Kurnus. 12.5 



Genus KUPHUS, Guettard. 



Stn. Furcella, Oken. Serpula gigantea, Liun. Seijtaria, 



Lamarck. 



Molluscum arenicolum, tubam testaceam formans. Tuba 

 ad terminum posticum dimidiatim divisa. Palmulse tes- 

 tacece deltoides. — The tube of this sand-burrowing Mollusc 

 attains the length of some feet, and has been known as the 

 gigantic 8eptaria of Lamarck. The small end, which pro- 

 trudes from the surfoce of the sand, is divided by a central 

 septum, and sometimes forms a double separated tube. The 

 pallets of the larger species only are known ; they are spa- 

 thulate and deltoid. No valves have been found of either 

 species. 



L GiGANTEUS, f. 20, Lhincbus. — As described generically 

 above. 



2. CLAUSUS, f. 21, Soiverhy. — Tuba brevior, ad terminum 

 anticum clausa. Valvoe ignotae. — The smaller tube in the 

 British Museum may possibly be, as there designated, a 

 young specimen of the gigantea. But it seems hardly 

 likely, the tube when young should be closed with over- 

 lapping extensions of the edges, and then be reopened on 

 further development. 



