352 APPENDIX. 



Suborder II. CHEILOSTOMATA. 



§ 1. Uniserialaria. Cells disposed in a simple series. 



Fam. 1 . CATENICELLID^. Cells connected by flexible 



joints. 



5. CATENICELLA, M. Edwards, (Lamarck, An. s. 



Vert. t. ii, p. 181.) 



Cells arising one from the upper and back part of ano- 

 ther by a sbort corneous tube, and disposed in a linear 

 series, all facing the same way, and forming dicbotomously 

 divided branches of a phytoid polyzoary ; cells geminate at 

 the bifurcation of the branches ; each cell furnished with 

 two lateral processes usually supporting an a^dcularium. 

 Ovicells either subglobose and terminal, or galeriform and 

 placed below the mouth of a cell in front. 



This interesting and important genus may be regarded as 

 characteristic, not only of the present collection, but perhaps 

 also of the Australian seas, as far as the Polyzoa are con- 

 cerned. Thirteen species are here described, and as it has 

 been found extremely difficult in most cases to identify 

 any of them with the very few hitherto noticed forms, the 

 synonyms given must be regarded as at least extremely 

 doubtful. 



Each cell arises from the upper and back part of another, 

 with the intervention of a short corneous tube which is 

 prolonged from the interior of one cell to that of the one 

 above. The cell is furnished on each side at the top with an 

 usually well-developed avicularium, in some species of huge 

 size, and in some very minute, or entirely aborted. This 

 avicularian process in most cases supports above a hollow 

 process, which is sometimes closed and more or less elon- 

 gated, constituting a conical or acerose spine, sometimes 

 open above and assuming the form of a shallow cup or re- 

 ceptacle. In some species both modifications of this 

 portion of the lateral process are met with in the same 

 specimen. This form of spine or cvip — as the case may 



