G. TIBIANA. 97 



stems, as well as those of the branches, are fistular, 

 without articulation or division. The principal 

 branches, as in the Tubularias, appear to have no 

 communication with one another ; so that each tube 

 seems to inclose a family isolated from those of the 

 other branches when the polypus is multifarious, and a 

 single animal when the tubes have but one opening. 



The siilxstance of the Tibianas appears horny, 

 rather brittle than flexible, and sometimes slightly 

 cretaceous. 



Their colour is a brown fawn, more or less deep, or 

 whitish. 



Their height varies from one to two decimetres. 



I believe them to be indigenous to the East Indies 

 or Australasia. 



FASCICULATED. 



1. Tib I ANA fasciculata. Branches in zig-zag, the 

 thickness of a sparrow's quill ; polypean opening at 

 the side, alternate, placed at the extremity of each 

 angle, and sometimes directed to the base ; colour 

 brown fawn ; height a decimetre. — Plate 7. fig. 3. a. 



BRANCHING. 



2. TiBiANA ramosa. Stem the thickness of a goose- 

 quill ; branching at the extremity, flexuous, with thick 

 polypean tubercles scattered on it ; opening at the top, 

 or horizontal ; height from two to three decimetres ; 

 colour whitish. 



Australasia. 



Cor. N 



