114 HISTORY OF BRITISH ZOOPHYTES. 
Genus VI. TUBULARIA, Linneus. 
Gen. Char. Polypidom horny, fixed by a creeping fibre, erect, 
fistular, and unbranched, the tube filled with a semifluid me- 
dulla. Polypes placed at the extremities of the tubes, non- 
retractile, fleshy, furnished with two circles of filiform smooth 
tentacula, “‘ one row surrounds the middle of the heads, and the 
other is placed round the mouth;”’ bulbules clustered, shortly 
pedicled, placed within and at the base of the lower tentacula ; 
embryo sometimes in the form of a Beroé, sometimes of a Hydra. 
—Johnston.—The name from t¢udulus, a little pipe. 
1. Tusuraria inpivisa, L. Lhwyd*. (Plate I. fig. 3.) 
Hab. On shells and stones from deep. water; not rare. 
Rothesay Bay, Prof. EH. Forbes; Cumbraes, D. L. 
“ This,” says Ellis, “is the largest of this tribe of British 
tubulous corallines. It arises from small worm-like figures, 
which rise into distinct tubes five and six inches long, full 
of a thick reddish liquor. On the top of these the polypes 
appear with plumed crests. These tubes, in the dried spe- 
cimens, have the resemblance of oaten pipes, that is, part 
of an oaten straw with the joints cut off.” We may add, 
however, that they are clearer and more horny than oat- 
* Edward Lhwyd, or Lloyd, naturalist and antiquarian, born in Wales in 
1670, and died in 1709. 
