934 
runs along the back, round the tail, past the vent, to 
the respiratory aperture. Eye rudimentaiy. 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 Braneliiostoma was discovered by the Expedition of 
the Harold in Bass’s Straits, at a depth of from ten to twelve 
fathoms. Dr. G-unther considers it similar to the European sort 
( Limax Lanceolatm Fallas) . I have not seen it. 
