90 THE PINEAL ORGAN 



the dorsal surface of the glass-like cuticle or " Lorica " ; in a few cases 

 there is in addition to the dorsal ganglion (which is supra-oesophageal in 

 position) a small ventral ganglion which is infra-oesophageal. Compare 

 Fig. 57, showing a longitudinal section of a typical rotifer, with Fig. 68, 

 Chap. 1 1, p. 106, which represents a similar view of Lepidurus. It may be 

 noted that in Lepidurus there are paired lateral eyes in addition to the 

 median eyes. 



