158 MANUAL OF THE MOLLUSCA. 



gether. Distr., 10 sp. W. Indies, W. Africa, Philippines, Australia, Pa 

 Panama. The chitonellse are found in fissures of coral rock (Cuming). 



Grypho-chiton, Gray. C. nervicanus. 



Helminthochiton, Salter, 1847. H. Griffithii, Salter Geol. Journ. Plate 

 sub-quadrate, not covered by the mantle ; apophyses widely separated. Fossil. 

 Silurian. Ireland. 



T, BLOOMSBURY. 



