368 APPENDIX. 



remarkable elevation of the sharp margin surrounding the 

 upper half of the cell. In the looser aggregation, and in 

 the form of the cells, it shews the transition from Salicor- 

 naria to Cellular ia. 



Fam. 2. CELLULARIAD^. Cells disposed in the 

 same plane. 



10. Cellularia, Pallas. 



Char. (B.) Cells bi-triserial, oblong* or rhomboidal, 

 contiguous. Opening of cell occupying at least half of the 

 front. Margin thickened, sometimes spinous above. A 

 short spine or a sessile avicularium on the upper and outer 

 angle. 



A. inarmatcB — without avicularium. 



1. C. monotrypa. n. sp. 



Cells oblong, narrowed below, with a single perforation, 

 in the upper and outer part behind. Opening oval, mar- 

 gin smooth ; a short spinous process at the upper and outer 

 angle; a sharp short spine in the middle of the upper 

 border of the middle cell, at a bifurcation. Ovicell? in 

 fonn of a very shallow excavation in the upper part of the 

 cell in front. 



Hab. — Bass Strait, 45 fathoms. 



The only species with which this can be confounded, is 

 C. Peachii, (Busk. Annals. Nat. Hist. Vol. 7- 2nd Series, 

 p. 82.-P1. VIII. fig. 1.) 



The latter, however, is very much smaller, the cells nar- 

 rower in proportion to their length, and the margin of the 

 opening minutely verrucose. The cell has more than one 

 posterior perforation ; and the central cell at a bifurcation 

 is rounded above and without a spinous process ; lastly, the 

 ovicell is much loftier and tesselated on the surface. 



" This shape of the cells is given from the back view of them. 



Digitized by Microsoft® 



