118 DIMYARIA. CLAVAGELLA 
margin; anterior side very short; valves attached by a 
ligament, and situate in the lower part of a testaceous tube, 
which is closed at the lower or anterior extremity, and to 
which they are confined by the septum, and open at the 
centre; the posterior end attenuated and open. 
Fistulana pyriformis, Plate X. figs. 17, 18. 
We exclude all the Lamarckian species of Fistulane except Fistulana 
Clava, which is the type. F. Lagenula, Appularia, and Pyrum, are Gas- 
trochena. F. cornifornus is a Teredo, and F. gregata is a Teredina. 
Distinguished from the Gastrochena by the oblong shape of the valves and 
straightness of the tube. 
The Fistulane are marine shells, and are fewinnumber. Fossil species are 
also few, and occur in the Calcaire-grossier. 
Genus LIX. — CLA VAGELLA. — Lamarck. 
Generic Character.— Shell consisting of a testaceous 
tube, somewhat attenuated, and open at its anterior 
extremity, irregularly ovate, subcompressed, claviform, and 
closed at its lower end, excepting by a number of irregularly 
formed minute tubes ; clavate termination provided with an 
irregular, thin, flattened, pearly adherent valve, on one 
side ; with a loose, extremely thin valve at the bottom of 
the tube, which is supposed to be united to the fixed valve 
by a ligament in a living state; an irregular muscular im- 
pression near one side. 
The tube of the Clavagelle is sometimes free, and at 
others it lines submarine bodies, such as madrepores, stones, 
and clay. 
Clavagella Coronata. Plate X. fig. 26. 
The shells of this genus inhabit the ocean ; and they have been met with in 
a fossil condition in the London Clay, and in the supercretaceous rocks of 
Bordeaux. 
