APPENDIX. 351 



3. Idmonea, LamoiirouT, 



1. /. radians, M. Edwards. Ann. de Sc. N. torn. 9, p. 

 25, PI. 12, fig. 4. 



Retepora radians, Lamarck. 



Hab. — Bass Strait, 45 fathoms. 



One minute specimen, but very perfect, has been ex- 

 amined; but it is undoubtedly the one described and 

 figured by M. Edwards, and noticed by Lamarck as 

 inhabiting the seas of New Holland. M. Edwards^ doubt 

 therefore as to this locality is now removed. 



Earn. 2. CRISIAD.E. 



4. Crista, Lamonronx. 



1. C. denticulata, Fleming. 

 Hab. — Bass Strait, 45 fathoms. 



Parasitic upon a species of Salicornaria. The only 

 difference, if there be any, between this form and the 

 British, consists in the rather greater projection or freedom 

 of the extremities of the cells, which are curved towards 

 the front. 



2. C. acropora, n. sp. 



Cells 9 to 13 in each mternode ; lateral branches given 

 off between the 1st and 2nd, or between the 2nd and 3rd 

 cells above a joint. A small conical tooth, sometimes 

 bifid, above and behind the mouth. 



Hab. — Bass Strait, 45 fathoms. 



A small parasitic species, distinguished from C. denti- 

 culata, which it much resembles, by the less average number 

 of cells in each internode, and the less number intervening 

 between the origin of a branch and the joint below it, and 

 by the small conical tooth or tubercle above and behind, 

 or to the outer side of the mouth. 



