APPENDIX. 391 



Cells tubular, nearly half free, divergent laterally at a 

 right angle. Mouth looking directly outwards, border 

 entire, slightly everted. Ovicell — ? 



Hab. — Prince of Wales Channel, Torres Strait, para- 

 sitic upon S. pristis. 



Very like the preceding in habit and size, of which it 

 may possibly prove to be a variety. The cells, however, 

 throughout the whole of the polypidom are of precisely 

 the same character, in each form, and exhibit no interme- 

 diate steps. In the present species the cells are much 

 longer, rather narrower, and the upper half is turned out 

 abruptly at a right angle, whilst in the former they ascend 

 at an angle of 45", and the free portion is much shorter. 

 The branches in both are opposite ; the ovicells are unfor- 

 tunately absent iu each. 



8. <Si. mutulata, n. sp. 



Cells compressed or flattened, from side to side ; some- 

 times angular, lower half adnate, upper half divergent, 

 projecting like 'a bracket. Mouth looking directly upwards, 

 narrow oblong, quadrangular. Ovicells acideate, with 

 strong widely set spines, pyriform depressed. 



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

 fathoms. 



Colour light oHve grey. Polypidom about three inches 

 high, irregularly? branched, branches not opposite. Thecells 

 ai-e distichous, and of a very peculiar form, but varying in 

 some degree according to their situation. The younger (?) 

 ceUs on the secondary branches are flat on the inferior or 

 outer aspect, with two angles on each side, or are qua- 

 drangular ; whilst the ceUs on the stems or older or fertile 

 branches are usually rounded below, or on the outer side, 

 and thus have only one angle on each side. The mouth 

 varies in shape according to the cell ; in the former case 

 being a regular long rectangle, whilst in the latter it is 

 rounded on the outer side. The ovicells are placed in a 



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