CONCHOLOGY. 35 



FAMILY I. 

 TuBicoLA. Six Genera. 



1. Genus ^spergillum. PI. V. 



Animal. Entirely unknown. 



Shell. Oval, somewhat elongated, striated longitudinally, conic, 

 club-shaped, having two valves incrusted on one side of the club, 

 open at its attenuated extremity, and terminated at the other by 

 a convex disk, pierced by a number of small perforations, and 

 encircled by a dilated margin of papyraceous tubes, resembling a 

 plaited ruff— smaller extremity always open. This is a well 

 known, but rare shell, found in sandy places in low water in the 

 Indian ocean. Four species. 



Aspergillum Javanum. Aspergillum Novse Zaelandise. 



A. vaginiferum. A. agglutinans. 



2. Genus Clavagella. PI. VI. 



Animal. Unknown. 



Shell. A tubular sheath, testaceous, attenuated, and open before ; 



terminating posteriorly in an oval, sub-compressed club, roughened 



by spiniform tubes — one valve fixed in the side of the club, the 



other free in the tube. Inhabits the Indian seas. Four species. 



Clavagella aperta. Clavagella tibialis. 



C. cristata. C Brocchii. 



3. Genus Fistulana. PI. VI. 



Animal. Provided with two protuberant calcareous tubes, 

 covering parts of its body at the open end of the tube, each of 

 which is terminated with from five to eight cup-shaped calcareous 

 or corneous appendages. It inhabits the sand, and perforates 

 wood, stones, and sometimes shells. 



Shell. Lamarck asserts that the tube and shell of this genus 

 are quite distinct. They have the shell free and detached within 

 the sheath, and neither of the valves fixed into the partition of the 

 tube, which is most generally testaceous, closed, and retort-shaped 



