mut. mutand.

Already it will have been seen that M. de Pourtales found this (for Stelletta (Tisiphonia) agariciformis of Schmidt appears, mut. mutand., to be identical with it) in 178 fathoms; so that here we have a sponge, in form and habitat respectively, connecting the Pachytragiæ of the shore, through the Coralliospongiæ, with the Calycispongiæ (Kent) of the deepest seas.