ii6 



REPORTS OF INVESTIGATIONS AND PROJECTS. 



Comparative Results of the Examination of Individuals of the Same Species for 

 Distomes in 1906 and 1907. 



1 Hsemulon flavolineatum in igo6 report. 

 - Hsemulon sciurus in iqo6 report. 



^ Iridio kirschii in 1906 report. 



< Chsetodipterus faber in 1906 report. 



Two specimens of the loggerhead turtle {Thalassoehelys earetta) were 

 examined. From them 3 species of nematodes and 3 species of trematodes 

 were secured, which were not seen in this host last year. In the mouth of 

 one of these turtles numerous specimens of a species of Branchiohdella were 

 found, and in the mouth of the other many barnacles. They were firmly 

 attached to the floor and roof of the mouth and at the beginning of the gullet. 



The alimentary canal of a man-o'-war bird (Fregata aqtiila) was brought 

 to the laboratory by Prof. J. B. Watson. Three specimens of an ascarid 

 were found in the stomach and many specimens of a cestode were found in 

 the intestine. 



Prof. Jacob Reighard continued his studies of 1905 upon the subject of 

 warning coloration in reef fishes. Naturalists have commonly assumed that 

 the small, brilliantly colored fishes that haunt the crevices of the coral reefs 

 are probably warning-colored, and are distasteful to the predatory fishes of 

 the reefs. Professor Reighard has clearly demonstrated that such is not the 

 case, for these conspicuously and beautifully colored fishes are readily 

 devoured by the commonest predatory fish of the reef, the gray snapper, 

 whenever they are removed from the protection of the coral-heads. Pro- 

 fessor Reighard proved, nevertheless, that the gray snapper could be taught 

 to associate an evil taste with conspicuous color in artificially dyed and poi- 

 soned fishes, and that they would "remember" to avoid such fishes even 20 days 

 after their evil experience. It is thus evident that while "warning coloration" 

 is a possibility, none of the brilliantly colored reef fishes which Dr. Reighard 

 experimented with are warningly colored. 



