228 CARLOTTA J. MAURY 
furnished of a considerable number of migrations since Mid- 
Tertiary time from the shallows to the depths, and an illustration 
is given of one mode of derivation of the abyssal faunas. ! 
The vanished land of ‘‘Antillia” delights the imagination. It 
has taken form under the bold and able pen of Bailey Willis, who 
represents it as at one time joined to Yucatan and at another to 
Florida. Investigations of the fossil invertebrates and comparisons 
of the land molluscs of Central America with those of Santo 
Domingo may give more probability to this ancient land. At 
present we only know definitely that the fossil fauna of the Yaqui 
Valley of Santo Domingo is most closely allied to that of Bowden, 
Jamaica, and also has affinities with the island faunas of Cumana, 
Trinidad, and Martinique and with the Isthmian fauna of Gatun. 
