234 



runs along the back, round the tail, past the vent, to 

 the respiratory aperture. Eye rudimentary. Liver 

 reduced to a blind sack of the simple intestine. One 

 genus only, occupying the lowest scale in the class 

 of vertebrata. 



" Found imbedded in sand on many coasts of the 

 temperate regions of both hemispheres.*' 



A sort of BrancMostoma was discovered by the Expedition of 

 the Harold in Bass's Straits, at a depth of from ten to twelve 

 fathoms. Dr. Gunther considers it similar to the European sort 

 (Limax Lanceolatus Pallas). I have not seerj it. 



-*i^§4> 



