APPENDIX. 393 



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

 each internode on the pinnae. The stem is also indistinctly 

 divided into internodes, from each of which a single pinna 

 is given off alternately on opposite sides, and besides 

 the pinnse there are three cells on each internode, 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, month 

 circular, looking directly upwards. Margin entire, ex- 

 panded. O^dcells long-ovoid, mmicate, spines numerous 

 crowded, mouth prolonged, tubular. 



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

 fathoms. 



Colour dark grey, almost black. Stem two to three 

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

 from a mass of intertmned 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 peculiar 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. loculosa, n. sp. 



D. distans?, Lamoiu'oux. 



Cells completely adnate to each other, each apparently 

 divided into two compartments by a transverse constric- 

 tion. Upper half turned horizontally outwards. JNIouth 

 roundish, irregular, contracted : looking outwai'ds, and a 

 little downwards. O^dcell — ? 



Hab. — Bass Strait, 45 fathoms. 



Colour deep brown ; polypidom simple mibranched (?) 

 about half an inch high, parasitic upon a broad leaved 

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

 one triangular body, which appears as if divided into five 



