AN OUTLINE OF THE GEOGRAPHICAL DISTRIBUTION OF MOLLUSCA. Cephalopoda (p. 505)--Gasteropoda (p. 507)--Pulmonifera (p. 512)--General Observations on the Distribution of Land Mollusca (p. 522)--Pteropoda (p. 531)--Brachiopoda (p. 532)--Conchifera (p. 533)--General Remarks on the Distribution of Marine Mollusca (p. 537) 504-539