256 Transactions. 
Gonangia, female, very large, ovate, tapering below, membranous, 
borne on stem at side of hydrothecae, with a pedicel of about two short 
joints ; several large sarcothecae around base: male, very small, ovate, 
borne on hydrocladia at sides of internodes just below hydrothecae, not 
provided with sarcothecae. 
Loc.— Cape Maria van Diemen, ten miles north-west, 50 fathoms. 
Ета. 13.—Thecocaulus heterogona n. sp. x 80. 
rather longer one, bearing a sarcotheca ; the rest are alike, no intermediate 
ones being normally present, and no sarcothecae except the usual three 
general rule in Thecocaulus. Instead of the stout, rigid, curved process 
usually seen, we have here a narrow-based form, not very different from 
