362 



SHELLS AND SHELL-FISH. 



PART II. 



Vermetus. Shell tubular, contorted ; the terminal 

 whorls spiral. 



G. lumbricalis. Sow. Man. f. 345. 



Vermillia Lam. The terminal whorls not spiral. 

 V. triquetra. Sow. Man. f. 7. 



Siliquaria Brug. Terminal whorls spiral ; a narrow 

 punctured fissure on one side of the shell. 

 S. anguina. Sow. Man. f. 1. 



Tribe 2. MACROTRACHI^. 



Animal with one or two long respiratory siphons^ either 

 distinct or united ; the margins often furnished with 

 little teeth. 



Family 1. PHOLID^. 



Shell bivalve, sedentary, generally perforating, opening 

 at one or both ends ; the valves often prolonged into a 

 shelly tube, sometimes of great length : representing the 

 Tubulibranchia. 



11-1 



Aspergillium. Animal living in sand, and not fixed 

 on or upon any other substance : inhabiting a calca- 

 reous tube. 



Aspergillium Lam. Shell tubular, nearly straight, one 



