﻿46 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 78 



of them was placed a specimen of Cerion incannm and of Cerion 

 viarcgis. It is hoped that these plantings will at last furnish the much 

 desired cross of individual pairs. 



All the colonies of Bahama Cerions are doing well and spread- 

 ing rapidly beyond' their original areas, excepting the one from San 

 Salvador, planted two years ago, in which considerable mortality has 

 occurred. The colony of Cerion uva from Curacoa, however, is about 

 gone and Ccrloii crassilahrc from Porto Rico will probably not 

 survive. 



Fig. 48. — A photograph of the north end of Loggerhead Key from the 

 lighthouse, showing the location of many Cerion colonies. 



On August 25 Dr. Bartsch visited Newfound Harbor Key, where 

 he found the h^'brid colon\- of Cerion incannm and Cerion viaregis 

 doing well. One hundred specimens, showing great diversity in size, 

 sculpture, and coloring, were gathered for dissection at Washington, 

 and it is to be hoped that the dissection of 70 more of these hybrids 

 may soon be finished, 30 having already been completed, so that a 

 report based on 100 dissections may be published. The 30 specimens 

 already dissected show an enormous diversity and modification of the 

 internal anatomy from the types planted, produced by hybridization. 



During his stay at the Tortugas, Dr. Bartsch kept a record of the 

 birds from day to day. This w^as also done on the other Keys visited. 

 He likewise exposed sixteen hundred feet of moving picture film 

 under sea, which he hopes will show some of the faunal associations 

 found on the coral reefs at the Tortugas. 



