374 APPENDIX. 



Hab. — Bass Strait, 45 fathoms. 



This species is at once recognisable by the remarkable 

 form and mnisual position of the avicularinm, and also by 

 the peculiar digitiform spiniferous process on the outer side 

 of the opening. 



2. B. gracilis, n. sp. 



Cells elongated, slender, opening round or suboval, look- 

 ing obliquely forwards and upwards ; three marginal (some- 

 times slightly submarginal) spines above and behind the 

 opening, and two much longer curved hair-like spines 

 arising from the anterior and lower edge of the opening. 

 OviceUs globose, subpedunculate, attached to the upper 

 and inner part of the margin of the opening. Avicularia 

 small, like bird's heads. 



Hab. — Bass Strait. 



A delicate slender species, not unlike B. ciliata or 

 avicularis in habit. The two long spines arising from the 

 anterior edge of the opening suffice to distinguish it from 

 the former of these two species. 



3. B. grandis, n. sp. 



Cells much elongated outwards, horizontal or projecting 

 portion oblong, rounded at the extremity; 2 — 5 long 

 cui^red submarginal spines, externally a single dorsal spine 

 about half way down the cell; opening oval, narrower 

 outwards ; very oblique mouth at the outer end. Avicu- 

 laria — ? 



Hab. — Bass Strait, 45 fathoms. 



Quite distinct from B. ciliata not only ia its size, which 

 is nearly three times as great, but in the form of the cell 

 and the opening. The number of spines varies very much, 

 and two or three of them, not unfrequently, arise from a 

 common projecting process or base. 



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