ANALYTICAL SEARCH FOR METALS IN TORTUGAS 



MARINE ORGANISMS. 



By Alexander H. Phillips. 



This is the second instalment of analyses of marine organisms 

 collected at the Tortugas. The first was printed in the report of the 

 Carnegie Institution of Washington for 1917, where also the general 

 method of analyses was described. Owing to the smaller amounts of 

 both copper and zinc in these specimens, the method was modified and 

 the copper was determined by the ferrocyanidecolorimetric method, 

 and zinc was determined by the terbidimetric method described by 

 Victor Berckner/ 



Specimen. 



Name. 



Weight 

 fresh. 



No. 

 614-0.... 



614-S 



614-T 



614-U.... 

 614-A-B.. 

 614-A-R.. 

 614-Q.... 

 614-B-H. . 

 614-A-W . 

 614-W. . . 

 614-C-A.. 

 614-A-C.. 

 614-A-E.. 

 614-A-D. . 

 614-B-W . 

 614-B-A 

 614-C. . . . 

 614-B-F. . 

 614-A-lt 

 614-A-2t. 

 614-AA-2. 

 620-a-4... 

 615-A-l . . 



Plexaura homomala 



Gorgonia flabellum 



Pseudoplexaura crassa. . . 



Plexaura flexuosa 



Eunicea crassa 



Eunicea rissoae 



Briarium 



Xiphigorgonia amceps. . . 



Gorgonia acerosa 



Bryozoa 



Toxopneustes 



Mellita 



Clypeaster 



Ciypeaster 



Diadema 



Astrospecten 



Cassiopea xamachana . . . 



Pentaceras 



Holothuria bermudiana. . 

 Holothuria bermudiana. . 



Loggerhead sponge 



Unio 



Mud from Marquesas.Fla. 



gms. 



1055 

 550 



1205 

 400 

 110 

 560 



1235 

 445 

 480 



1205 

 1345 

 1955 

 * 



255 



10370 



1175 



1945 



725 



3623 



* Not weighed. 



t Composed of the body walls, muscles, etc. 



J Composed of organs and intestine only. 



The weight of the sample taken for the determination of copper and 

 zinc was in each case 20 grams of the material, dried at 110° C. to 



' Jour. Bio. Chem. Soc, June 1919. 

 97 



