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Mr. E. Ray Lankester on Hcemoglobin. [Dec. 12, 



cavernous structure in others, and its consequent close association with 

 the Haemoglobin of the blood, this does not seem remarkable. I have not 

 attempted thoroughly to remove the blood from the heart by injection of 

 salt-solution, as was done by Kuhne with the voluntary muscular tissue 

 of Mammals. 



The facts ascertained as to the distribution of Haemoglobin may now be 

 summarized as follows : — 



1. In special corpuscles. 



a. In the blood of all vertebrates, excepting Leptocephahbs and 

 Amphioccus (?). 



b. In the perivisceral fluid of some species of the Vermian genera 

 Glycera, Capitella, and Phoronis. ' 



c. In the blood of the Lamellibranchiate Mollusk Solen legumen. 



2. Diffused in a vascular or ambient liquid. 



a. In the peculiar vascular system of the Chsetopodous Annelids 

 very generally, but with apparently arbitrary exceptions. 



b. In the vascular system (which represents a reduced peri- 

 visceral cavity) of certain leeches, but not of all {Nephelis, Hirudo). 



c. In the vascular system of certain Turbellarians as an exception 

 (Polia). 



d. In a special vascular system (distinct from the general blood- 

 system) of a marine parasitic Crustacean (undescribed) observed by 

 Professor Edouard van Beneden. 



e. In the general blood-system of the larva of the Dipterous insect 

 Cheironomus. 



f. In the general blood-system of the pulmonate mollusk Pla- 

 norbis. 



g. In the general blood-system of the Crustaceans Daphnia and 

 Clieiroceplialus. 



3. Diffused in the substance of muscular tissue. 



a. In the voluntary muscles generally of Mammalia, and probably 

 of birds, and in some muscles of reptiles. 



b. In the muscles of the dorsal fin of the fish Hippocampus, being 

 generally absent from the voluntary muscular tissue of fish. 



c. In the muscular tissue of the heart of Vertebrata generally. 



d. In the unstriped muscular tissue of the rectum of man, being 

 absent from the unstriped muscular tissue of the alimentary canal 

 generally. 



e. In the muscles of the pharynx and odontophor of Grasteropodous 

 Mollusks (observed in Lymnceus, Paludina, Littorina, Patella, Chiton, 

 Aplysia), and of the pharyngeal gizzard of Aplysia, being entirely 

 absent from the rest of the muscular and other tissues and the blood 

 of these mollusks. See as to Planorbis above (2/). 



/. In the muscular tissue of the great pharyngeal tube of Aphro- 



