Purple-Shells. 



(1) Murex trunculus, L. \. 



(2) Purpura hcemastoma. Lam. \. 



(3) Murex branderis, L. J (after Reeve). 



(4) Triton tritonis, L. \, showing blow-hole on side, of spire. 



(5) Turbinella pyrum, L. (the Chank), J, showing blow-hole at apex of spire. 



(Front drawings by Mrs. Wilfrid Jackson . ) 



