APPENDIX. 393 



than the other (subaltemate), and one pair is placed on 

 each intemode on the pinnae. The stem is also indistinctly 

 divided into iatemodes^ from each of which a single pinna 

 is given ofif alternately on opposite sides, and besides 

 the pinnee there are three ceUs on each intemode, two on 

 the side from which the pinna springs, and on the oppo- 

 site side alternate in position to the other two. 



12. S. digitalis, n. sp. 



Cells digitiform, slightly curved to the front, mouth 

 circular, looking directly upwards. Margin entire, ex- 

 panded. OviceUs long-ovoid, muricate, spines numerous 

 crowded, mouth prolonged, tubular. 



Hab. — Prince of Wales Channel, Torres Strait, 9 

 fathoms. 



Colour dark grey, almost black. Stem two to three 

 inches high, rising either from a strong main trunk (?) or 

 from a mass of intertwined radical tubes. Stems or 

 branches pinnate : pinnae or branches alternate, straight, 

 divaricate. The cells forming a pair, are, on the branches, 

 adnate to each other throughout their whole length. 

 But on the stem the cells are distichous and wide apart. 

 The ovicells are pecuhar in their long flask-like form, and 

 tubular mouth. They are placed all on one side of the 

 rachis, generally in single file, but sometimes in pairs. 



13. S. loculosu, n. sp. 



D. distans?, Lamoujoux. 



Cells completely adnate to each other, each apparently 

 divided into two compartments by a transverse constric- 

 tion. Upper half turned horizontally outwards. Mouth 

 roundish, irregular, contracted : looking outwards, and a 

 httle downwards. Ovicell — ? 



Hab. — Bass Strait, 45 fathoms. 



Colour deep brown ; polypidom simple unbranched (?) 

 about half an inch high, parasitic upon a broad leaved 

 fucus. The cells are so closely conjoined as to form but 

 one triang-ular body, which appears as if divided into five 



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