APPENDIX. 



PART I.— NAl URAL HISTORY. 



§ 1. ZOOLOGY, BY Thomas Say. 



A. CLASS POLYPI— ORDER VAGINATL 



CHONEMBLEMA. 



Generic Characters. 



POLYPIFER simple, lapideous, forming a somewhat 

 irregular mass, and composed of parallel tubes. Each tube 

 contains a series of inserted, infundibuliform diaphragms, 

 constituting a continued siphuncle, which occasionally in- 

 osculates, through the parietes of the tube, with the si- 

 phuncles of the proximate tubes. 



Observations. 



By the general character of this interesting fossil, it 

 might seem to be, in some degree at least, allied to the 

 genus Favosites of Lamarck, but it is widely distinguish- 

 ed by the extraordinary conformation of the interior of the 

 numerous tubes of which it is composed. The diaphragms, 

 vmlike those of Favosites, may be compared to a series of 

 funnels inserted into each other and connected together by 

 their siphuncular terminations, their superior peripheries 

 being so expanded as to join the inner walls of the tube, 

 thus interrupting the caliber of the latter into numerous 



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