394 APPENDIX. 



loculaments by transverse constriction. The upper ap- 

 parent constriction however seems merely to indicate the 

 line of flexure of the upper part of the cell upon the lower. 

 The form of the conjoined cells is not unlike Lamouroux's 

 figure of S. {D.) distans; but the present is clearly not 

 that species. 



14. S. unguiculata, n. sp. 



Cells urceolatCj upper half free^ projectiag in front, and 

 much contracted towards the mouth ; elliptical, with the 

 long axis horizontal, lookiag forwards aud a little out- 

 wards ; two long lateral teeth, the outer the longer and 

 usually incurved. Ovicell ovoid; mouth wide, with a 

 much elevated, thickened border. 



Hab. — rSwan Island, Banks Strait, thrown on the 

 beach. 



Colour bright brown; polypidom pinnate; the stems 

 arising from creeping radical tubes, very thickly intertwined 

 around a long slender body. The stems are from one to 

 four inches long, the pinnae about \ — ^ inch, alternate. 

 The rachis of the stem is divided into distinct intemodes, 

 from each of which are given off two pinnse, and upon 

 which are also placed usually six cells, three on either side. 

 The pinnae are also divided, but less distinctly, into inter- 

 nodes of various lengths. The pairs of cells on the pinna 

 are all secund, and in contact with each other at their 

 bases, though widely divergent above. 



14. S. tridentata, n. sp. 



Cells urceolate, ventricose below, contracted towards 

 the mouth. Mouth looking forwards and outwards, cir- 

 cular, with three acute teeth, two lateral, longer than 

 the third, which is above. 



Hab. — Bass Strait, 45 fathoms. 



Colour yellowish white. Polypidom simply pinnate, 

 about 2i inches high ; pinnae in the middle | of an inch. 

 The cells are ventricose below, and almost flask-shaped. 



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