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 substance 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. Tibi an A 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 
