CONCHOLOGY. 
92. Spirula. Shell rolled into a disk-like spire 
at the smaller extremity, the volutions not attached 
to each other; the larger one straight and 
cylindrical. 
Includes the Nautilus Spirula. Turton’s Conch. 
Dict. plate 77. A number of these most rare and 
interesting shells were cast on the Teignmouth 
beach in the winter of 1826, accompanied by the 
Tanthina in the living state, 
