel leaves the 

 proboscis sheath about 4 mm. behind the tip of the snout 

 (fig. 42). 



The alimentary canal presents no special features. The 

 intestine commences about 8 mm. behind the tip of the snout. 

 The ventral gutter is large and the gut pockets small. 

 The proboscis is in all cases missing. 



The proboscis sheath reaches very nearly to the pos- 

 terior extremity. 



The generative sacs contain no sexual cells. 



The excretory system commences at the level of the 



posterior border of the mouth, and extends some way above 



and below the level of the side stems. A single excretory 



pore occurs on each side near the hind end of the system. 



The nervous system is of the ordinary type^ the dorsal 



